The discovery of Middle Permian Guangyuan-Bazhong extensional trough in the Sichuan Basin and its petroleum geological significance

doi:10.3969/j.issn.1672-7703.2019.04.007

Abstract

Abstract: Based on the comprehensive analysis of outcrop, drilling and seismic data, a Middle Permian trough is discovered in the Guangyuan-Bazhong area of the Sichuan Basin. And it is an extensional trough which is formed under the effect of Hercynian tension along the northwestern margin of Upper Yangtze, and its geological-seismic characteristics are obvious. It is extended in the direction of northwest, with a width of 70-120 km and an area of about 2?04 km2. According to the distribution of its central line, it is named as Guangyuan-Bazhong extensional trough. This extensional trough controls the distribution of the Middle Permian hydrocarbon source rocks. Inside the extensional trough are deepwater undercompensation sediments. It is filled with argillaceous rocks of deepwater shelf facies with the thickness of 10-30 m and its TOC ranges from 2% to 9%, so it is classified as high-quality hydrocarbon source rock. It also controls the formation and distribution of high-quality reservoirs in the platform margin belt of Maokou Formation, Middle Permian. The sediments of platform margin beach facies are developed on both sides of the extensional trough. It is indicated from the 3D seismic data interpretation that the platform margin belt covers an area of 3000 km2 with a width of 8-10 km. Owing to the diagenetic reformation (such as karstification), large-scale high-quality reservoirs can be formed. The discovery of Guangyuan-Bazhong extensional trough changes the traditional understanding that the Permian tectonic sedimentary differentiation in the Sichuan Basin is formed in the Changxing Period. The high-quality source rocks inside the extensional trough and the large-scale reservoirs of beach facies in the periphery constitute the source-reservoir configuration relation of side generation and lateral preservation, they are the favorable reservoir-forming assemblages and the importation exploration direction of the Maokou Formation.

CLC Number:

Zhang Xihua, Chen Cong, Huang Jie, Wen Long, Xie Chen, Xu Shiwei, Gao Zhaolong. The discovery of Middle Permian Guangyuan-Bazhong extensional trough in the Sichuan Basin and its petroleum geological significance[J]. China Petroleum Exploration, 2019, 24(4): 466-475.

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