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)OACSTPCD
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)
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.
LIU Jiawei;WU Guanghui;TANG Qingsong;WU Yonghong;ZHANG Wenjin;ZHAO Zhongyu
School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,ChinaSchool 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,ChinaPetroChina Southwest Oil & Gasfield Company,Chengdu 610051,China
strike-slip faultssegmentationcarbonate platformsediment dispersal patternChangxing FormationKaijiang-Liangping troughSichuan Basin
《地质学报（英文版）》 2024 (004)
936-954 / 19
The authors thank the PetroChina Southwest Oil and Gasfield Company for data support and project research.We are grateful to Ma Bingshan and Wang Xupeng for their help.Comments provided by editors and reviewers of the manuscript are much appreciated and were very helpful in improving the paper.This study has been partly supported by the National Natural Science Foundation of China(Grant No.4224100017)and Science and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance(Grant No.2020CX010300).
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