塔里木盆地塔中地区东河砂岩圈闭含油气控制因素探讨

Approach to oil-gas bearing controlling factors of Donghe sandstone traps in Tazhong area of Tarim Basin

东河砂岩是目前塔里木盆地塔中地区勘探的主要目的层系。 本文通过对东河砂岩 地层展布、构造特征的介绍，对生、储、盖及圈闭条件及其配套条件等基本石油地质条件的 分析，阐明东河砂岩具有很大的勘探潜力。同时也指出印支—燕山期的左旋走滑断层对油藏 具破坏性；塔中中部的火成岩发育有利于油气聚集成藏；而塔中东部东河砂岩尖灭线对油 气的封堵性有待进一步落实。

Donghe sandstone is currently major target for explor ation in Tazhong area of Tarim Basin. Through introdu ction of distribution an d structural characters for Donghe sandstone formation and analysis of basic pet roleum geologic conditions (such as source rock, reservoir, cap formation, s eal condition and other necessary condition, etc), the paper considered that Donghe sandstone has a substantial exploration potential. At same time, the p aper also pointed out that left lateral strike slip fault in Indo China—Yan shan Mountain Stage does destruction to reservoir; igneous rock in central part of Tazhong area is favorable for oil gas accumulation. The oil sealing functi on of thin away line of Donghe sandstone in east part of Tazhong area is still wa iting for further determination.