收稿日期: 2013-11-06
修回日期: 2014-03-22
网络出版日期: 2014-06-10
基金资助
Study on Micropore Structure Characteristics of Longmaxi FormationShale Gas Reservoirs in the Southern Sichuan Basin
Received date: 2013-11-06
Revised date: 2014-03-22
Online published: 2014-06-10
应用扫描电子显微镜、高压压汞法、N2和CO2气体吸附法,对川南地区下志留统龙马溪组海相页岩气储层孔隙微观特征和孔隙结构进行了研究,探讨了页岩孔隙发育的主要影响因素。结果表明,川南地区龙马溪组海相页岩样品中发育多种类型微观孔隙,常见有黏土矿物粒间孔、黄铁矿晶间孔、碳酸盐颗粒溶蚀孔、生物碎屑粒内孔、颗粒边缘溶蚀孔和有机质孔;龙马溪组富有机质页岩发育大量的微米—纳米级孔隙,为页岩气赋存提供了储集空间。龙马溪组页岩样品中孔隙以微孔和介孔为主,宏孔较少;孔隙结构形态主要为平板狭缝型孔、圆柱孔和混合型孔,孔径为0.4~1nm、3~20nm;微孔和介孔占孔隙总体积的78.17%,占比表面积的83.92%,是龙马溪组页岩储气空间的主要贡献者。页岩有机碳含量、成熟度和矿物成分含量均会影响川南地区龙马溪组海相页岩孔隙的发育,总体上页岩孔隙体积随有机碳含量增加而增大;页岩孔隙度随成熟度增加而降低;黏土矿物和脆性矿物含量对页岩孔隙发育也有一定的影响。
赵佩,李贤庆,田兴旺,苏桂萍,张明扬,郭曼,董泽亮,孙萌萌,王飞宇 . 川南地区龙马溪组页岩气储层微孔隙结构特征[J]. 天然气地球科学, 2014 , 25(6) : 947 -956 . DOI: 10.11764/j.issn.1672-1926.2014.06.947
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