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《Marine Geology Frontiers》 2018-10
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CHARACTERISTICS AND FORMING MECHANISM OF THE RESERVOIRS IN THE SECOND MEMBER OF DENGYING FORMATION IN NORTHERN SICHUAN

DU Yao;WANG Xingzhi;ZHANG Qiaoyi;FENG Mingyou;ZENG Deming;ZHANG Benjian;PEI Senqi;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation;Southwest Petroleum University;BGP Southwest Geophysical Research Institute,CNPC;Northwest Division of PetroChina Southwest Oil &Gas Field Company;  
On the basis of the macroscopic and microscopic characteristics and geochemical data from both outcrops and drilling cores,this study is devoted to the detailed investigation of reservoir characteristics of the 2 nd Member of Dengying Formation and main controlling factors in northern Sichuan.As the data shows,the reservoir rocks mainly consist of grain conglutinate dolomites,stromatolitic algal dolomites and dolomitic karst breccia.In terms of reservoir space,the reservoirs are dominated by dissolved pores in the algae-adherent rocks,cave-dissolving cavities,karst-dissolve joints and grape cambiums.Most of the reservoirs belong to the hole type,which are characterized by low porosity and low permeability.High-quality reservoirs of the region are composed of the materials from particle gluten beach and algae mound.Compaction-pressure solution and multi-stage cementation are the main reasons to the disappearance of primary pores.Moreover,the epigenetic karst resulted from the EpisodeⅠof Tongwan movement played important role in reservoir forming.The combination of all the processes mentioned above make the reservoirs mainly distributed in the middle and upper part of the 2 nd Member of Dengying Formation.
【Fund】: 国家油气重大专项(专题)“全球性海侵(湖侵)与气候变化对大型地层油气藏形成的控制作用”(2017ZX05001001-002);; 国家自然科学基金“四川盆地震旦系灯影组葡萄状构造精细研究”(41402126)
【CateGory Index】: P618.13
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