过渡相页岩储层纳米矿物孔隙的成因-形貌类型及系统分类——以太原西山古交矿区山西组页岩为例  

Genesis,morphological types and systematic classification of nano-mineral pores in transitional facies shale reservoirs:A case study of Shanxi Formation shale in Xishan Gujiao mining area,Taiyuan

作　　者：刘旭彤 赵迪斐[2] LIU Xutong;ZHAO Difei(Sun Yueqi Honors College,China University of Mining and Technology,Jiangsu Xuzhou 221116,China;Artificial Intelligence Research Institute of China University of Mining and Technology,Jiangsu Xuzhou 221008,China)

机构地区：[1]中国矿业大学孙越崎学院,江苏徐州221116 [2]中国矿业大学人工智能研究院,江苏徐州221116

出　　处：《非常规油气》2023年第1期77-83,103,共8页Unconventional Oil & Gas

基　　金：江苏省自然科学基金项目“超高精度3D-4D孔隙精细结构及微观流体行为机理表征”(SBK2021045820);中国矿业大学青年科学基金项目“基于超高精度表征技术与持续同调拓扑的纳米储层孔隙流体行为机理研究”(2021QN1061)。

摘　　要：以太原西山古交矿区山西组过渡相页岩代表性储层样品为例,利用氩离子抛光-场发射扫描电镜、X射线衍射、能谱测试以及图像数字化处理等技术手段,对过渡相页岩纳米尺度矿物孔隙的形貌特征、成因和类型进行系统观测,建立纳米尺度矿物孔隙的系统分类方案。结果表明:过渡相页岩储层纳米尺度矿物孔隙发育类型丰富,成因复杂,根据孔隙发育的矿物、空间位置和成因等,可以将储集空间进一步划分为脆性矿物孔隙、黏土矿物孔隙及其他矿物孔隙、微裂隙,主要呈现圆孔状、狭缝状、平直状以及曲折状等形貌特征。通过对成因-空间位置-形貌特征的系统对比,建立了过渡相页岩储层矿物纳米孔隙系统分类方案。应用图像数字化处理技术,获得各类孔隙类型的相对比例。对比表明,过渡相页岩不同类型矿物孔隙与海相页岩差异显著,对页岩储层的物性及非均质性影响显著。On the basis of observing and identifying the genesis and morphological characteristics of nano mineral pores in transitional phase shale reservoirs,taking the representative reservoir samples of transitional phase shale in Shanxi Formation of Xishan Gujiao mining area in Taiyuan as an example,the morphological characteristics,genesis and types of nano scale mineral pores in transitional phase shale were systematically observed by means of argon ion polishing field emission scanning electron microscope,X-ray diffraction,energy spectrum test,digital image processing and other technical means,the systematic classification scheme of nano scale mineral pores is established.The results show that the nano scale mineral pores in the reservoir are rich in types and complex in genesis.According to the supporting minerals,spatial location and genesis of pore development,the mineral pores can be further divided into clay mineral intergranular pores,clastic mineral intragranular pores,clastic mineral intergranular pores,microcracks,mineral peripheral pores and other types.The pore structures of different types are significantly different,mainly nano slit pores,which are mainly contributed by intercrystalline pores,microcracks and peripheral pores of clay minerals.Through the systematic comparison of genesis,spatial location and morphology characteristics,a nano mineral pore system classification scheme for transitional phase shale reservoir is established,and the relative proportion of representative samples is obtained by using image digital processing.The results show that the mineral pores of different types of transitional phase shale are significantly different from those of marine shale,and have a significant impact on the physical properties and heterogeneity of shale reservoir.

关 键 词：页岩储层 矿物孔隙 过渡相 孔隙类型 孔隙分类 

分 类 号：P624[天文地球—地质矿产勘探]