东营凹陷民丰洼陷边界断层三维几何学及运动学特征  

3D geometrical and kinematic characteristics of boundary faults in Minfeng subsag,Dongying Sag,Bohai Bay Basin

作　　者：高丽明[1] 何登发[1] 桂宝玲[1] 王俊辉[1] 陈为佳[1] 

机构地区：[1]中国地质大学(北京)能源学院

出　　处：《石油勘探与开发》2014年第5期546-553,共8页Petroleum Exploration and Development

基　　金：国家油气科技重大专项"深层典型低渗含油气输导体识别与油气评价技术"(2011ZX05008)

摘　　要：在高精度三维地震资料约束和井资料控制下,通过二维及三维分析,对渤海湾盆地济阳坳陷民丰洼陷边界断层的几何学和运动学特征进行剖析。根据边界断层走向及倾角、倾向等特征,将研究区边界断层分为西、中、东3段,认为断面是由多个倾斜面以轴面连接而成的曲面,建立了其三维几何学形态模型。民丰边界断层断面可视为以6条横向轴面和4条垂向轴面连接的倾斜面,可划分为11个区。运用正断层转折褶皱理论,对民丰边界断层的运动学特征进行分析,并对西、中、东3段的平衡剖面进行对比,认为其在发育前期以旋转运动为主,后期以剪切正断层转折褶皱模式发育。民丰边界断层中段发育犁式正断层,而西、东段发育断坪,为座椅式正断层。西、中段断层活动强度受次级断层——胜北断层的影响,断层旋转程度由西向东减弱。在东营组沉积末期边界断层反转程度大致自西向东增大。Under the constraint of high-precision 3D seismic data and well data, through 2D and 3D analysis, the geometrical and kinematic characteristics of the boundary faults of Minfeng subsag, Jiyang depression, Bohai Bay Basin were analyzed. According to the strike, dip and dip-angle, the boundary fault of the study area is divided into three segments, i.e. west, center and east. It is thought that the fault surface is a curved surface consisting of several inclined surfaces linked by axial plane （i.e. transversal axial plane and vertical axial plane）, and a three-dimensional geometry model of the boundary fault was built. The Minfeng boundary fault surface is divided into 11 subzones by 6 transversal axial planes and 4 vertical axial planes. The kinematic characteristics of the Minfeng boundary fault were analyzed on the basis of the normal fault-bend folds theory, and the three balanced cross-sections in west, central and east segments are compared. It is concluded that the Minfeng boundary fault mainly experienced rotary motion in its early stage of development, and moved in the inclined shear fault-bend fold pattern in the late stage. There developed listric fault in the central segement, seat type normal faults in east and west segments of the Minfeng boundary fault. The activity intensity of west and central faults was affected by Shengbei fault, the rotation degree of Minfeng boundary fault weakens from west to east. The reverse degree of the Minfeng boundary fault increased from west to east at the end of the Paleogene Dongying Formation deposition.

关 键 词：东营凹陷 民丰洼陷 边界断层 三维 几何学特征 运动学特征 断层转折褶皱 平衡剖面 

分 类 号：TE122.1[石油与天然气工程—油气勘探]