库车坳陷东北部中侏罗统泥页岩储集层特征  

Shale Gas Reservoir Characteristics of Middle Jurassic in Northeastern Kuqa Depression,Tarim Basin

作　　者：肖飞[1,2] 刘洛夫[1,2] 高小跃[1,2] 任泽樱 吴康军[1,2] 肖正阳[1,2] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油大学盆地与油藏研究中心,北京102249

出　　处：《新疆石油地质》2014年第3期287-292,共6页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZH05018-002);国土资源部专项(2009GYXQ15-09-00);国家重点实验室项目(prp2009-02)

摘　　要：库车坳陷东北部中侏罗统发育一套典型的陆相泥页岩,是该区重要的烃源岩之一,具有良好的页岩气生气远景.利用X射线衍射、扫描电镜、氩离子抛光等测试手段对研究区暗色泥页岩储集层特征进行了研究.研究发现,富含有机质泥页岩的矿物组成以石英和黏土矿物为主,石英含量18％～55％,黏土矿物含量9％～76％,黏土矿物以伊蒙间层和伊利石为主;泥页岩孔隙度为0.5％～7.3％,渗透率多小于0.1mD,属于特低孔超低渗储集层;泥页岩主要发育纳米—微米级矿物基质孔和有机质微孔,以及构造微裂缝和成岩微裂缝等多种类型的储集空间.与北美典型含气页岩对比,库车坳陷东北部中侏罗统泥页岩具有相似的储集层特征,是页岩气的有利储集层.研究还发现,研究区中侏罗统暗色泥页岩储集层特征主要受矿物组成、成岩作用和构造作用影响.在此研究基础上,应进一步研究中侏罗统泥页岩含气性和岩石可改造性,为下一步勘探开发提供依据.The Middle Jurassic is one of major source rocks in the northeastern Kuqa depression for it has a typical continental shale, and it is of good potential of shale gas generation. The study of characteristics of the shale gas reservoir from X-ray diffraction, scanning electron microscope and argon-ion polishing techniques that its organic matter-rich shale mineral components are mainly composed of quartz （18%- 55%） and clay minerals （9%-76%）, the latter are dominated by illite/smectite mixed layer and illite, with the shale porosity of 0.5%-7.3% and permeability of less than 0.1mD, belonging to a supper-low porosity and ultra-low permeability reservoir; The shale reservoir spaces mainly include nano-micron mineral matrix pores, organic micro-pores, structural micro-fractures and diagenesis micro-fractures. Comparing with the typical gas-bearing shales in North America, the Middle Jurassic shale is of similar reservoir characteristics and could be faverable shale gas reservoir. Also, the research shows that the mineral composition, diagenesis and structural process mainly influence the characteristics of the reservoir in this area. It is suggested that the gas-bearing nature and the modifiable property of the Middle Jurassic shale are paid more attention to in next-step researches and further exploration and exploitation.

关 键 词：塔里木盆地 库车坳陷 中侏罗统 泥页岩 储集层特征 影响因素 

分 类 号：TE112.23[石油与天然气工程—油气勘探] TE122.22