库车坳陷天然气藏成藏条件分析

本文通过对库车坳陷石油地质特征的综合分析,指出库车坳陷具有良好的天然气成藏条件。库车坳陷气源丰富,具有形成大气田的有利气源条件。断裂对气藏的形成具有重要的控制作用。断裂勾通深部气源和浅部储集层,是天然气垂向运移的主要通道。成藏期晚和第三系欠压实泥岩形成大面积的压力封盖,有利于天然气的保存。库车坳陷天然气生成、运移、聚集、圈闭形成等诸要素配置较好,有利于大中型气田的形成,是塔里木盆地寻找大中型气田的有利地区。

ANALYSIS ON THE POOL-FORMING CONDITIONS OF NATURAL GAS ACCUMULATIONS IN THE KUQA DEPRESSION

By comprehensive analysis on the characteristics of petroleum geology in the Kuqa Depression in this paper, it is pointed out that the Kuqa Depression has good pool forming conditions for natural gas. The Kuqa Depression is rich in gas sources, and has favorable gas source conditions to form giant gas fields. Fractures play an important controlling role in the formation of gas accumulations. They link deep gas sources to shallow reservoirs, and are main pathways for the vertical migration of natural gas. Late pool forming periods and the Tertiary undercompacted mudstone forming large area of pressure sealings are advantageous to the preservation of natural gas. The generation, migration, accumulation, trap formation and other essential factors of natural gas in the Kuqa Depression are well disposed. This is advantageous to the formation of large medium scale gas fields. Therefore, it is the favorable area in the Tarim Basin for prospecting large medium scale gas fields.