Deformation and Petroleum Significance of Strike-Slip Faults on the Northern Slope of the Leshan-Longnvsi Paleouplift

doi:10.7657/XJPG20260206

Abstract

Abstract:

Numerous strike-slip faults with small throws, complex planar configurations, and insufficient quantitative constraints on multi-phase activities are developed on the northern slope of the Leshan-Longnvsi paleouplift in the Sichuan Basin. Based on detailed interpretation of key horizons and faults using newly acquired contiguous 3D seismic data, this study investigates the changes in stratigraphic extension and thickness-domain subsidence,and analyzes the deformation characteristcs and evolutionary stages of the strike-slip faults, and their influences on hydrocarbon accumulation. The research results reveal that the strike-slip faults on the northern slope primarily trend in nearly EW and NW-SE. In cross-section, they exhibit vertical, Y-shaped, and flower structure geometries. On plan view, they display combinations such as miniature pull-apart faults, linear faults, en echelon faults, and horsetail faults. The strike-slip faults are characterized by layered and segmented structural deformation. Considering the regional tectonic setting, the strike-slip faults on the northern slope are interpreted to have undergone multistage and inherited development, with the Late Sinian-Early Cambrian and Middle-Late Permian being the primary active periods, which respectively correspond to the developmental timing of the Mianyang-Changning extensional trough and Pengxi-Wusheng subsag within the Sichuan Basin. The formation and evolution of the strike-slip faults in the study area took place across hydrocarbon generation, migration, accumulation, and destruction process, playing a controlling role in the formation of the Permian reservoirs.

Key words: Sichuan Basin, Leshan-Longnvsi paleouplift, northern slope, strike-slip fault, deformation characteristic, tectonic evolution, hydrocarbon accumulation

CLC Number:

P552

WANG Xinlan, LI Zhiwu, XIE Yaoli, LIANG Hong, ZHANG Lingli, XU Baoliang, GUO Ran, CHEN Hui, YOU Liwei. Deformation and Petroleum Significance of Strike-Slip Faults on the Northern Slope of the Leshan-Longnvsi Paleouplift[J]. Xinjiang Petroleum Geology, 2026, 47(2): 172-183.

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