Sedimentary Patterns and Depositional Systems of the Lower Cambrian Qiongzhusi Formation in the Southern Sichuan Basin

doi:10.11885/j.issn.1674-5086.2024.11.16.15

Abstract

Abstract: Recent advancements in shale gas exploration of the Qiongzhusi Formation in the southern Sichuan suggest that this interval has the potential to become a significant successor to the Wufeng-Longmaxi shale gas play. The shale sequences exhibit uneven lateral distribution, with notable variations in sedimentary facies characteristics, which pose challenges to further exploration and development. Drawing on the latest advances in fine-grained sedimentology, along with new drilling, well logging, and seismic data, this study analyzes the lithology, geochemistry, and sedimentary fabric of fine-grained sediments to elucidate sedimentary patterns, depositional environments, and sedimentary system development. The results indicate that: 1) synsedimentary fault activity led to the formation of a north-south-trending groove facies area in central Sichuan and the Exi-Yudong Region, generating a sedimentary deep-water gentle slope pattern characterized by "three platforms and two troughs". 2) controlled by the Mianyang-Changning groove facies area, a coastal-shelf-basin sedimentary system was established in southern Sichuan, with four subfacies: shallow-water gentle slope, deep-water gentle slope, steep slope and trough-basin. The Jingyan and Ziyang areas are dominated by shallow-water gentle slope and deep-water gentle slope subfacies, respectively. 3) fine-grained sediments sourced from the west were modified by storm currents, turbidity flows, and bottom currents, forming shallow-water gentle slope turbidites, bottom-current mounds, and deep-water gentle slope turbidites microfacies. 4) we established the sedimentary model based on fine-grained sedimentology and sedimentary patterns, providing crucial insights for the exploration of new shale gas plays within the Qiongzhusi Formation.

Key words: Sichuan Basin, shale gas, Qiongzhusi Formation, sedimentary pattern, sedimentary system

CLC Number:

TE122

XIONG Liang, ZHONG Yijiang, DONG Yixin, PENG Minghong. Sedimentary Patterns and Depositional Systems of the Lower Cambrian Qiongzhusi Formation in the Southern Sichuan Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(6): 15-31.

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