塔里木盆地阿瓦提凹陷石油勘探前景预测

PREDICITON OF THE PETROLEUM EXPLORATION PROSPECT OF AVATI DEPRESSION IN TARIM BASIN

在系统研究塔里木盆地区域地质构造条件和沉积特征的基础上 ,深入分析了塔里木盆地阿瓦提凹陷石炭系生油岩的分布范围、母质类型、有机质丰度及成熟状况 ,同时结合塔里木盆地近年勘探中取得突破的 5套储盖组合情况 ,认为阿瓦提凹陷主要存在P1h P2s、C P1x两套储盖组合。而阿瓦提凹陷中的阿南断鼻构造带面积大、是凹中隆起 ,构造带上断背斜、断鼻构造发育 ,并且储油层与生油层间有断层勾通 ,容易捕获和聚集油气形成油气藏 ;阿南斜坡区虽然局部构造不发育 ,但处于油气运移的指向 ,也容易捕获和聚集油气形成油气藏。从而得出了阿南断鼻构造带和阿南斜坡区均是阿瓦提凹陷下步油气勘探的重点区带。为该区下步勘探部署提供了依据。

This paper studies the petroleum geologic characteristic of Avati Depression of Tarim Basin and analyzes its oil and gas condition and distribution rule. Combining with the 5 sets of reservoir and cap composition obtained in the exploration in recent years, it shows that Avati Depression mainly contains P1h P2s, C P1x 2 sets of reservoir and cap composition. Anan fault nose structure zone in Avati Depression has a large area. It is uplifted in the central part of the depression. Fault anticline and fault nose structures develop in the structure zone. There are faults connecting between reservoirs and oil generative beds. This is favorable for the formation of oil and gas into reservoir. Anan slope area is locally undeveloped with structure, but it locates in the direction of oil and gas migration. So it is also favorable for the formation of oil and gas reservoir. It concludes that Anan fault nose structure zone and Anan slope zone are the key areas for the further exploration.