鄂尔多斯盆地中生界及上古生界页岩孔隙类型及特征研究  

Study on types and features of the pore in Mesozoic and upper Palaeozoic shales in Ordos Basin

作　　者：袁野[1] 赵靖舟[1,2] 耳闯[1,2] 王芮[1] 魏之焜 沈武显[1,2] 

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《西安石油大学学报（自然科学版）》2014年第2期14-19,6-7,共6页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家科技重大专项"鄂尔多斯盆地及周边页岩气资源评价"(编号:2011ZX050l8001-004);陕西省自然科学基金项目"鄂尔多斯盆地延长组陆相富有机质页岩孔隙特征及其控制因素"(编号:2013JQ5003)

摘　　要：利用场发射扫描电镜对鄂尔多斯盆地中生界和上古生界的泥页岩孔隙特征进行观察,发现3种孔隙类型:①粒间孔,以黏土矿物间孔隙为主;②粒内孔,包括黏土矿物间孔隙、黄铁矿晶间孔和溶蚀孔;③裂缝,包括微裂缝和宏观裂缝。粒间孔和粒内孔是有效的页岩气储集空间,大量的微米—纳米级微裂缝是页岩气渗流的主要通道。由于热演化程度和干酪根类型的影响,有机质孔发育较少。The features of the pore in Mesozoic and upper Palaeozoic shales in Ordos Basin are observed using the field emission scanning electron microscopy,and it is found that there are three types of pores:( 1) inter-grain pores,being mainly the pores among clay mineral particles;( 2) intragranular pores,including the pores among clay mineral intergranular pores,pyrite intergranular pores and corrosion pores;( 3) fractures,including micro-fractures and macro-fractures. The inter-granular pores and intra-granular pores are effective reservoir space for shale gas,and a large number of micron-nanometer microfractures are the seepage channels of the shale gas. There is less organic matter pores due to thermal evolution degree and kerogen types.

关 键 词：页岩气 孔隙 裂缝 场发射扫描电镜 中生界 上古生界 鄂尔多斯盆地 

分 类 号：TE122[石油与天然气工程—油气勘探] P618.130.2[天文地球—矿床学]