论文部分内容阅读
根据区域性盖层的发育特征，从不同侧面对其在油气聚集与保存中所起的作用进行了深入分析，认为区域性盖层通常是阻止游离相油气逸散的良好区域物性屏障；如果其欠压实，具异常孔隙流体压力，它还可以成为阻止水溶相油气逸散的区域压力屏障；如果其再具生烃能力，还可以成为阻止扩散相天然气逸散的区域浓度屏障。油气藏形成后，区域性盖层又可成为阻止地表水淋滤和细菌氧化对油气藏破坏的区域保护层。
According to the developmental characteristics of regional cap rocks, the effects of caprock on hydrocarbon accumulation and preservation are analyzed from different aspects, and the regional cap rocks are usually considered as good physical barriers to prevent the escape of free phase hydrocarbons. Under-compacted, with abnormal pore fluid pressure, it can also act as a regional pressure barrier that prevents the escape of oil-water phases in the water-soluble phase; it can also act as a regional concentration barrier to prevent the escape of natural gas in the diffusive phase if it is more hydrocarbon-generating. After the formation of oil and gas reservoirs, the regional cap layer can become a regional protective layer that prevents surface water leaching and bacterial oxidation from damaging the oil and gas reservoirs.