准噶尔盆地车莫古隆起侏罗系剥蚀厚度恢复

车莫古隆起位于准噶尔盆地腹部，为一个南西-北东走向的燕山期古隆起，现今构造为由北向南倾斜的单斜。该区侏罗纪经历了多期构造运动，发育多个削蚀和上超不整合面，是地层岩性油气藏勘探的有利地区。通过地层剥蚀厚度恢复主要方法与相关条件的分析,根据研究区实际地震资料特征，采用地震剖面直接追踪法、参考层厚度变化率法和邻层厚度比值法，对车莫古隆起区侏罗系头屯河组、西山窑组、三工河组的剥蚀厚度进行了恢复，其最大剥蚀量均分布在奎屯-莫索湾一带，各层最大剥蚀厚度为260 m、340 m和140 m。其中古隆起高部位的西山窑组剥蚀量可能是由两期构造运动造成的，三工河组剥蚀量的产生可能来自后期构造运动。通过分析剥蚀厚度平面分布特征与古隆起形成、演化之间的关系,指出早侏罗世末期是车莫古隆起的雏形期，西山窑组沉积期是车莫古隆起的逐渐发育时期，侏罗纪末期是车莫古隆起快速发育时期。大量剥蚀产物的搬运为古隆起翼部斜坡区地层岩性圈闭的形成创造了条件，车莫古隆起南部斜坡区是油气聚集的有利地区。

Recovery of eroded thickness of the Jurassic of Chemo palaeouplift in Junggar Basin

The Chemo palaeouplift is located in the interior of the Junggar Basin. It is oriented in SW-NE direction which was formed in the Yanshanian Orogeny. Now it is a monocline with a north to south inclination. The Jurassic of the study area experienced a multi-stage tectonic movements. Many truncations and onlap unconformity surfaces were developed, thus the study area is profitable for exploration of lithologic petroleum accumulations. By analyses on the eroded stratigraphic thickness and according to the seismic profiles characters, the eroded thickness of the Toutunhe, the Xishanyao and the Sangonghe formations of the Jurassic in the Chemo palaeouplift are reconstructed using the direct seismic profile indexing method combined with the thickness viriation ratio method and the neighboring thickness ratio method. The most intensive erosion occurred in the Kuitun-Mosuowan area, and the largest eroded thickness is 260 m, 340 m, and 140 m respectively for the three formations. The eroded thickness of the Xishanyao Formation in the high palaeouplift was probably formed by two-stage tectonic movements, while the eroded thickness of the Sangonghe Formation in the higher palaeouplift was probably from the tectonic movement in the later period. The relationship between the planar distribution characters of the eroded thickness and the formation and evolution of the palaeouplift indicate the late Early Jurassic is the initial forming period of the Chemo palaeouplift, the sedimentary period of Xishanyao Formation is its developing period, and the Late Jurassic is its extensively developing period. The transportation of a great deal of eroded sediment provided the conditions for the lithologic trap formation on the slope area of the palaeouplift. The southern slope area of the Chemo palaeouplift is the profitable petroleum accumulation area.