南海西南部西纳土纳盆地中部走滑构造带分段性及对油气控制作用  

Strike-slip Structures Segmentation and Its Control of Hydrocarbon Accumulation in Middle Part of the West Natuna Basin

作　　者：毕素萍[1] 潘懋[2] 夏朝辉[3] 张铭[3] 张文起[3] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]北京大学地球与空间科学学院,北京100871 [3]中国石油勘探开发研究院,北京100083

出　　处：《地质论评》2016年第3期770-778,共9页Geological Review

基　　金：国家重大专项"海外重点风险项目勘探综合配套技术"(编号:2011ZX05029)资助的成果~~

摘　　要：为了研究南海西南部印度尼西亚纳土纳群岛西侧西纳土纳盆地走滑构造特征及对油气的控制作用,对研究区三维地震资料进行了精细分析,并结合切片和剖面特征对走滑构造进行了刻画。研究表明盆地中部中新世晚期发育北西向右旋走滑构造,由南东向北西,构造特征存在明显差异,根据其平面、剖面特征及活动强度分为东段、中段和西段。东段平面上为平直的、贯通的主干走滑断裂和雁列断层组,剖面上为花状构造;中段平面上为S型贯通的主干走滑断裂和雁列断层组,剖面上为花状构造;而西段平面上为雁列构造,没有贯通的主干走滑断裂,剖面上主要为断阶组合。推测走滑构造的分段性受走滑强度、断层几何形态和盖层厚度的影响,并对圈闭形成和油气运移、聚集具有明显的控制作用。Objectives： The strike slip faults had played important role in the development of West Natuna basin offshore Indonesia,however,detailed characteristics of the strike slip structures are not known. The fault segmentation and control of hydrocarbon distribution was studied.Methods： 3D seismic data interpretation was carried out to study the fault deformation characteristics in cross section and horizontal section. Based on oilfield data,hydrocarbon accumulation features and the relationship with the segmentation were analyzed.Results： The study indicates that NW dextral strike-slip structures were developed in the central basin during late Middle Miocene,and the deformation styles change from SE to NW,which can be divided into east,middle and west segments. Each segment has distinct deformation characteristics in the horizontal and cross sections and hydrocarbon accumulation features. The east segment is composed of a straight master fault and several set of en echelon faults with flower structures,and the hydrocarbon is mainly accumulated in fault trap in lower section through strike slip fault; the middle segment is characterized by a type S main strike slip fault with several set of en echelon faults,and the hydrocarbon is accumulated in fault trap in upper section through strike slip faults; the west segment is characterized by several set of en echelon faults which formed fault terrace zones without a master fault,and the hydrocarbon is mainly accumulated in faulted anticline in upper section through inversion and en echelon faults. The segmentation may be caused by deformation intensity,fault geometry and formation thickness.Conclusions： The strike-slip structures can be divided into three segments,and each segment has distinct hydrocarbon accumulation features due to different trap type and migration pathways.

关 键 词：南海西南部西纳土纳盆地 走滑构造带 花状构造 雁列断层 分段性 油气成藏 

分 类 号：P618.13[天文地球—矿床学]