断层静止期同一断裂带封油封气的差异性研究

Theoretical and Experiment Research on the Difference between the Seal Oil Ability and the Seal Gas Ability of Fault Zone in the Static Period of Fault

付　广　孟庆芬

Fu Guang，Meng Qingfen

大庆石油学院

Daqing Petroleum Institute , Daqing 163318 ,China

在断裂带封闭机理及油气物理性质差异分析的基础上,对断层静止期断裂带封闭油和天然气的差异性进行了理论分析和实验研究,得到在相同条件(封闭相同油气柱高度)下,断裂带封油能力较其封气能力强。实验结果表明,在相同油气柱高度条件下,断裂带封闭天然气所需要的粘土含量明显较其封闭油所需要的粘土含量高,也说明了断裂带封油能力较其封气能力强。在相同动力条件下,天然气通过断裂带的运移速度较原油通过其运移速度快,表明断裂带滞留油的能力较其滞留气的能力强。

Based on the analysis of seal mechanism of fault zone in the static period of fault and the difference between physical property of oil and that of gas , this paper analyzed theoretically and studied experimentally the difference between seal oil ability and seal gas ability of fault zone. This paper considered in the condition of sealing the same oil and gas column the seal oil ability of fault zone is stronger than the seal gas ability of fault zone. Experiment results indicate that the mudstone content of fault zone required in sealing gas is more than the mudstone content of fault zone in sealing oil in the same oil and gas column . It indicates that the seal oil ability of fault zone is stronger than the seal gas ability of fault zone . The migration velocity of gas through fault zone is bigger than that of oil through fault zone , in the same condition of dynamic force ,it indicates that the remaining oil ability of fault zone is stronger than the remaining gas ability of fault zone.