Global Geology 2014, 27(2) 93-104 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
 Lishu fault-depression
Huoshiling Formation
volcanic lithofacies
logging identiffcation
whole-coring well SN165C
Authors
LI Yonggang and YAN Bo
PubMed
Article by LYAYB

 Facies logging identiffcation of intermediate-basic volcanic rocks in Huoshiling Formation of Songliao Basin

  LI Yonggang 1 and YAN Bo 2* 

 1. Northeast Oil and Gas Company, SINOPEC, Changchun 130022, China; 

2. College of Earth Sciences, Jilin University, Changchun 130061, China 

Abstract

 Volcanic oil and gas reservoirs are generally buried deep, which leads to a high whole-well coring cost, and the degree of development and size of reservoirs are controlled by volcanic facies. Therefore, accurately identifying volcanic facies by logging curves not only provides the basis of volcanic reservoir prediction but also saves costs during exploration. The Songliao Basin is a ‘fault-depression superimposed’ composite basin with a typical binary filling structure. Abundant types of volcanic lithologies and facies are present in the Lishu fault depression. Volcanic activity is frequent during the sedimentary period of the Huoshiling Formation. Through systematic petrographic identiffcation of the key exploratory well (SN165C) of the Lishu fault-depression, which is a whole-well core, it is found that the Huoshiling Formation in SN165C contains four facies and six subfacies, including the volcanic conduit facies (crypto explosive breccia subfacies), explosive facies (pyroclastic flow and thermal wave base subfacies), effusive facies (upper and lower subfacies), and volcanogenic sedimentary facies (pyroclastic sedimentary subfacies). Combining core, thin section, and logging data, the authors established identification markers and petrographic chart logging phases, and also interpreted the longitudinal variation in volcanic petro-graphic response characteristics to make the charts more applicable to this area's volcanic petrographic interpretation of the Huoshiling Formation. These charts can provide a basis for the further exploration and development of volcanic oil and gas in this area. 

Keywords  Lishu fault-depression   Huoshiling Formation   volcanic lithofacies   logging identiffcation   whole-coring well SN165C  
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