Stratigraphic sequence re-determination and lithofacies palaeogeographical characteristics of the Sinian Dengying Formation in Sichuan Basin
ZHAO Wenzhi1,2, WANG Xiaofang2,3, WANG Xin2,3, WANG Kun1, SHEN Anjiang2,3
1 Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China; 2 Key Laboratory of Carbonate Reservoirs,CNPC,Hangzhou 310023,China; 3 PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China
Abstract：The Ediacaran(Sinian)stratum is a carbonate sedimentary assemblage with good source-reservoir-cap conditions formed after the Proterozoic Second Great Oxidation Event(NOE),where a major breakthrough had been made in the exploration of primary gas reservoirs in the Sichuan Basin. The stratigraphic division and comparison of the Dengying Formation in the Deyang-Anyue intra-platform rift and the surrounding area are not uniform,which restricts the understanding of the lateral distribution characteristics of the mounds and shoals in the platform margin. Based on drilling,outcrop and seismic data,through petrological,electrical and geochemical analysis,this paper carried out the re-determination of the Dengying Formation stratigraphic sequence. On this basis,the lithofacies palaeogeography of the Dengying Formation was reconstructed,and the followings were concluded: (1)The Dengying Formation standard profile and segmented lithologic assemblages in Hujiaba(Ningqiang County, Shaanxi Province) area were established,and it was pointed out that the strata in Wells Gaoshi-131X, Zhongjiang-2 and Pengtan-1 were originally classified as the Member 2 should belong to the Member 4 of Dengying Formation,and the Member 4 on the platform margin is trichotomous with distinctive features,and the isochronous stratigraphic framework was constructed. (2)The migration law of the mounds and shoals within the isochronous stratigraphic framework was clarified,that is,in the eastern segment of the Deyang-Anyue intra-platform rift,the Member 4 of Dengying Formation platform margin mounds and shoals prograde from east to west,while in a direction perpendicular to the facies belt,they shifted from south to north. The mounds and shoals of the lower,middle and upper sub-member of the Member 4 of Dengying Formation are developed in the south of central Sichuan paleo-uplif,in the Taihe area in the center of the basin,and in the Ningqiang area in the north of basin,respectively. For this,three tectonic-lithofacies palaeogeographic maps were compiled for the lower,middle and upper sub-members of the Member 4 of Dengying Formation. (3)The above understanding is of great significance for the prediction of favorable reservoir distribution in the Deyang-Anyue intra-platform rift and the surrounding Dengying Formation and for guiding natural gas exploration. Central Sichuan paleo-uplift,Taihe area and Ningqiang area are all located on the same platform margin belt in Sinian. In the Central Sichuan Paleo-uplift in the south,the Anyue trillion cubic gas field has been discovered,and a gas block at a scale of one trillion cubic meters has been preliminarily determined in the Taihe area in the center,and the Ningqiang area in the north also has favorable conditions to form a trillion-cubic-meter gas large block,which is worth looking forward to.
ZHAO Wenzhi,WANG Xiaofang,WANG Xin et al. Stratigraphic sequence re-determination and lithofacies palaeogeographical characteristics of the Sinian Dengying Formation in Sichuan Basin[J]. JOPC, 2022, 24(5): 852-870.
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