引起油气藏破坏与再分配的地质因素分析

ANALYSIS ON GEOLOGICAL FACTORS CAUSING THE DESTROY AND REDISTRIBUTION OF OIL AND GAS RESERVOIRS

在前人工作的基础上,从地壳抬升剥蚀、断裂活动、地下水活动和天然气扩散四个方面对油气藏的破坏机理及实例进行了分析。认为:地壳抬升剥蚀和断裂活动是造成油气藏破坏的根本原因,其中地壳抬升和断至地表的开启断层可造成油气藏的严重破坏,未断至地表的开启断层虽不能造成油气藏的破坏,但却可以引起油气的再分配,使原生油气藏规模减小;地下水活动对油气藏的破坏应以地壳抬升剥蚀和断裂活动为前提条件,一方面地下水活动可直接冲刷油气藏使其发生破坏,另一方面可以促进氧化和菌解作用使油气藏发生破坏;天然气扩散作用使气藏储量逐渐减小,以至估竭。

Based on summering predecessors work, this paper analyses the destroy mechanism of oil and gas reservoirs and their actual examples through the four aspect of uplift and denudation of crust, activity of faults, movement of underground water and gas diffusion. Considers uplift and denudation of crust and activity faults to be the basically cause that oil and gas reservoirs had been distracted uplift of crust and opened faults that can fault to the surface can't destroy oil and gas reservoirs, but is can cause the secondary distribution of oil and gas. Reduce the scale of original oil and gas reservoirs. The destroy of movement of underground water to oil and gas reservoirs is decided by upiilt and denudation of crust and activity of faults. It can directly destroy oil and gas reservoirs by washing- It can also destroy oil and gas reservoirs by promoting oxidation and bacteria degradation. Gas diffusion makes reserves of gas reservoirs decrease and exhaustion.