Fault evolution and hydrocarbon significance in the Changling Fault-Depression

doi:10.3969/j.issn.1006-6535.2025.04.009

Abstract

Abstract: To clarify the tectonic features of the major control faults of the Changling Fault-Depression and the influence of their activity on hydrocarbon accumulation, this article analyzed the activity characteristics of the major control faults of each depression using growth index, paleo-displacement, and activity rate through the fine interpretation of the key seismic profiles of the Changling Fault-Depression and the restoration analysis of the balanced profile, and discussed the influence of the fault activity on the evolution of each depression in the Changling Area, the formation of the trap, and the formation of the oil and gas reservoirs. The study shows that the major control faults of the Changling Fault-Depression have experienced multi-phase activity with inheritance, connecting multiple series of strata and providing favorable conduits for hydrocarbon migration and accumulation. At the syn-rift stage, active faulting enabled large-scale oil generation from Shahezi Formation source rocks, with lateral and vertical migration along the major faults. At the rift attenuation stage, most faults became syn-sedimentary due to tensional stress, forming local syn-sedimentary antic, reverse drag structures, and nosing structures. At the post-rift stage, fault activity declined or ceased, with most faults acting as seals. At the inversion stage, faults were compressed into inverted faults, causing hydrocarbon reservoir adjustment andremigration. The Changling Depression has an east-west-trending "three grabens interspersed with two horsts" zonation. Structural evolution differences among depressions affect the accumulation mode of depressions in the Changling Fault-Depression. This study enhances understanding of the tectonic features of the major control faults of the Changling Fault-Depression and offers insights into evaluating the impact of such faults on accumulation modes.

Key words: fault evolution, hydrocarbon accumulation, growth index, paleo-displacement, activity rate, fault activity, Changling Fault-Depression

CLC Number:

TE122

LIU Jiayu, LI Tao, YANG Guang, HU Jia, ZHANG Jiachang, CAI Yuxun. Fault evolution and hydrocarbon significance in the Changling Fault-Depression[J]. Special Oil & Gas Reservoirs, 2025, 32(4): 77-86.

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