天然气运移地球化学示踪方法及其应用

Methods and Applications of Geochemical Trace for Natural Gas Migration

天然气在运移过程中,有多种地化指标发生规律性的变化。通过总结前人关于天然气运移地球化学指标的研究,在此基础上应用部分指标判断了东濮凹陷的文23气田天然气的运移方向。研究表明,从前梨园洼陷深部生成的煤成气首先以文东断层为气源断层向上运移,然后以文105断层与Es4储集砂层交汇处为天然气充注点,沿着储集层砂体主要向西北方向运移,最终在构造高部位聚集成藏。

Many geochemical indices change regularly in the course of natural gas migration. This paper reviews previous researches on geochemical indices of gas migration, by which the gas migration direction of Wen-23 gasfield in Dongpu sag is judged with some indices. The result shows that the coal-formed gas from deep Qianliyuan sub-sagin migrated upward firstly along Wendong fault, then northwestward along Wen-105 fault and Es4 reservoir sands, and finally accumulating into gasfield in structural highs.