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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2014-06
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Controlling factors of formation and distribution of Lower Cambrian Longwangmiao Formation high-quality reservoirs in Sichuan Basin,China

LIU Shu-gen;SONG Jin-min;ZHAO Yi-hua;ZHONG Yong;SONG Lin-ke;TIAN Yan-hong;LIANG Feng;YIN Ke-wei;LI Jun-liang;State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu University of Technology;Central Sichuan Mining District,Southwest Oil and Gas Field Branch Company of CNPC;  
The Lower Cambrian Longwangmiao Formation is the play of the Anyue supergiant gas field in Sichuan Basin.Based on the integrated study of the outcrops on the basin margin and the drilling cores in Sichuan Basin,this paper discusses the controlling factors of the formation and distribution of the high-quality reservoirs of the Longwangmiao Formation through the researches on the strata correlation,reservoir petrology,property characteristics and diagenesis etc..The Longwangmiao Formation could be well correlated in the basin scale,and the reservoir rocks are composed of dolarenite dolomite,oolitic dolomite and crystalline dolomite.The reservoir is of the pore-fracture type with low porosity and low permeability.The reservoir thickness with the porosity over 2% is about 20~60m.The reservoir in the Moxi area is much thicker than that in the Gaoshiti area.The penecontemporaneous selective fresh water dissolution and liquid hydrocarbon filling have been controlled by the Early Cambrian Mianyang-Changning intracratonic sag to a certain extent.Three factors control the formation and distribution of the good-quality reservoir rocks in Longwangmiao Formation,that is,the inherited palaeogeomorphology of the intracratonic sag,the contemporaneous karst and the liquid hydrocarbon filling.The paleohigh formed by the footwall of margin fault of the intracratonic sag controls the distribution of the grain bank of Longwangmiao Formation.The intergranular and intragranular dissolution pores produced by the contemporaneous atmospheric freshwater karstification are important for the upcoming fluid filling and further dissolution.The hydrocarbon filling at the peak period of the generation and expulsion of the source rocks is beneficial to the increase of pores and the protection of the previous pores.The paleohigh formed by the faults along the two sides of the Mianyang-Changning intracratonic sag controls the formation and distribution of the early high-quality reservoirs,and the overlapping areas of the Lower Cambrian hydrocarbon-generating center and the Chuanzhong paleouplift are the most favorable areas of the late good-quality reservoirs.The most profitable areas for the distribution of the high-quality reservoir rocks and natural gas accumulations in Longwangmiao Formation are the eastern part of the overlapping areas of the Mianyang-Changning intracratonic sag and the Chuanzhong paleouplift,that is,the Gaoshiti-Moxi area.
【Fund】: 国家重点基础研究发展计划“973”项目(2012CB214805)
【CateGory Index】: P618.13
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