徐家围子断陷控陷断裂活动特征及其对断陷的控制作用  

Activity characteristics of the depression-controlling faults and their controlling actions on Xujiaweizi Fault Depression

作　　者：牛文[1] NIU Wen(Exploration and Development Research Institute of Daqing Oilfield Co Ltd., Daqing 163712, China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院

出　　处：《大庆石油地质与开发》2019年第4期38-44,共7页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司重大科技专项“大庆油气持续有效发展关键技术研究与应用”(2016E-02)

摘　　要：徐家围子断陷是深层天然气勘探的重要领域,控陷断裂的活动性决定了徐家围子断陷的形成。为了搞清徐家围子断陷控陷断裂的活动性及其对断陷的控制作用,在三维地震剖面的解释、断面产状、断距解剖、断陷结构及地层厚度分析的基础上进行了系统研究。结果表明:徐家围子断陷发育北东向、北北东向和北西向控陷断裂,其控制了徐家围子断陷的沉积和断陷的发育;控陷断裂活动具有多期性,各个沉积时期的控陷断裂活动强度具有分段性和完整性;控陷断裂的活动特征决定了徐家围子断陷结构差异,南部为不对称双断式断陷,中部为复式箕状断陷,北部为箕状断陷;沙河子组沉积时期徐家围子断陷发育宋西、徐西、徐中和徐东4条控陷断裂,在火石岭组、沙河子组沉积时期活动;沙河子组沉积时期盆地具有由小变大的趋势,沉降中心沿控陷断层下降盘呈珠串状展布。Xujiaweizi Fault Depression is the important field of deep natural gas exploration, the activity of the depression-controlling fault determines the formation of Xujiaweizi Fault Depression. In order to clarify the activity of the subsidence-controlling fault in Xujiaweizi Fault Depression and its controlling action on the depression, the systematical study was conducted on the bases of the interpretation of three-dimensional seismic profiles, the occurrence of the cross-sections, the anatomy of the fault spacing, the structure of the depression and the analysis of the stratum thickness maps. The results show that there are NE, NNE and NW trending subsidence-controlling faults in Xujiaweizi Fault Depression, which control the deposition and development of Xujiaweizi Fault Depression;the activities of the subsidence-controlling faults possess multistage property, and the activity intensity of the subsidence-controlling faults in each sedimentary period is piecewise and integral;the activity characteristics of the subsidence-controlling faults determine the difference of the structure of Xujiaweizi Fault Depression, the asymmetric double-fault depression is in the south part, the complex dustpan fault depression is in the central part and the dustpan fault depression is in the northern part;during the sedimentary period of Shahezi Formation, four subsidence-controlling faults, namely Songxi, Xuxi, Xuzhong and Xudong faults were developed in Xujiaweizi Fault Depression, which continued to move during the sedimentary period of Huoshiling Formation and Shahezi Formation;during the sedimentary period of Shahezi Formation, the basin tended to grow from small to large, and the subsidence centers were distributed in beads along the descending wall of the depression-controlling faults.

关 键 词：徐家围子断陷 箕状断陷 控陷断裂 活动性 

分 类 号：TE121.2[石油与天然气工程—油气勘探]