川东地区下三叠统嘉陵江组储层沥青的油源

用色谱-质谱分析方法鉴定出川东地区下三叠统嘉陵江组储层沥青饱和烃和芳烃馏分中的生物标志物,研究了生物标志物特征及热演化特征,其中以藿烷系列和规则甾烷系列丰度高为最主要特征。上二叠统长兴组和龙潭组烃源岩与该储层沥青具有相似的生物标志物指纹特征及热演化特征,普遍存在γ-胡萝卜烷、β-胡萝卜烷和伽马蜡烷,因此认为它们是该储层沥青的主要烃源岩。

Source of Bitumen in Lower Triassic Jialingjiang Reservoir in Eastern Sichuan Basin

Genesis and prediction of carbonate reservoirs has been one of the hot spots of petroleum exploration and geology research.It is shown that deposition of carbonate reservoirs is mainly related to the environments of the barrier island and the edge zone behind it and is controlled by the atmosphere fresh water leaching,dolomitization,paleokarstification,buried dissolution and so on in Tarim,Ordos and Sichuan Basins.The carbonate reservoirs can be divided into four types:(a) atmosphere freshwater leaching reef and shoal limestone reservoir,(b) paleokarstified reef and shoal limestone reservoir,(c)dolomitizied reef and shoal dolostone reservoir and(d)paleokarstified anhydrite dolostone reservoir in these mentioned basins.A comprehensive genesis-prediction model of barrier-related carbonate reservoir is put forward.The reef and shoal zone along platform edge that builds the barrier island is the areas favorable for(a) to(c) typed reservoirs,while the edge flat zone of evaporation basin behind the berrier island is the area favorable for(c) typed reservoir.