四川盆地中三叠统雷口坡组沉积特征及有利储集相带

doi:10.11743/ogg20180307

Abstract

Abstract: In order to look for new fairways for future gas exploration in the Sichuan Basin,we worked on revealling the sedimentary characteristics and distribution of favorable reservoir facies in the Middle Triassic Leikoupo Formation.The study took marine carbonate sequence stratigraphy and reservoir sedimentology theory as guidance.Based on the markers in logging data,from cores,and sequence boundaries including unconformity,we conducted the sequence stratigraphy division and identification of sedimentary facies.Then spatial boundaries of sedimentary facies in each sequence are delineated,and the lithofacies paleogeographic map of each system tract in every sequence are compiled to predict favorable reservoir facies distribution.The results show that the Middle Triassic Leikoupo Formation in the Sichuan Basin develops a set of shallow water carbonate platform sedimentary system,including 4 major sedimentary facies,namely,restricted platform,evaporitic platform,platform edge and open platform.In general,the formation appears to be higher in the east and plunges to the west,with significant uplift and sag within the platform driven by early Indosinian tectonic movement.Due to basement uplift,some of the upper sections of the formation are eroded by long-term exposure,companied by development of a weathering crust.Furthermore,based on sedimentary facies recognition and sequence interface markers,we divided the Middle Triassic Leikoupo Formation into 4 third-tier sequences and 8 system tracts:the paleo-uplift in the central basin and its surrounding dolomite flat,and the platform edge bank of the northwestern Mianzhu and Jiange uplifts,are favorable reservoir facies because of their better reservoir properties and effective coupling of reservoir and caprock.Therefore,we conclude that these fairways are the most favorable areas for future exploration in the Middle Triassic Leikoupo Formation in the Sichuan Basin.

Key words: dolomite flat, platform edge bank, lithofacies paleogeography, sequence stratigraphy, Leikoupo Formation, Middle Triassic, Sichuan Basin

CLC Number:

TE121.3

Sun Chunyan, Hu Mingyi, Hu Zhonggui, Deng Qingjie. Sedimentary characteristics and favorable reservoir facies distribution of the Middle Triassic Leikoupo Formation,Sichuan Basin[J]. Oil & Gas Geology, 2018, 39(3): 498-512.

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Sedimentary characteristics and favorable reservoir facies distribution of the Middle Triassic Leikoupo Formation,Sichuan Basin

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