石油物探2024，Vol.63Issue(4)：869-880,12.DOI:10.12431/issn.1000-1441.2024.63.04.015
克拉通内盆地走滑断层地震判识的若干陷阱
Pitfalls in seismic identification of strike-slip faults in intracraton basin
摘要
Abstract
It is challenging to identify strike-slip faults in a Craton basin owing to their small displacement,small deformation,and complicated tectonic features,particularly in the context of low seismic resolution and false images in deep zones.According to typi-cal seismic signatures of intracraton strike-slip faults in the Tarim and Sichuan Basins and geologic factors,we identify misconcep-tions of seismic interpretation and extract three pitfalls.The first is that precipitous cliffs at basement,step-like fractures,and faul-ted horsts may be misinterpreted as flower structures;similar folds occurring vertically between the basement and overburden may be treated as strike-slip structures by mistake.The second is false images of underlying rock masses as steeply dipping strike-slip faults on seismic sections caused by the occurrence of eruptive rocks and evaporites with lateral thickness and lithology variations,leading to sudden interval velocity change laterally.The third is strike-slip fault-like responses related to some geologic phenome-na,e.g.large vertical ravines,karst landform,and lithofacies change.To avoid these pitfalls,the impacts of evaporite and igneous-rock velocities,landform,and lithofacies should be mitigated in enhanced-resolution seismic data interpretation.Seismic attribute maps are the top selection for strike-slip fault identification to exclude false images of strike-slip faults on seismic sections and es-tablish a correct model for seismic-geologic interpretation of strike-slip faults.关键词
走滑断层/地震响应/断层识别/解释陷阱/克拉通盆地Key words
strike-slip fault/seismic response/fault identification/interpretation pitfall/Craton basin分类
天文与地球科学引用本文复制引用
邹禺,邬光辉,宋玉婷,黄天俊,杨博,马兵山,李国会,赵星星..克拉通内盆地走滑断层地震判识的若干陷阱[J].石油物探,2024,63(4):869-880,12.基金项目
中国石油—西南石油大学创新联合体科技合作项目(2020CX010101)资助.This research is financially supported by the Science and Technology Cooperation Project of Innovation Consortium of Petrochina and Southwest Petroleum University(Grant No.2020CX010101). （2020CX010101）
