双阳盆地三叠系煤系泥岩烃源岩特征与页岩气勘探潜力

摘要

Coal bearing stratum of fluvial facies and fluvial-lacustrine facies keeps developed in Triassic of Shuangyang basin, which shows coal-bearing source rock of exploration value.To study the Cheracteristic of coaly mudstone source rocks and shale gas exploration potential of Shuang yang basin, three types of samples in source rocks, including coal measures mudstone, carbonaceous mudstone and coal, have been collected in upper Triassic series from outcrop and Shuangshan 1.We study the organic abundance, including type and maturity of dark mudstones, carbonaceous mudstones and coals.The comprehensive evaluation result of Shuangyang basin is that the organic matter abundance reaches the organic abundance level of medium source rocks.The organic matter type is mainly type III, and the source rocks are in mature high mature stage, and the rock brittleness is higher.It can be used as a shale gas reservoir.In a word, the Triassic coal measures source rocks in Shuangyang basin have a certain hydrocarbon generating potential.It can become a shale gas reservoir with good oil and gas prospects.%双阳盆地三叠系发育一套河流-湖沼相的含煤地层,发育煤系烃源岩,构成一套有勘探价值的层系.为了研究双阳盆地三叠系煤系泥岩烃源岩特征与页岩气勘探潜力,在双阳盆地的双参1井和野外露头,采集了上三叠统的煤系泥岩、炭质泥岩和煤三种类型的烃源岩样品,进行了暗色泥岩、碳质泥岩以及煤的有机丰度、类型、成熟度和岩石学特征研究.结果表明:双阳盆地三叠系烃源岩有机质丰度达到中等烃源岩有机丰度水平,有机质类型主要是Ⅲ型,烃源岩处于成熟-高成熟阶段,岩层脆性较高,可以作为页岩气储层.总之,双阳盆地三叠系煤系烃源岩具有一定生烃潜力,而且可以成为页岩气储层,具有良好的含油气远景.