鄂尔多斯盆地子洲气田北部山32段储层成岩作用及成岩相定量化分析

通过铸体薄片、扫描电镜、高压压汞和X-射线衍射等实验分析，在分析鄂尔多斯盆地子洲气田北部上古生界山³₂气层段储层岩石学、物性及孔隙结构特征的基础上，①定性分析了储层所发生的成岩作用，利用视压实率、视胶结率和视溶蚀率等多参数定量化表征各成岩作用的强度；②还原储层成岩演化序列，确定成岩阶段和孔隙演化模式；③根据成岩作用定性和定量化分析结果，结合物性分析和毛细管压力曲线特征，划分成岩相类型；④总结成岩相平面展布特征。研究表明:研究区山³₂段储层经历了压实、胶结、交代和溶蚀等4种成岩作用；储层目前已演化至中成岩B期，部分可达晚成岩阶段；储层共发育6种成岩相，其中最有利的成岩相带为弱压实硅质弱胶结粒间孔溶蚀相；在平面上呈土豆状、岛状发育于研究区西南部水下分流河道砂体中部，是研究区山³₂气层段开发部署的首选区域。

Quantitative Analysis of Diagenesis and Diagenetic Facies of Reservoir of Shan32 Member in the North of Zizhou Gasfield,Ordos Basin

Analytical tests were used in this study such as core observation,casting thin section observation,SEM,high pressure Hg injection and X-ray diffractometer.Based on study of lithology characteristics,physical properties and pore structure on Shan³₂ member of Shanxi Formation in the north of Zizhou Gasfield in the Ordos Basin,the diagenesis was analyzed qualitatively and quantitatively by multi-parameter.Diagenetic evolution sequence,determined diagenetic stage and porosity evolution were restored.The diagenetic facies of reservoir were divided according to the results of diagenesis analysis,physical property and characteristics of capillary pressure curve.The plane distribution characteristics of diagenetic facies were studied.This research shows that Shan³₂ reservoir of the study area has experienced four stages of diagenesis which respectively are compaction,cementation,metasomatism and dissolution.It is now in the phase B of middle diagenetic stage,with parts of the late diagenetic stage.The diagenetic facies of reservoir are divided into six types.The most favorable facies distribute in central of underwater distributary channel in the southwest of the study area,which are potato-like or island shaped.These areas are the preferred for gas exploration and development of Shan³₂ Member in the north of Zizhou Gasfield.