摘要
基于三维地震资料与钻井岩心资料,采用地震-地质解析方法和断层充填碳酸盐胶结物U-Pb定年的年代学方法,综合分析四川盆地中部地区深层走滑断层的形成时期、演化及其成因机制。研究表明:走滑断层在晚震旦世形成雏形,并在早寒武世基本发展为右行张扭断裂系统,在二叠系沉积前叠加至少一期压扭构造变形,在晚二叠世反转为左行弱张扭断裂系统,仅极少数在印支期及以后选择性复活;走滑断层受南华纪裂陷正断层和北西向基底深大断层等先存构造影响,震旦纪末—早寒武世属于斜向板内变换断层,调节德阳—安岳槽盆北强南弱的不均匀伸展,与德阳—安岳槽盆演化具有时间与强度上的匹配性,后期在不同构造背景下发生多次反转及选择性活化。
Based on 3D seismic and drilling data,the timing,evolution and genetic mechanism of deep strike-slip faults in the central Sichuan Basin are thoroughly examined by using the U-Pb dating of fault-filled carbonate cement and seismic-geological analysis.The strike-slip fault system was initially formed in the Late Sinain,basically finalized in the Early Cambrian with dextral transtensional structure,was overlaid with at least one stage of transpressional deformation before the Permian,then was reversed into a sinistral weak transtensional structure in the Late Permian.Only a few of these faults were selectively activated in Indosinian and later periods.The strike-slip fault system was affected by the preexisting structures such as Nanhua rifting normal faults and NW-striking deep basement faults.It is an oblique accommodated intracratonic transfer fault system developed from the Late Sinian to Early Cambrian to adjust the uneven extension of the Anyue trough from north to south,and matches the Anyue trough in evolution time and intensity.In the later stage,multiple inversion tectonics and selective activation occurred under different tectonic backgrounds.
作者
马兵山
梁瀚
邬光辉
唐青松
田威振
张晨
杨率
钟原
张旋
张自力
MA Bingshan;LIANG Han;WU Guanghui;TANG Qingsong;TIAN Weizhen;ZHANG Chen;YANG Shuai;ZHONG Yuan;ZHANG Xuan;ZHANG Zili(School of Geosciences and Technology,Southwest Petroleum University,Chengdu 610500,China;PetroChina Southwest Oil&Gas Field Company,Chengdu 610051,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2023年第2期333-345,共13页
Petroleum Exploration and Development
基金
中国石油-西南石油大学创新联合体科技合作项目(2020CX010101)
国家自然科学基金(91955204)。
