四川盆地川西坳陷龙门山前雷口坡组四段气藏层序划分及储层发育控制因素

doi:10.11743/ogg20170412

Abstract

Abstract: Based on detailed observation of cores,thin section,well logging and seismic data analysis,high frequency sequence and sedimentary microfacies of the Upper T₂l⁴ were studied in the Shiyangchang-Jinma-Yazihe area of foreland of Longmen Mountains in western Sichuan Depression.Combined with logging interpretation results,the reservoir distribution and controlling factors of reservoir development are analyzed.The results indicate that the Upper T₂l⁴ can be divided into one fourth-order sequence,and may be further divided into multiple fifth-order and sixth-order high frequency sequences.The high frequency sequence has the characteristics of sedimentary assemblages obviously shallowing upward and their horizontal correlation is good.Sedimentary environments mainly are tidal flat in the research area,and the tidal flat depo-sits mainly develop intertidal zone and subtidal zone sub-facies.Lithology of flat deposits is varied in the vertical direction and is more stable in horizontal orientation.Intertidal zone is a favorite sub-facies for reservoir development,and can be divided into dolomite flat,algae dolomite flat,dolomite-lime flat micro-facies.Subtidal zone can be divided into lime flat,algae lime flat,dolomite lime flat micro-facies.Silty-fine dolomite flat,algal (laminated) dolomite flat in the intertidal zone is favorable micro-facies for reservoir development.They were usually distributed in middle-upper part of upper and lower reservoir with clear reservoir cycles.The favorable intertidal micro-facies distribution reservoir for development is controlled by (high frequency) sequence,which also has a certain impact to later diagenesis.The high frequency sequence is the key factor to affect reservoir formation and distribution.

Key words: sequence stratigraphy, reservoir distribution, sedimentary facies, gas pool, Leikoupo Formation, Western Sichuan Depression, Sichuan Basin

CLC Number:

TE121.3

Li Hongtao, Hu Xiangyang, Shi Yunqing, Xiao Kaihua, Jia Yuewei, Wei Xiuping, Feng Qiong. Sequence division and controlling factors of reservoir development of the 4th Member of Leikoupo Formation in foreland of Longmen Mountains in the Western Sichuan Depression,Sichuan Basin[J]. Oil & Gas Geology, 2017, 38(4): 753-763.

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Sequence division and controlling factors of reservoir development of the 4th Member of Leikoupo Formation in foreland of Longmen Mountains in the Western Sichuan Depression,Sichuan Basin

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