东北石油大学学报2024，Vol.48Issue(3)：40-51,68,13.DOI:10.3969/j.issn.2095-4107.2024.03.004
南羌塘坳陷中侏罗统布曲组碳酸盐岩储层特征及控制因素
Reservoir characteristics and controlling factors of the Middle Jurassic carbonate reservoir in the Buqu For-mation,Southern Qiangtang Depression
摘要
Abstract
Based on field profiles,drilling,and core data,this study explores the characteristics and con-trolling factors of the Middle Jurassic Buqu Formation carbonate reservoir using methods such as core observation,conventional and cast thin section identification,scanning electron microscopy,cathodolu-minescence,mercury intrusion,and porosity and permeability testing.The results indicate that the car-bonate reservoir rocks of the Middle Jurassic Buqu Formation in the South Qiangtang Depression are mainly composed of bright crystal oolitic limestone,grain dolomite,(residual)grain dolomite,and bio-clastic limestone.The storage space mainly consists of intragranular dissolution pores,mold pores,in-tergranular pores,intergranular dissolution pores,non fabric selective dissolution pores,and cracks.The physical properties of reservoirs with different rock types vary significantly,with dolomite reser-voirs having better physical properties than transitional rocks and limestone,mainly belonging to classⅡ-Ⅲ reservoirs.Sedimentary facies and diagenesis are the controlling factors for favorable reservoirs.The material basis for the development of favorable reservoirs is formed by the sedimentation of carbon-ate platform margin shoals and intra platform shoals.Dolomitization,dissolution,and pressure dissolu-tion are key factors for the formation of favorable reservoirs.Thorough dolomitization has a significant promoting effect on the increase of reservoir porosity.Fine crystalline self formed dolomite has the best physical properties.The various fractures generated by tectonic fracturing are beneficial for the migra-tion of dissolution fluids and effectively improve reservoir properties.This result provides geological ba-sis for the next step of oil and gas exploration in the study area.关键词
羌塘盆地/中侏罗统/布曲组/碳酸盐岩/储层特征/控制因素Key words
Qiangtang Basin/Middle Jurassic/Buqu Formation/carbonate rocks/reservoir characteris-tics/controlling factors分类
天文与地球科学引用本文复制引用
徐康,马泽良,庄新兵,李吉鹏,李风勋,刘栩,刘中戎,范志伟,宫晗凝..南羌塘坳陷中侏罗统布曲组碳酸盐岩储层特征及控制因素[J].东北石油大学学报,2024,48(3):40-51,68,13.基金项目
中国石油化工股份有限公司科技部项目(P22197) （P22197）
中国石油化工股份有限公司科技部项目(P22198) （P22198）
