摘要
以单井储层地质分析为基础,结合样品实验测试分析、露头资料和前人研究成果,从页岩地球化学特征、岩矿特征和储层条件等方面对鄂尔多斯盆地三叠系延长组长7油层组页岩储层特征进行了研究。长7油层组主要为深湖-半深湖沉积相;富有机质页岩主要分布在盆地南部,在下寺湾-富县一带和盐池-姬塬一带厚度最大;自南缘渭北隆起向西北埋深逐渐加大,埋深<2.5km。有机质类型以Ⅰ型为主,其次为Ⅱ型,有机碳质量分数为0.51%～22.6%,Ro分布于0.7%～1.2%。岩性以黑色纹层状页岩、粉砂质页岩为主。页岩储层储集空间分为基质微孔和有机质微孔,其中基质微孔主要由粒间微孔、晶间溶孔和黏土矿物晶间孔构成,有机质微孔主要为有机质演化过程中形成的油孔和气孔;物性表现为低孔、特低渗的特征。综合该套页岩储层的地化品质、岩矿组成、储集条件等,认为其具有一定的页岩油气勘探开发潜力。
Based on the geological analysis of single-well reservoirs,combined with the experimental analysis of the test samples,outcrop data and results of previous studies,this paper studies the shale reservoir characteristics of Member 7 of Triassic Yanchang Formation in Ordos Basin from the aspects of geochemical characteristics of shale,rock and mineral characteristics,reservoir conditions and physical properties,etc..Member Chang 7 reservoir is mainly deep lake-semi-deep lake sedimentary facies.The shale rich in organic materials is located in the south of the basin.The thickness of the shale in Xiasiwan-Fuxian and Yanchi-Jiyuan areas is maximum.The burial depth of the shale gradually increases from the south Weibei uplift to northwest and the depth is ＜2.5 km.The type of organic matter is mainly Type Ⅰ and secondly is Type-Ⅱ.The mass fraction of TOC is 0.51％～22.6％ and Ro is 0.7％～1.2％.Lithology is mainly black laminated shale and silty shale.The reservoir space of the shale is divided into matrix micropores and organic matter micropores.The matrix micropore is mainly composed of intergranular pore,intercrystalline dissolved pore,and intercrystalline pore of clay minerals,while the organic matter micropore is mainly oil pore and gas pore coming from organic material evolution.The physical property of the shale is characterized by low porosity and low permeability.Through the comprehensive study of the geochemical quality,rock mineral composition,reservoir conditions of this suite of shale reservoirs,the authors think that the shale reservoirs have a certain exploration and development potential of shale oil and gas.
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第6期671-676,共6页
Journal of Chengdu University of Technology: Science & Technology Edition
关键词
鄂尔多斯盆地
延长组
长7油层组
页岩储层
Ordos Basin
Yanchang Formation
Chang 7 oil reservoirs
shale reservoir
