塔里木喀什坳陷构造变形与油气关系探讨

喀什坳陷构造变形较为复杂,主要为喜山期构造变动的产物,受区域构造边界的影响及自身所处构造部位的差异,在区域南北向挤压应力场的作用下,于不同的地区形成了不同的构造变形区,自西向东、自北向南可分别称之为西部对冲挤压变形区、东段北部反冲挤压变形区、东段中南部侧向挤压凹陷区和中部剪切扭动变形区。下第三系底部膏盐层为底板滑脱层的逆冲推覆构造极为发育,属薄皮构造,并构成周边造山带向前陆地区逆冲推覆的前展式逆冲前缘或前缘外带的反冲褶皱带。区内构造变形的分区性和浅层构造变形的分异性对该区油气运移、聚集成藏具有重要作用。

The Relationship Between Structural Deformation and Hydrocarbon in Kashi Depression,Tarim Basin

The complex structural deformation in Cashi depres-sion was the product of thrust nappe structural movement.As a result of NS trend regional compressive stress field,several structural deformation zones developed in different regions under the influence of regional structural boundary and the differences of structural locations.From west to east and from north to south,there exist a ramp compres-sion deformation zone in the western area,a recoil com-pression deformation zone in the northern part of the east-ern area,a lateral compression depression zone in the cen-tral and southern part of the eastern area and a shear wrench movement deformation zone in the central part of the eastern area.The highly developed thrust nappe struc-ture with a gypsum layer at the bottom of Neogene acting as floor detachment surface is a thin-skinned structure and form the advancing thrust front or the recoil fold belt of frontal outer zone.The regionalization of structural defor-mation and differentiation of shallow structural deformation have large influence on hydrocarbon migration and accumu-lation in this region.