Abstract：The Upper Triassic Ma'antang Formation is the most important stratigraphic unit for petroleum exploration in Sichuan Basin. Based on the lithofacies analysis of 12 outcrops and 10 coring wells, the log facies analysis of 480 wells and the interpretation of 2D seismic survey line with 2500 km,the concerning types,distribution,facies model and controlling factors of sedimentary facies of the Ma'antang Formation were systematically discussed in this paper. As a result,it is proposed that the Ma'antang Formation includes four types of sedimentary facies from south to north: reef flat,lagoon,tidal flat and delta. The reef flat facies is distributed along the Longmen Mountain orogenic belt in the western margin of the basin;the tidal flat facies and lagoon facies are mainly located in the middle of the basin;while the delta facies is distributed chiefly in the northwestern and middle of the basin. Three factors are contributed to the formation of the sedimentary facies,including the flatpalaeotopography,the low productivity of carbonate and low velocity of palaeo-base level change. There are four types of reservoirs, namely oolitic bank, bioclastic bank, reef and deltaic sand body in the Ma'antang Formation, and source rocks of lagoon facies. The above reservoirs and source rocks are well matched to constitute an effictive assemblage of source rock and reservoir.
Shi Zhensheng,Wang Zhihong,Hao Cuiguo et al. Sedimentary facies of the Upper Triassic Maantang Formation in Sichuan Basin[J]. JOPC, 2015, 17(6): 771-786.
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