鄂尔多斯盆地西南部长6段粘土矿物特征  

Characteristics of Clay Minerals in Chang-6 Member in Southwestern Ordos Basin

作　　者：周晓峰[1,2] 何顺利[3,2] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249 [2]中国石油大学石油天然气工程学院,北京102249 [3]中国石油大学气体能源开发技术教育部工程研究中心,北京102249

出　　处：《新疆石油地质》2010年第6期587-589,共3页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2008zx05009)

摘　　要：根据物性、粘土矿物X衍射和扫描电镜等测试分析,鄂尔多斯盆地西南部延长组长6段超低渗透砂岩粘土矿物类型为绿泥石、伊蒙混层和伊利石,粘土矿物相对含量分带性明显,研究区的东部绿泥石含量较高,而西部伊蒙混层含量较高。粘土矿物特征与储集层物性的相关性分析认为,伊蒙混层含量、伊利石含量均与储集层孔渗性能呈负相关;绿泥石含量与储集层孔渗性呈正相关;研究区东部储集层的质量优于西部。Based on the petrophysical property,clay mineral X-ray diffraction and SEM observation,the characteristic of clay mineral in super-low permeability sandstone of Chang-6 member of Yanchang formation in southwestern Ordos basin is studied.The result shows that the clay minerals consist of chlorite,illite/smectite mixed layer and illite;and the occurrence of chlorite is pore space lining or pore space filling,and the occurrence of illite/smectite mixed layer and illite is bridging or pore space filling;the relative content of clay minerals is characterized by obvious zonality,namely,high chlorite content appears in the eastern part of the studied area,and high illite/smectite mixed layer content occurs in the western part.According to the correlation analysis of clay minerals and the reservoir petrophysical property,the contents of illite/smectite mixed layer and illite show an inverse correlation to the porosity and permeability of the reservoir,while the content of chlorite manifests a positive correlation to the porosity and permeability,indicating that the quality of the reservoir in the eastern part is better than that in the western part of the studied area.

关 键 词：鄂尔多斯盆地 低渗透储集层 粘土矿物 储集层物理性质 延长组 

分 类 号：TE112.221[石油与天然气工程—油气勘探]