摘要
江汉平原前白垩系海相地层,厚4000—5000m,生储盖条件配套良好.其中、新生代块断活动的弱拉张改造区,油气保存条件好;印支期以来的隆起区,油气演化程度较低,有二次生油气条件.区内有三种油气成藏领域,即海相内幕构造、潜山及逆掩推覆体下盘.其中上组合弱拉张改造区的海相内幕布构造,是近期争取突破的最有利勘探区带。
Abstract
Precretaceous marine sediments(T-Z)in Jianghan Plain,being 1000—5000m thick,is in fine source-reservoir-cap rock assemblage.The main source rocks are platform biolithite of the Permian,Silurian,Ordovician,Cambrian,Sinian and dark mudrock in deep basin facies.The organic matter of the source rocks is highly matured and natural gas is the main product.The weak tension reformed areas of Cenozoic usually have fine hydrocarbon preservation condition while the uplifted areas formed after Indo-Chinese epoch are generally in lower organic matter evolution stage and have secondary oil-generation condition.The study area contains three kinds of hydrocarbon-pooling areas:intra-marine facies structures,buried hills and the lower walls of the overthrusts.The ex-ploration area ranges 3.74×10 km.Taking Silurian as the boundary,the marine sedi-ments form two source-reservoir-cap rock assemblages,the upper one,that is to say,the anticlinal structural zones in the central parts of Dangyang and Chenhu synclinoria arefavourable for recent hydrocarbon exploration.
论文详情