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世界地质 2021, 40(2) 399-407 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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基础地质 |
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火山碎屑岩储层特征及其主控因素分析:以松辽盆地南部长岭断陷龙凤山地区为例 |
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郑健,王璞珺,朱建峰,边伟华,洪一鸣,程泽宇,季金礁 |
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1. 吉林大学地球科学学院,长春130061;
2. 中国石油化工股份有限公司东北油气分公司,长春130062 |
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摘要:
松辽盆地南部长岭断陷龙凤山地区火石岭组火山碎屑岩已被证实为有效油气储层。笔者选取研
究区6 口钻井中钻遇火石岭组火山碎屑岩代表性井段,通过岩芯观察、铸体薄片和扫描电镜分析、孔
隙度与渗透率测试等,探究火山碎屑岩储层孔隙的发育特征和主控因素。结果表明,研究区内火石岭
组火山碎屑岩主要为安山质火山碎屑岩及火山碎屑熔岩,岩相以爆发相空落亚相为主; 凝灰质胶结火
山角砾岩的孔隙度界于3. 86% ~ 8. 76% 之间,平均渗透率为0. 397 × 10 - 3μm2,储集性能最优。在后
期成岩作用过程中,充填作用破坏了绝大部分原生孔隙,溶蚀和构造作用形成的次生孔缝构成了现今
有效孔隙的主体,有效孔隙组合以网状微裂缝+ 溶蚀微孔为主。 |
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关键词:
松辽盆地南部
长岭断陷
龙凤山地区
火石岭组
火山碎屑岩
成岩作用
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Characteristics and main controlling factors of pyroclastic reservoirs:
a case study in Longfengshan area,Changling fault depression,southern Songliao Basin |
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ZHENG Jian,WANG Pu-jun,ZHU Jian-feng,BIAN Wei-hua,HONG Yi-ming,CHENG Ze-yu,JI Jin-jiao |
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1. College of Earth Sciences,Jilin University,Changchun 130061,China;
2. SINOPEC Northeast Company,Changchun 130062,China |
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Abstract:
The pyroclastic rocks of the Huoshiling Formation have been proven as effective hydrocarbon reservoirs
in the Longfengshan area,Changling fault depression,southern Songliao Basin. In this paper,the features and
controlling factors of reservoir spaces have been analyzed based on the typical sections of the pyroclastic rocks of six
wells from the Huoshiling Formation. Based on the results of drilling core observation,blue-dye thin section and
scanning electron microscope ( SEM) analysis,and porosity and permeability test,it can be concluded that,the pyroclastic
rocks are mainly composed of andesitic pyroclastic rocks and pyroclastic lava,and their corresponding lithofacies
is dominated by air-fall subfacies of explosive facies. The tuffaceous cemented volcanic breccias show a top reservoir
quality with porosities ranging from 3. 86% to 8. 76% and an average permeability of 0. 397 ×10 - 3 μm2 . During
the process of later diagenesis,most of the primary reservoir spaces have been filled up,and the secondary pores
and fractures formed by dissolution and tectonism have contributed the main body of the current effective reservoir
spaces,which mainly existed as the combination of reticular microfractures and dissolution micro-holes. |
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Keywords:
southern Songliao Basin
Changling fault depression
Longfengshan area
Huoshiling Formation;
pyroclastic rock
diagenesis
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