陆相盆地薄层泥岩盖层形成机制、特征与油气成藏关系——以辽东湾地区中南部为例

渤海海域辽东湾地区中南部近2年发现了一系列薄层泥岩作为有效盖层的油气藏。文章较全面地总结了薄层泥岩盖层特征及形成机制,在此基础上分析了薄层泥岩盖层与油气成藏的关系。通过系统研究得出如下结论:在圈闭形态良好的条件下,薄层泥岩盖层对油气藏具有良好的封盖作用;薄层泥岩质量对油气藏高度有明显的影响,而薄层泥岩盖层厚度与油气藏高度没有明显的关系;在相似薄层泥岩盖层条件下,随着圈闭形态的变好,油气藏高度变高。研究成果有助于拓宽勘探思路:在近物源储层发育的地方,虽然没有区域性盖层,只要圈闭形态良好也能找到大中型油气田。

THE FORMATION MECHANISMS AND CHARACTERISTICS OF THIN-LAYER MUDSTONE CAPROCK AND ITS RELATIONSHIP WITH HYDROCARBON ACCUMULATION IN THE TERRESTRIAL BASIN -AN EXAMPLE OF THIN-LAYER MUDSTONE CAPROCK IN THE SOUTH-CENTRAL LIAODONG BAY

A series of thin-layer mudstone caprock reservoirs have been found in the last two years in the south-central Liaodong Bay,Bohai offshore area.This paper comprehensively summarizes the formation mechanisms and characteristics of thin-layer mudstone caprock,and then analyzes the relationship between thin-layer mudstone caprock and hydrocarbon accumulation.Through systemic research,the following important conclusions are obtained.Under favorable trap shape condition,thin-layer mudstone caprocks have good seal...