Sedimentary architecture and distribution of intra-platform shoal in sequence framework of Permian Changxing Formation in central Sichuan Basin, SW China

被引：0

作者：

Wang D. ^{[1
,2
]}

Liu H. ^{[2
,3
]}

Tang S. ^{[4
]}

Bai J. ^{[1
,2
]}

Zhou G. ^{[5
]}

Li Z. ^{[4
]}

Liang F. ^{[6
]}

Tan X. ^{[1
,3
]}

Geng C. ^{[7
]}

Yang Y. ^{[1
,2
]}

机构：

[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu

[2] Sichuan Natural Gas Geology Key Laboratory, Southwest Petroleum University, Chengdu

[3] Southwest Petroleum University, Division of Key Laboratory of Carbonate Reservoirs, CNPC, Chengdu

[4] Central Sichuan Oil and Gas District, PetroChina Southwest Oilfield Company, Suining

[5] Research Institute of Petroleum Exploration and Development, PetroChina Southwest Oilfield Company, Chengdu

[6] Gas Production Administrative Department of Northern Central Sichuan Gas District, PetroChina Southwest Oilfield Company, Suining

[7] Southern Sichuan Gas District, PetroChina Southwest Oilfield Company, Luzhou

来源：

Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2023年 / 50卷 / 02期

关键词：

intra-platform shoal; Permian Changxing Formation; sedimentary evolution model; sequence stratigraphic framework; Sichuan Basin; typical sedimentary sequence;

D O I：

10.11698/PED.20220570

中图分类号：

学科分类号：

摘要：

Based on the comprehensive analysis of core, thin section, logging and seismic data, this study carried out the identification and comparison of Permian Changxing Formation sequences, clarified the typical sedimentary architectures of intra-platform shoal, investigated the vertical and horizontal development and distribution of intra-platform shoal in each sequence, and thus established the sedimentary evolution model of shoal body. The study results are reflected in four aspects. First, there are two complete third-order sequences (SQ1 and SQ2) in Changxing Formation in central Sichuan Basin. SQ1 is generally thick in the north and thin in the south, and SQ2 shows a thickness differentiation trend of “two thicknesses and three thinnesses”. Second, the Changxing Formation in central Sichuan Basin mainly develops intra-platform shoal, inter-shoal sea and intra-platform depression subfacies. In the vertical direction, the intra-platform shoal mainly presents two typical sedimentary sequences: stable superposed and high-frequency interbedded. Third, the stable superimposed sedimentary sequence is developed in the shoal belt at the edge of intra-platform depression, which is composed of two shoal-forming periods and located in the highstand systems tracts (HSTs) of SQ1 and SQ2. The high-frequency interbedded sedimentary sequence is developed in the southern shoal belt of intra-platform depression, which is composed of four shoal-forming periods and mainly located in the HST of SQ2. Fourth, during the SQ1 deposition, the intra-platform shoal was mainly developed at the edge of the intra-platform depression on the north side of the study area, and the inter-shoal sea subfacies was mainly developed on the south side. During the SQ2 deposition, the intra-platform shoal was widely developed in the area, forming two nearly parallel intra-platform shoal belts. The study results provide direction and ideas for exploration of Changxing Formation intra-platform shoal reservoirs in central Sichuan Basin. © 2023 Science Press. All rights reserved.

引用

页码：346 / 359

页数：13

共 35 条

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