首页|Effects of Intracratonic Strike-slip Fault on the Differentiation of Carbonate Microfacies:A Case Study of a Permian Platform Margin in the Sichuan Basin(SW China)

Effects of Intracratonic Strike-slip Fault on the Differentiation of Carbonate Microfacies:A Case Study of a Permian Platform Margin in the Sichuan Basin(SW China)

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In intracratnoic basins,the effect of strike-slip faults on sedimentary microfacies is generally underestimated due to their small scale.Based on the integration of core,well logs,and three-dimensional seismic data,this study presents a comprehensive analysis of the Permian carbonate platform and strike-slip faults in the southwestern Kaijiang-Liangping trough of the Sichuan Basin.The relationship between strike-slip faults and Permian carbonate microfacies is investigated.The results reveals the existence of a NW-trending strike-slip fault zone along the platform margin,exhibiting clear segmentation.The western side of the study area exhibits a rimmed platform margin characterized by type Ⅰ reefs,which corresponds to the presence of a large-scale strike-slip fault zone.In contrast,the eastern side is characterized by a no-rimmed and weak rimmed platform margin,accompanied by type Ⅱ reefs,which align with smaller strike-slip fault zones.It was found that the strike-slip fault had some effects on the platform and reef-shoal complex of the Permain Changxing Formation.First,the platform was divided by strike-slip fault into three segments to show rimmed,week rimmed and no-rimmed platform.Second,reef-shoal complex devolped along the faulted high position in the strike-slip fault zone,and separated by faulted depression.Third,strike-slip faults can offset or migrated the reef-shoal complex and platform margin.Additionally,the thickness of the platform margin varies across strike-slip fault zone,which is related to the activity of strike-slip faults.The strike-slip faults affect the microfacies by controlling the pre-depositional paleotopography.This case suggests that the strike-slip faults play a crucial role in the diversity and distribution of carbonate microfacies in the intracratonic basin.

strike-slip faultssegmentationcarbonate platformsediment dispersal patternChangxing FormationKaijiang-Liangping troughSichuan Basin

LIU Jiawei、WU Guanghui、TANG Qingsong、WU Yonghong、ZHANG Wenjin、ZHAO Zhongyu

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School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China

Qiangtang Basin Research Institute,Southwest Petroleum University,Chengdu 610500,China

Southwest Petroleum University,Division of Key Laboratory of Carbonate Reservoirs of CNPC,Chengdu 610500,China

PetroChina Southwest Oil & Gasfield Company,Chengdu 610051,China

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PetroChina Southwest Oil and Gasfield Company for data support and project researchScience and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance

42241000172020CX010300

2024

10.1111/1755-6724.15203

地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子：1.414
ISSN：1000-9515
年,卷(期)：2024.98(4)