Reservoir characteristics and exploration target of the Middle Triassic Leikoupo Formation in Sichuan Basin

doi:10.3969/j.issn.1672-7703.2021.05.006

Abstract

Abstract: The Middle Triassic Leikoupo Formation is a major strategic replacement fi eld for petroleum exploration of PetroChina Southwest Oil and Gas Field Company in Sichuan Basin. The exploration situation is changing, and the rule of reservoir distribution in basin scale is necessary to be identifi ed, so as to provide guidance for gas exploration in the near future. The lithofacies paleogeography within sequence framework is further understood and reservoir characteristics are comprehensively analyzed by using a large number of core samples, well logging, seismic and outcrop data. The results show that: (1) It was a limited platform environment in Sichuan Basin during the deposition of Leikoupo Formation. The formation is subdivided into four tertiary sequences, and the favorable reservoirs are mainly developed in L1 1(1st sub-member of the 1st member of Leikoupo Formation), L33 and L43 sub-members of transgressive system tract; (2) The paleogeographic pattern of “one subsag and two uplifts” during the deposition of Leikoupo Formation controlled the distribution of beach reservoir, in which it was composite superimposed in the piedmont of Longmen Mountain in the western basin while it was migration superimposed of themarginal beach body of gypsum salt lake in the eastern basin; (3) There are two types of reservoirs of Leikoupo Formation, i.e., the faciescontrolled reservoir and karst reservoir. The former is dominated by grain beach dolomite and microbial dolomite, which is mainly developed in the basin margin and paleo highs inside the basin, while the latter is developed in the superimposed area of favorable facies zones and karst residual mounds. Finally, the favorable exploration targets are proposed by comprehensively considering source rocks, reservoir types and trap conditions, including grain beach dolomite and microbial dolomite reservoirs of L3 and L4 members in Jiange-Jiangyou-Mingshan area, beach dolomite reservoirs of L1 member in Ziyang-Nanchong area and the western margin of Luzhou paleo uplift, and karst reservoir in central Sichuan region.

CLC Number:

TE112.23

Tian Han, Wang Guiwen, Duan Shufu, Xin Yongguang, Zhang Hao. Reservoir characteristics and exploration target of the Middle Triassic Leikoupo Formation in Sichuan Basin[J]. China Petroleum Exploration, 2021, 26(5): 60-73.

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