摘要
负反转构造在自然界中是普遍存在的,研究负反转构造的几何学特征和发育特征,对认识区域地质和对油气的勘探开发都具有重要意义。本文通过对三维地震剖面进行解析,在句容盆地发现中生代存在典型的负反转构造,并理清了该地区中生代的构造演化过程。通过对剖面的一系列分析发现:句容盆地在中三叠世末—早、中侏罗世的印支运动是挤压构造环境,中晚侏罗世的燕山早期是挤压的构造环境,到晚白垩世—古近纪的燕山晚期的构造运动,区域应力场从挤压变为伸展,形成一系列的伸展盆地,造成了句容盆地的构造反转;句容盆地白垩纪—第四纪地层的沉积由负反转断层控制,形成北断南超的盆地构造形式。负反转构造的主要起始时间为白垩纪中晚期,反转强度较大,周围地区反转构造不发育。燕山晚期的伸展运动对油气圈闭的影响不是完全破坏性的,在此地区可能有较好的油气圈闭的,在最下部层位的高家边组泥岩盖层,此套地层厚度大,只要不受断层的切割,就能对油气形成良好的封堵作用,可作为下古生界圈闭的区域性盖层。
The negative inversion structure is widespread in the field,and the study of geometry and development features of negative inversion structure is very important to recognize the regional geology,oil and gas exploration and development.By the analysis of the 3D seismic profiles and combining with the previous work,constrained geological outcrops and drilling data,the typical negative inversion structure has been found in the Jurong basin,which has a series of characteristics：firstly,the analysis of the 3D seismic section of the basin,reflects the compressional tectonic environment during the Indonesian Period and the early Yanshanian Period and the extensional tectonic environment which formed a series of extensional basin during the late Yanshanian Period;Secondly,the sedimentary formation of Cretaceous-Quaternary was controlled by the negative inversion structure which formed a basin whose north side is faulted and south side overlapped.The faults around of the negative inversion structure aren＇t inverted because the extensional stress is absorbed by the negative inversion structure in the middle and late Cretaceous;Thirdly,the extensional event in the late Yanshanian Period isn＇t entirely destructive to the traps of oil and gas,given the good shows of oil and gas around the negative inversion structure.The strata at the bottom of Gaojiabian formation mudstone caprock are very thick and can be regional cap formations,if the layers aren＇t destructed by the faults.
出处
《地质论评》
CAS
CSCD
北大核心
2015年第5期1047-1060,共14页
Geological Review
基金
江苏省科技项目(编号BE2013115)的成果
关键词
句容盆地
负反转构造
三维地震剖面
正演模拟分析
油气运移
Jurong basin
negative inversion structure
3D seismic profile
forward modeling
oil-gas migration
