阿尔及利亚A区块三叠系油气成藏条件与富集控制因素

Hydrocarbon accumulation conditions and enrichment controlling factors of Triassic in block A,Algeria

三叠系是阿尔及利亚A区块最有利的勘探目的层。通过对志留系烃源岩的评价分析、三叠系储层特征研究,以及圈闭条件、盖层保存条件和油气成藏时空配置条件等的综合研究,认为A区块控制油气成藏的因素有2个方面:一是烃源条件及有效的油气运移通道是决定A区块油气是否成藏的直接因素;二是储层的储集性能决定油气的富集程度。从已发现油藏实例剖析,本区的油气勘探应把握近油源的原则,在构造精细解释及储层反演、微裂缝预测的基础上,解决好储层和圈闭这2个影响油气勘探的关键因素。

Triassic is the most promising target for oil/gas exploration in block A, Algeria. The research on its hydrocarbon accumulation conditions and enrichment controlling factors is of great significance for oil/gas exploration within the block. Based on the comprehensive study on evaluation of Silurian source rock, characteristics of Triassic reservoir and such basic petroleum geologic conditions as trap condition, cap rock as well as preservation condition and time and space conditions of hydrocarbon accumulation, it is pointed out that the factors controlling hydrocarbon accumulation in block A, Algeria are hydrocarbon source conditions, the difference in the quality of reservoirs and the effectiveness of gas migration. Oil/gas exploration in block A, Algeria should adhere to the principle of near hydrocarbon source and deal with the two key factors of reservoirs and traps on the basis of fine logging interpretation, reservoir inversion and micro-fracture prediction.