Study on diagenetic heterogeneity of the Middle Triassic Leikoupo Formation in front area of Longmenshan Mountains
Peng Jingsong1, Liu Shugen2, Zhang Changjun2, Zhang Rucai1, Zhang Jiangtao1
1 Tianjin Branch of CNOOC Ltd., Tianjin 300452 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan
Abstract：With a series of new carbonate gas fields discovered in Sichuan Basin,the front area of Longmenshan Mountains in western Sichuan Basin, where has good petroleum potential, is gradually becoming a target area for large- and middle-scale oil and gas fields. Focusing on the reservoir heterogeneity of the Middle Triassic Leikoupo Formation,by means of core description and slice observation, this paper in detail studied the reservoir diagenesis of the Zhongba and Dayuanbao subareas in the front areas of Longmenshan Mountains. The conclusions are:(1)The diagenesis of the Middle Triassic Leikoupo Formation is complicated in the front areas of Longmenshan Mountains. And it mainly includes compaction,pressolution,cementation,gypsification,dissolution,recrystallization,dolomitization,silicafication and so on.(2)The hydrothermal fluids from the deep layer invaded into Leikoupo Formation and resulted in extensive hydrothermal dissolution,cementation and dolomitization,influenced by the rifting activity in the final phase of the Middle Triassic.(3)Cementation interrupting and hypergene dissolution controlled by tectonic high points are the main factors that lead to better reservoirs in Zhongba-Qinling subareas than in Tiantaishan subarea. The tectonic background and palaeogeomorphology before inversion of the front area of Longmenshan Mountains determined the diagenetic heterogeneity of Leikoupo Formation,and controlled the distribution of quality reservoir.
Peng Jingsong,Liu Shugen,Zhang Changjun et al. Study on diagenetic heterogeneity of the Middle Triassic Leikoupo Formation in front area of Longmenshan Mountains[J]. JOPC, 2014, 16(6): 790-801.
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