贵州下志留统龙马溪组页岩气成藏条件分析  

Accumulation conditions of shale gas from Lower Silurian Longmaxi Formation in Guizhou

作　　者：张鹏[1,2] 张金川[1] 刘鸿[2] 黄宇琪[2] 吕艳南[1] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]六盘水师范学院矿业工程系,贵州六盘水553004

出　　处：《中南大学学报（自然科学版）》2016年第9期3085-3092,共8页Journal of Central South University:Science and Technology

基　　金：六盘水师范学院搞高层次人才科研启动基金资助项目(LPSSYKYJJ201505);国家自然科学基金资助项目(41272167)~~

摘　　要：针对贵州地区页岩气成藏条件复杂的问题,从钻井、岩芯、露头样品等实验测试资料出发,以下志留统龙马溪组页岩为研究对象,对贵州地区龙马溪组海相页岩气成藏条件进行研究。研究结果表明:贵州地区龙马溪组潜质页岩主要形成于深水陆棚沉积环境,其特点为潜质页岩厚度大,有机碳质量分数高(潜质页岩段平均w(TOC)>4%),有机质类型为Ⅰ型和Ⅱ1型,有机质热演化程度处于成熟—过成熟阶段,页岩中脆性矿物质量分数高,孔隙度中等,含气量高。通过与成功勘探开发页岩气的北美以及四川盆地的成藏条件相比,认为贵州地区下志留统龙马溪组具有良好的页岩气成藏条件,且龙马溪底部炭质页岩段是页岩勘探的目标层系,并预测了其页岩气富集有利区。With the Lower Silurian Longmaxi Formation shales being the research object, the accumulation conditions of marine shale gas of Longmaxi Formation in Guizhou were studied based on the results of drilling, experimental test results of core samples and outcrops given to the complexity for shale gas accumulation conditions of Guizhou. The results show that Longmaxi Formation black shales in this region are mainly formed in shelf sedimentary facies, with the features of having great organic-rich shale thickness, and high organic mass fraction （the potential of shale section average w（TOC）〉4%）; organic matters are of type I and II1; organic matter thermal evolution level is in high-over; the shales are rich in brittle mineral, and have medium porosity and high gas content. Compared with the shales in North America which is explored and developed successfully. The Lower Silurian Longmaxi Formation has good accumulation conditions for shale gas. Therefore, the bottom of Longmaxi Formation is considered as the protential target for shale gas exploration, and the favorable areas of shale gas enrichment are also predicted.

关 键 词：页岩气 成藏条件 潜质页岩 有利区 

分 类 号：TE122[石油与天然气工程—油气勘探]