塔里木盆地巴楚组沉积格局与演化

通过对塔里木盆地巴楚组沉积格局与沉积演化的剖析，试图为巴楚组有利储集砂体和储盖组合预测提供新的思路。根据穿时普遍性原理认为巴楚组的东河砂岩段和下泥岩段为全盆地范围内穿时的岩石地层单元，生屑灰岩段可视为良好的时间－岩性标志层。以沉积大地构造背景分析为基础，指出塔里木盆地包含了克拉通边缘拗陷和克拉通内拗陷两个原型盆地，大地构造运动造成的西低东高的古地形以及自西向东的渐进式海侵，控制了塔里木盆地内巴楚组的沉积格局和沉积发育史。结合沉积相的精细解释，将巴楚组划分为四个沉积演化阶段：初期为初始海侵沉积阶段，早期是碎屑滨岸—陆棚发育阶段，中期主要为浅海碎屑陆棚发育阶段，晚期以发育碳酸盐岩台地沉积阶段为特色。

DEPOSITIONAL FRAMEWORK AND EVOLUTION OF BACHU FORMATION IN TARIM BASIN

the analysis of depositional framework and evolution of Bachu Formation in Tarim Basin, the authors of the paper attempt to provide a new idea for a favorable sandbody and the prediction on assemblage of reservoir and cap beds. According to the principle of ubiquity of diachronism, it is recognized that the Donghe Sandstone Member and Low Mudstone Member of Bachu Formation are a diachronism lithostratigraphic unit of the total basin range and that bioclastic limestone can be considered as a precise time lithologic criteria. Taking the analysis of sedimentary tectonic background as the foundation, it is indicated that there are two Prototype basins in Tarim Basin, including cratonic margin depression and intracratonic depression. The depositional framework and development of Bachu Formation in Tarim Basin have been controlled by the ancient landform elevation caused by tectonic movement with high in the east and low in west, and progressive sea transgression from west to east. Combining with fine interpretation of sedimentary facies, Bachu Formation may be divided into four depositional evolution stages: initial sea transgression in primary stage, clastic shore and shelf development in early days, clastic shallow shelf development in medium time, carbonate platform deposition in an advanced stage.