南堡凹陷边界断层分段特征及其对沉积体系的控制作用  

Segmentation characteristic of boundary fault in Nanpu sag and its control on sedimentary system

作　　者：章惠[1] 孙思敏[2] 季汉成[2] 贾海波[2] 陈亮[2] 汤阳[2] 

机构地区：[1]中国石化石油物探技术研究院，江苏 南京 210014 [2]中国石油大学(北京)地球科学学院，北京 102249

出　　处：《油气地质与采收率》2016年第3期20-25,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"南堡凹陷油气富集规律研究与有利成藏区带预测"(2011ZX05006-006)

摘　　要：基于地震资料,应用垂直位移分析法,定量反演南堡凹陷西南庄断层的生长过程,认为该断层在南堡凹陷演化过程中表现为早期分段、晚期连接的特征。在沙河街组沉积初期,断层分段特征明显,各分段断层具有独立的正断层位移特征;至沙一段沉积时期—东营组沉积时期,各分段断层有连接的趋势,并最终连接为一条大型正断层。西南庄断层分段特征的差异性对研究区沉积体系的类型、展布具有重要的控制作用。断层演化过程中形成的最大断距处位于分段断层中央位置附近,控制半地堑的形成,易形成深湖—半深湖背景下的近岸水下扇沉积体系;断层分段点为各分段断层的连接部位,发育走向斜坡型和横向背斜型构造调节带,是砂体进入凹陷的主要物源通道,易形成扇三角洲沉积体系。On the basis of seismic data and vertical fault displacement method,the growth process of Xi’nanzhuang fault inNanpu sag was quantitatively inverted. It shows that the boundary fault had the characteristic of segmentation in the earlystage and jointed together in the later stage during the sag evolution period. The segmentation of the fault were apparent atthe beginning of the depositional period of the Shahejie Formation,and each segment had individual distribution of normalfault displacement. During the depositional period of the first member of Shahejie Formation,the segments showed thetrend of linkage and in the depositional period of the Dongying Formation,the segments finally linked together to become alarge fault. It also reveals that the spatiotemporal diversity of Xi’nanzhuang fault segmentation has great influence on sedimentary system of rifted-basin and its distribution. The maximum fault displacement formed by segmentation is at the center of fault,and controlled the formation of half graben where nearshore subaqueous fans easily developed under the background of half-deep lake and deep lake. Meanwhile,the segmentation points located where the fault segments connected,and structural accommodation zones of strike slope and transverse anticline developed as the main channels for sand bodybeing transported into the depression and thus facilitate the development of fan delta sedimentary system.

关 键 词：定量分析 断层分段 构造调节带 沉积体系 南堡凹陷 

分 类 号：TE111[石油与天然气工程—油气勘探]