摘要
为了探究鄂尔多斯盆地南部长7陆相储层页岩基质孔隙发育影响因素,应用氩离子抛光-扫描电镜、X射线衍射能谱仪、有机碳测定、有机质成熟度测定、高压压汞和Image J图像处理等分析测试处理技术对其进行了系统研究。研究表明:长7陆相页岩中的基质孔隙类型主要包括长石和碳酸盐矿物粒内溶孔、粒间溶孔和黏土矿物层间孔,其中页岩孔隙中65%为溶蚀孔,20%为黏土矿物层间孔,其余为有机孔、微裂缝和残余粒间孔;页岩中黏土矿物含量最高;页岩中溶蚀孔的比例随有机质成熟度升高而增大。有机质热演化过程中产生的有机酸促进了基质孔隙发育,脆性矿物和胶结物充填了基质孔隙不利于孔隙发育,黏土矿物含量越高基质孔隙发育程度越低。
The pore development of the continental shale matrix of Chang 7 reservoir in southern Ordos Basin was studied by means of Argon-ion polishing-scanning electron microscopy,X-ray diffraction spectrometer,organic carbon determination,organic matter maturity determination,high pressure mercury injection and Image J image processing. The result shows that the matrix pore types of the continental shale mainly include the intragranular dissolved pores and inter-granular dissolved pores of feldspar and carbonate mineral,and the interlayer pores of clay minerals. The dissolution pore is 65%,the clay mineral interlayer pore is 20%,and the remaining is organic pore,micro fracture and residual intergranular pore. The content of clay minerals in the shale is the highest,and the higher the maturity of organic matter is,the higher the proportion of dissolved pores in matrix pores is. The organic acids produced during the thermal evolution of organic matter promoted the development of matrix pores,brittle minerals and cements filled the matrix pores,which is not conducive to the development of pores. The higher the content of clay minerals is,the lower the pore development of matrix is.
作者
黄海
陈军斌
邓彦玲
王晓明
HUANG Hai CHEN Junbin DENG Yanling WANG Xiaoming(College of Petroleum Engineering, Xi＇an Shiyou University, Xi＇an 710065, Shaanxi, China Oil and Gas Fields Special Production Increasing Technology Laboratory of Shaanxi Province, Xi＇an Shiyon University, Xi＇an 710065, Shaanxi, China)
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2017年第5期42-48,共7页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家自然科学基金面上项目"页岩气藏水平井液态气动力压裂增产新方法研究"(51374170)
陕西省工业科技攻关项目"页岩气压裂储层多尺度孔隙气体赋存及流动规律研究"(2015GY109)
陕西省教育厅重点实验室科研计划基金资助项目(15JS086)
