地表剥蚀区之下的油气分布特点

The distributing traits of oil and gas under the earth's surface

目的:深化对地表剥蚀之下油气分布特点的认识。方法:通过大量调研,分析前人研究成果,得出综合性的分析结果。结果:地表岩层的不断剥蚀导致岩石孔隙空间增大,或者由于差异回弹导致岩层破裂、扩容,并使受压流体沿裂缝排出。下方砂,泥岩孔隙度和渗透率相对升高,地下油气就会向浅部运移,在地表显示异常。结论:地表剥蚀区之下的油气在地表有烃类异常和放射性异常。

Aim： Deepen the recogizaition of the distributing traits of oil and gas under the earth＇s surface. Methods ：Though collecting and analyzing the studies on the distributing traits of oil and gas under the earth＇s surface ,find the all-around analytic results. Results ：The propsity become biger because of the continuous denudation to the earth＇s surface, or because the discrepancy reelasticity make the terrane broken and biger, so the fluid vent. and the proposity and permeability of Sendston and mudrock under surface become higer,oil and gas may migrate to the surface,then there are abnormity on the surface. Conclusion：Oil and gas under the earth＇s surface have the abnormity of hydrocarbon and radioactivity.