In order to constrain the tectonic evolution of the eastern part of the Jiao-Liao-Ji Orogenic Belt,the authors carried out a study on the petrogenesis and diagenetic tectonic background of the metamorphic gabbrocarbonatite complex in the Daxing iron mining area by using petrology, petrochemistry, petrogeochemistry and zircon U-Pb dating.The results show that the metamorphic gabbro-carbonatite complex in the Daxing iron mining area has the rock types of meta-gabbro, carbonatite and magnet ore body, and the mata-gabbro is the main rock type.Petrochemical study of the meta-gabbro showed that the w (SiO2) is from 44.23% to 48.80%, w (Na2O) is from 0.94% to 2.86%, w (K2O) is from 0.51% to 1.90%, w (TiO2) is from 0.42% to 0.93%, w (CaO) is from 8.73% to 14.78%, and the Na2O/ K2O ratio ranges from 1.12 to 2.27, MgO/ (FeO+MgO) ratio ranges from 0.54 to 0.60, (Mg2++Ni2+) / (Fe2++Fe3++Mn2+) ratio ranges from 1.44 to 2.02, Mg/ (Mg+Fe2+)ratio ranges from 0.60 to 0.68, and the differentiation index (DI) ranges from 11.76 to 31.79.The meta-gabbro rocks are basic-ultrabasic magma which is rich in iron and sodium, poor in potassium and titanium, and weak in differentiation.Geochemical studies show that the rocks are rich in large ion lithophile elements such as Rb, Ba [w (Rb) (4.80×10-6-74.82×10-6), w (Ba) (83.09×10-6-430.10×10-6)], and relatively rich in high field strength elements such as Hf, Th, Ta [w (Hf) (1.41×10-6-6.20×10-6), w (Th) (0.51×10-6-28.91×10-6),w (Ta) (0.47×10-6-9.91×10-6)], and ΣREE=(29.56×10-6-812.59×10-6 ); while, Nb is obviously depleted [ w (Nb) (2.94× 10-6-36.01× 10-6 ) ].The (Na2O+K2O) / TiO2 ratio is 0.10-5.54, Zr/ Y ratio is 1.93-5.67, La/ Nb ratio is 0.54-1.73, La/ Ta ratio is 5.53-11.13, Nb/ U ratio is 1.51-14.23.The geochemical characteristics are similar to continental tholeiitic basalts, and having the properties of intra-plate alkaline basalts.The carbonatite and meta-gabbro are interbedded.The average CaO/ (CaO+MgO+Fe2O3+FeO+MnO) ratio is 0.98, mean w (MgO) is 0.62, and mean w (FeO+Fe2O3+MnO) is 0.41.It is calcareous metamagnesic carbonatite which obviously rich in Sr [w (Sr) (1 727×10-6-1 794×10-6)].The complex magma may come from the partial melting of the asthenosphere enriched mantle, formed in the tectonic background of the stretching of the deep fault zone in the continental plate, and assimilated and mixed with crustal materials in a certain extent during the ascent.Most of the meta-gabbro zircons have the core-rim structure, the color of the core is mostly black.It is difficult to observe its internal structure, a few of the core can be seen wide oscillating bands.The Th/ U ratio is 0.23-4.19, which shows the characteristics of basic magmatic zircon.The weighted average age of 207Pb/ 206 Pb of the core is (2 098 ± 11) Ma (MSWD=1.2, n=18), which represents the condensation crystallization age of the gabbro.The color at the rims of the zircons is relatively light and uniform, without zonation,and the Th/ U ratio is 0.03-3.22, indicating metamorphic origin.The weighted average age of 207Pb/ 206Pb of the rims is (1 892 ±23) Ma (MSWD=2.2, n=14), which represents the metamorphic age of gabbro.Combined with regional geological data, it is considered that the eastern part of the Jiao-Liao-Ji Orogenic Belt was in a extensional tectonic environment in the Middle Paleoproterozoic, the formation of metamorphic gabbro-carbonatite complex in the Daxing iron mining area may be related to the extension during the tectonic evolution of the Songjiang-Chongshan fault zone.

To explore the geodynamic mechanisms of the large-scale magmatic activity during Early Cretaceous in Da Hinggan Ling (Mts.), the authors focused on diabase in Huoluotai area in northern segment of Erguna Block,Da Hinggan Ling (Mts.), through the study of petrogeochemical characteristics and zircon U-Pb dating of diabase in Huoluotai area, aimed to determine its formation age, petrogenesis, and tectonic setting.Zircon LA -ICP -MS U –Pb dating results show that the weighted average age of diabase in Huoluotai area is (135.1 ±3.6) Ma, indicating that the crystallization age of diabase is Early Cretaceous.Whole rock geochemical data reveal that diabase in Huoluotai area is characterized by low w (SiO2) (48.84%-52.11%), high w (MgO) (5.13%-6.85%) and w (Fe2O3) (7.45%-8.60%).The Eu anomaly of diabase is insignificant or exhibits a weak negative anomaly (δEu =0.83-1.06).The diabase is enriched in large ion lithophile elements (such as Ba, Sr, and K), and depleted in high field strength elements (such as Zr, Ta, Nb, and Th).Diabase in Huoluotai area is only minimally influenced by fractional crystallization, crustal contamination, and accumulation processes.The Nb/ Yb -Th/ Yb diagram shows that diabase in Huoluotai area falls within the area of primitive mafic melts derived from subduction-modified lithospheric mantle.The Th/ Nb-Ba/ Th and Th/ Yb-Ba/ La diagrams indicate that the magma source of diabase in Huoluotai area was modified by fluids derived from subducted slabs.The La/ Nb-La/ Ba diagram reveals that the magma source of diabase in Huoluotai area is from the lithospheric mantle.The above geochemical characteristics indicate that diabase in Huoluotai area originated from a lithospheric mantle source metasomatized by fluids derived from subducted slabs.Combined with previous research, it is concluded that the formation of diabase in Huoluotai area in northern segment of Erguna Block, Da Hinggan Ling (Mts.) is closely related to the rollback process of the Paleo-Pacific Plate.

The timing of the final closure of the Paleo-Asian Ocean is one of the controversial issues in the field of geoscience.The central Jilin Province, which was controlled by the evolution of the Paleo-Asian tectonic regime during the Paleozoic, is an ideal place to resolve the above issue.The authors conducted systematic zircon U-Pb geochronological and geochemical studies on lithic sandstones and silty slates from Yangjiagou Formation in the Dakouqin area, central Jilin Province, and determined the deposition time and provenance characteristics of Yangjiagou Formation.The maximum depositional age of the formation can be constrained by the youngest weighted average age of detrital zircons, and therefore the lower depositional ages of the two lithic sandstones samples (PM001-38-TW1 and PM001-135-TW1) from Yangjiagou Formation were determined to be (255 ± 5) Ma and (251 ±2) Ma, which are consistent to the Permian and Triassic boundary (251.902 ±0.024) Ma.Combined with the ages of zircons that captured from the surrounding Late Triassic monzogranite dated (235-227) Ma, and the timing of the monzogranite aged (232 ±2) Ma which intruded in, the Yangjiagou Formation in the study area would deposit during the Late Permian.Whole rock major and trace element geochemical data of the lithic sandstones and silty slates from Yangjiagou Formation indicate that w (SiO2) ranges from 65.13% to 70.73%, w (Al2O3) form 14.75% to 17.29%, w (K2O) form 2.43% to 3.87%, w (Na2O) form 1.59% to 3.26%, and the ratio of K2O/ Na2O is from 0.75 to 2.34.The light rare earth elements are relatively enriched, while the heavy rare earth elements are depleted, with LREE/ HREE and Eu/ Eu∗ ratios of 6.98-9.09 and 0.56-0.70, respectively.Based on the CIA-ICV diagram, the source composition discrimination diagram and the tectonic setting discrimination diagram, the sedimentary provenance of Yangjiagou Formation has experienced a relatively moderate weathering with a high maturity.The Yangjiagou Formation whose source rocks are mainly felsic, were deposited in active continental margin or continental island arc.Detrital zircon age distributions of Yangjiagou Formation can be divided into five groups: Paleoproterozoic (1 819- 1 785 Ma), Meso-Neoproterozoic (1 491-561 Ma), Cambrian-Carboniferous (522-301 Ma), Early and Middle Permian (295-259 Ma), and Late Permian to Middle Triassic (258-238 Ma).Based on previous studies of regional magmatism, Yangjiagou Formation has bidirectional provenance characteristics (North China Plate and Xing􀆳an-Mongolian Orogenic Belt).The provenance attribute and paleontological evidence of Yangjiagou Formation show a tectonic transition from collisional orogeny to a stable tectonic environment.Combined with the characteristics of magmatism in the study area, the final closure of the Paleo-Asian Ocean in central Jilin Province is considered to happen in the Late Permian-Middle Triassic.

Songliao Basin is one of the main basins for unconventional oil and gas exploration and development in China.The 1st and the lower part of the 2nd members of the Upper Cretaceous Qingshankou Formation are key focus layers for shale oil exploration.The research on the unclear sedimentary facies division and distribution issues of these layers in Changling Sag is beneficial for providing geological basis for shale oil exploration and selection in study area.Based on the drilling core, logging, and geochemical data of the 1st and the lower part of the 2nd members of the Qingshankou Formation in the Changling Sag of the Songliao Basin, and combining with the research results of the previous researchers, this paper conducts a detailed study of the sedimentary facies of the target layers in the study area from the aspects of lithofacies, sedimentary structure, and logging.The target strata in study area are divided into two sedimentary facies, the lake and delta facies, and four sedimentary subfacies including delta front, front delta subfacies, semi-deep lake and deep-lake subfacies.Among them, the front delta and semi-deep lake subfacies are advantageous sedimentary facies for shale oil exploration and development.The transgressive systems tract mainly develops delta front and front delta subfacies.Vertically, the two subfacies gradually slow down from bottom to top.Horizontally, the two subfacies gradually decrease towards the edge of the basin.The high water level systems tract mainly develops semi-deep lakes and deep-lake subfacies.Vertically, the two subfacies have a large thickness.Horizontally, the two subfacies extend to the center of the basin.The regressive systems tract mainly develops delta front, front delta, and semi-deep lake subfacies.Vertically, the semi-deep lake subfacies gradually slow down from bottom to top, while the thickness of the delta front and front delta subfacies gradually expands.Horizontally, the semi-deep lake subfacies decrease towards the center of the basin, while the delta front and front delta subfacies gradually extend towards the center of the basin.The dominant sedimentary facies zones mainly develop in late transgressive system tract and early regressive system tract.

In order to investigate the diversity and complexity of sedimentary reservoirs, to clarify the sedimentary characteristics and sand body development rules of the Cretaceous Shushanhe Formation (K1s) in Tahe Oilfield, Tarim Basin, and to analyze the relationship between sedimentary microfacies and reservoir sand body distribution,core analysis and logging analysis methods were used to identify lithological markers, mainly including rock color,composition, sedimentary texture, sedimentary structure, rock type and lithological associations, and to identify logging markers, including qualitative logging curve characteristics and quantitative logging data characteristics.Adopting systematic sedimentological analysis methods, mainly geological methods, the authors summarized lithology and logging sedimentary facies markers, and established sedimentary microfacies classification standards, and analyzed sedimentary facies types and their evolutionary characteristics vertically and on the profile through the study of single-well facies and profile facies.We also analyzed the plane characteristics of sedimentary microfacies by using ratio of sand to stratum, and the distribution pattern of sandstone in the region by using thickness of sand body.Based on the core and logging data, a sedimentary microfacies division standard was established, one singlewell sedimentary facies diagram and two horizontal and vertical profile facies diagrams were drawn; while the sedimentary microfacies plane and sand body distribution of four small layers were completed, and the regional braided river delta front sedimentary model was summarized.The Upper Member of Shushanhe Formation (K1s3) in TP12 -8 well area belongs to the shallow water gentle slope braided river delta front sedimentation system, which identifies three sedimentary microfacies of the subaqueous distributary channel, the subaqueous interdistributary channel and the channel edge, and the provenances come from the southern area of Tuofutai.Because the sedimentary environment is a large oxidized wide shallow lake basin, it has unique sedimentary characteristics.Different from the general subaqueous deposition, the color of sediments in the TP12-8 well area is oxidized, such as brown.Sand body is stacking developed, mainly fine sandstone, accounting for about 75% of the total area on the plane, and the thickness of the sand body can reach 1.4-23.9 m.The subaqueous distributary channel is the main sedimentary face in the study area, and the mouth bar does not develop.After the channel enters the lake, it continues to extend,running through the whole study area in a strip shape, with a width of 1.5-9.0 km.

 In order to explore the distribution of high quality reservoirs within the Cretaceous volcanic edifice in the M region in the eastern uplift zone of the Santos Basin, Brazil, volcanic lithology, lithofacies, stages, types of edifice and their relationship with reservoirs were studied in the Cretaceous volcanic strata in the M region, based on the drilling cores, conventional logging curves, three-dimensional seismic data and logging physical properties,with the methods of volcanic petrology and volcanic stratigraphy.The results show that four types of volcanic edifice were identified in the M region, including onshore basaltic tabular lava edifice, onshore basaltic fill-type lava edifice, subaqueous basaltic thick-layer lava edifice, and subaqueous basaltic compound lava edifice.Furthermore, the volcanic rocks in the M region were divided into five eruption stages, of which eruption stage 2 (E2) is characterized by the deposition of onshore basaltic tabular lava edifice, stage 3 (E3) consists of the subaqueous basaltic thick-layer lava edifice and subaqueous basaltic compound lava edifice, stage 4 (E4) comprises merely subaqueous basaltic compound lava edifice, and stage 5 (E5) is composed of onshore basaltic fill-type lava edifice.Additionally, the reservoir physical properties vary among four types of volcanic edifices, with the subaqueous basaltic compound lava edifice exhibiting the best properties, subaqueous basaltic thick-layer lava edifice being moderate, and the onshore basaltic tabular lava edifice and onshore basaltic fill-type lava edifice demonstrating the worst properties.Based on these findings, it is considered that in the M region, the reservoir associated with E4 featuring subaqueous basaltic compound lava edifice is the best, the reservoir of E3 comprising subaqueous basaltic thick-layer lava edifice and subaqueous basaltic compound lava edifice ranks second, the reservoirs of E2 and E5 which involve onshore basaltic tabular lava edifice and onshore basaltic fill-type lava edifice are considered the least favorable.Therefore,volcanic rocks from E3 and E4 can be targeted as key areas for subsequent oil and gas exploration in the study area.

 The Chaganhua Subsag, one of the subsags in the Changling Fault Depression, Songliao Basin, is divided into two parts: the northern and the southern. The spatial relationships between the source rocks and reservoir rocks and the interstitial physical properties of the volcanic rock hydrocarbon reservoirs are similar in the northern and southern parts. However, exploration and development reveal that the distribution and activity periods of the faults in the southern and northern parts of the subsag are different, and volcanic rock hydrocarbon reservoirs in the northern part of the subsag are more than those in the southern part. In this study, seismic interpretation data were used to statistically analyze the occurrence and activity period of the main active faults in the Chaganhua Subsag,2D hydrocarbon accumulation simulations were processed with key well-crossing profiles on the basis of the source rock burial history. The matching relationships between the activity periods of the main active faults and the hydrocarbon charging periods in the southern and northern parts of the Chaganhua Subsag were compared. The controlling effects of fault activity on hydrocarbon migration and accumulation, and the causes of the differences in the distributions of volcanic rock reservoirs in the northern and southern parts of the subsag were analyzed. The results revealed two hydrocarbon charging periods of volcanic reservoir in the Chaganhua Subsag. One period was the Early Cretaceous Denglouku stage, and the other was from the end of the Early Cretaceous Quantou stage to the Late Cretaceous Qingshankou stage. Three levels of faults were developed in the Mesozoic strata under an extensional structural environment. The secondary faults were the important factors in hydrocarbon migration and accumulation.Many secondary faults developed with long activity period in the northern part of the Chaganhua Subsag. Their activity period was as long as from the Early Cretaceous Huoshiling stage to the end of the Quantou stage or even to the end of the Late Cretaceous Qingshankou stage. The hydrocarbon charging period as well matched the fault activity period. The secondary faults in the northern part of the subsag performed the main migration paths, in the volcanic hydrocarbon accumulations under the coordinating of unconformities. In the southern part of the subsag,the secondary faults were less developed with short activity periods from the Early Cretaceous Shahezi stage to the Denglouku stage. These faults were bad for matching the hydrocarbon charging periods, and had little control effects on hydrocarbon accumulation in the southern part of the subsag, and played a limited role in hydrocarbon migration. Some of these faults with long activity periods could be beneficial for hydrocarbon migration with the assistance of advantageous volcanic facies belts. The fault activity periods and their matching relationships to hydrocarbon charging periods are the main reasons for the differences in volcanic rock hydrocarbon reservoirs between the southern and northern parts of the Chaganhua Subsag.

To analyze the petrological characteristics, grain size distribution characteristics, sedimentary facies types and spatial distribution regularity of the Lower Karamay Formation in Block Si 1, Karamay Oilfield, Well D16 is selected as the standard well in the study area, and its drilling cores are used as the main data source for observation and experiments. Core observation, rock mineral thin section identification and sieve analysis are used to obtain petrological data such as colors, lithologies, sedimentary structure and texture, rock mineral composition and contents, and grain size distribution statistics of the Lower Karamay Formation reservoir in Block Si 1. The sedimentary facies types of the Lower Karamay Formation in Block Si 1 are identified based on sedimentary facies markers such as core colors, lithologic assemblages, structure and texture, grain size probability accumulation curves, C-M diagram, and structural parameter scatter plots. At the same time, combined with the geophysical data of more than 100 wells in the study area, the method of well logging is used to radiate the sedimentary facies model of the D16 standard well to other wells in the study area. By pulling the well-connected profile, the distribution regularity of sedimentary microfacies and sand bodies on the profile are analyzed. According to the thickness contour map of sandstone, the distribution regularities of sedimentary microfacies and sand bodies on the plane are analyzed. The results show that the core colors of Well D16 are brown, light brown, light gray and gray-green, and the lithologies are divided into unequal-grained sandstone, medium-fine sandstone, argillaceous siltstone, silty mudstone and mudstone according to the grain size, and the sandstone is divided into lithic sandstone, feldspathic lithic sandstone and lithic feldspathic sandstone according to the rock mineral types. The roundness is sub-angular to sub-rounded, the sorting is medium to poor. Massive bedding and tabular cross-bedding are developed, the contact relationships of particles are mainly point-line contact, and the pores are mainly residual intergranular pores. The probability accumulation curves of grain size are two-stage or four-stage types, the C-M diagram has the characteristics of traction flow, and the points of the structural parameter scatter plots are concentrated in the delta plain and front interval. The sedimentary environment of the Lower Karamay Formation reservoir in Block Si 1 is shallow,weakly oxidized to weakly reduced. Two sedimentary subfacies, the braided river delta front and the shallow lake,and four sedimentary microfacies, including the subaqueous distributary channel, the subaqueous interdistributary,the estuarine dam and the coastal shallow lake mud, are identified. The main reservoir sand bodies of the Lower Karamay Formation are subaqueous distributary channel sand bodies, which are distributed in lens-shaped and layered forms on the cross section and in strip-shaped and sheet-shaped forms on the plane. 

To study imaging optimizing algorithms for low signal-noise rate (SNR) seismic data in irregular topography, an effective coherence constraint noise suppression method is established according to the obvious difference in coherence characteristics between noise and effective reflected signals, which can provide theoretical and technical support for practical applications of the imaging in irregular topography.In order to solve the problem of conventional imaging of low signal-to-noise ratio seismic data in irregular topography, a coherence constraint Gaussian beam migration method for irregular topography is proposed in this paper.The elevational correction of
time-shift eliminates the inaccuracy of beam decomposition caused by irregular topography.Horizontal projection equivalent discrete interval (HPEDI) for beam center and receiver location is designed to solve the drawback of unbalance of imaging amplitude.About the coherence constraint, a new stable complex domain weighted coherence spectrum computing method is proposed, and the threshold extraction and exponential strengthening methods for effective reflection signal are designed to achieve the effective suppression of random noise and incoherent false imaging.Numerical experiments of 2 synthetic data examples and 2 measured data examples are applied to validate the effectiveness of the proposed methods in noise and false image suppression.The proposed HPEDI method can achieve significant image optimization in amplitude equalization and arc false image suppression for the synthesized data in irregular topography.The coherence spectrum of real measured data verifies that the weighted coherence spectrum is smoother and more stable than the conventional coherence spectrum.Most of the arc false images of the synthesized data in a layered model are suppressed by using the threshold of coherence spectrum.The irregular real measured low signal-to-noise ratio data prove that the proposed coherence constraint method suppresses random noise obviously.The proposed coherence constraint migration imaging method can effectively suppress the noise and false imaging without coherence characteristics in the imaging process, and can significantly improve the imaging effect. 

As urbanization continues to accelerate, it is difficult to acquire real-time data on potential pavement collapse hazards utilizing traditional methods.At present, efficient monitor pavement collapse has become a key challenge in the field of pavement safety.For this problem, the authors propose a method which combines time-series InSAR with wavelet transform.This method analyzes the change cycle of the subsidence point to obtain the deformation information, and extract the temporal and spatial evolution characteristics of ground subsidence.For those areas with obvious spatial and temporal evolution characteristics, the accuracy of the InSAR results will be further verified by using the microtremor detection seismograph.We selected 52 Sentinel -1A images captured between March 2022 and November 2023 to obtain the surface subsidence results in the central urban area of Changchun by the time-series InSAR method.The results showed that the maximum deformation rate was -30.58 mm/ a, and the maximum cumulative subsidence was -73.3 mm in the study area.A detailed analysis of the representative deformation area, Nanhu avenue, revealed a maximum deformation rate of - 28.44 mm/ a, a maximum daily average deformation rate of -0.93 mm/ d, and a maximum cumulative subsidence of - 56.4 mm.The analysis of significant subsidence points based on wavelet transform uncovered their subsidence evolution processes.The development of surface subsidence in severely affected areas was influenced by multiple periodic variations of different magnitudes and levels, with nested local cycles within these periodic time scales that affect the specific trends of subsidence development.Using microtremor detection seismograph to collect data from regions with obvious evolutionary characteristics, the authors generated a geological profile of Nanhu avenue.According to the profile, significant subsidence points exhibited a phenomenon of slurry infiltration.This further validated the accuracy of the subsidence monitoring results.Finally, by comparing the actual pavement collapse incident in the Nanhu avenue metro construction area to the subsidence results monitored in this study, the feasibility and accuracy of the proposed method in practical applications were validated.

Geological hazard risk evaluation plays a significant guiding role in disaster prevention and mitigation.Focusing on the issues of frequent and severe geological hazards in Lüchun County, this study conducts a geological hazard risk evaluation to provide scientific support for disaster prevention planning and risk management in Lüchun County.Taking Lüchun County in Yunnan Province as the study area, grid unit is selected as the evaluation unit, and nine evaluation factors are chosen: elevation, slope, aspect, distance to faults, distance to rivers,engineering geological rock groups, geomorphological types, curvature, and land use types.Utilizing the spatial analysis function of geographic information system, the weighted information value model, which combines the information value model and the analytic hierarchy process, is applied to evaluate the susceptibility of collapse and landslide geological hazards in Lüchun County.The monthly average rainfall in Lüchun County is selected as the triggering factor for geological hazard evaluation of landslides and collapses in the study area.Three disaster bearing factors: population density, the number of threatened people, and land use types, are selected to complete the vulnerability evaluation.The hazard index and vulnerability index are multiplied then to produce the risk evaluation of collapse and landslide geological hazards.The results show that Lüchun County can be divided into four risk levels:low, medium, high and extremely high, which accounted for 12.84%, 46.01%, 38.28% and 2.87% of the county area, respectively.The low risk areas are mainly located in the middle of Banpo Township, the north of Qimaba Township, the north of Daxing Town and the south of Gekui Township.The middle risk areas are mainly distributed in the north of Daheishan Town, the west of Dashuigou Township, the middle and south of Qimaba Township, the middle of Gekui Township and the southwest of Pinghe Town.High and extremely high risk areas are mainly distributed around Lüchun County and Daxing Town, Niukong Town, Sanmeng Township, Pinghe Town,and the middle of Dashuigou Township.The results of geological hazards risk evaluation obtained in this paper are in good agreement with the actual investigation.

Rational development and utilization of cultivated land reserve resources are essential for ensuring China’s food security, while suitability evaluation is the prerequisite and foundation.By scientifically assessing the development suitability of these resources, it provides a scientific basis for rational allocation and sustainable utilization of regional land resources.The authors take Da’an City of Jilin Province as the study area and develop a comprehensive suitability evaluation system from natural, social, and ecological perspectives.Using methods such as AHP (analytic hierarchy process), landscape pattern indices, and composite indices, the authors conduct a systematic analysis to reveal quantity, quality, and spatial distribution characteristics of development suitability levels of cultivated land reserve resources in Da’an, and propose corresponding development and utilization strategies.The research results indicate that: the development suitability of cultivated land reserve resources in Da’an City can be categorized into four levels: highly suitable, moderately suitable, marginally suitable, and unsuitable, accounting for 26.64%, 38.83%, 25.08%, and 9.44% of total area of cultivated land reserve resources, respectively.Development suitability levels gradually decrease from central part of Da’an City toward northeast and southwest.Highly suitable and moderately suitable development areas are mainly concentrated in Xinping’an Town and Haituo Township, while unsuitable development areas are mainly concentrated in Longzhao Town in southwestern part of the city.Land use types are primarily saline-alkali land and other grasslands, accounting for 99.67% of total area of cultivated land reserve resources in city.The highly suitable development areas for saline-alkali land are distributed in northwest and southeast, while the highly suitable development areas for other grasslands are concentrated in the central and western parts.Spatial distribution of development suitability levels for cultivated land reserve resources in Da’an City shows significant variation, with moderately suitable development areas being the most prevalent.Development and utilization strategies for cultivated land reserve resources should be tailored to local conditions.Saline-alkali land development should focus on water resource management and soil salinization amelioration measures, while development of other grasslands should carefully control development intensity to maintain regional ecological balance.