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为探讨成岩相的定量划分方法,以鄂尔多斯盆地神木气田山2段砂岩为研究对象,综合利用测井资料和实验测试结果,依据成岩和测井参数,建立了成岩相定量划分标准,阐述了不同成岩相的特征差异。研究区山2段砂岩岩性为岩屑石英砂岩、岩屑砂岩和石英砂岩,发育岩屑溶孔、晶间孔、粒间溶孔、杂基溶孔和粒间孔。经历了压实压溶作用、胶结作用和溶解作用,压实率中等—强,胶结率中等,溶解率中等—强。根据成岩作用定量参数划分出5种成岩相类型,基于自然伽马、深侧向电阻率、声波时差和密度测井建立的识别标准可进行有效区分。发育于分流河道砂体中间的中等压实伊利石胶结—粒间孔+溶蚀孔相,孔隙发育程度最高、物性最好,孔喉分布范围最宽,大孔喉含量高,是研究区最有利的成岩相带,中等压实伊利石、高岭石胶结—溶蚀孔+晶间孔相次之。
In order to explore the method of quantitative division of diagenetic facies, the sandstone of the second member of Shenmu gas field in Ordos Basin was taken as the research object. According to the logging data and the experimental test results, the quantitative criteria of diagenetic phase were established based on the diagenesis and logging parameters. Characteristics of diagenetic facies. Sandstone lithology in Shan 2 section of the study area is lithic quartz sandstone, lithic sandstone and quartz sandstone, and lithic argillaceous pores, intergranular pores, intergranular dissolved pores, heterogeneous dissolved pores and intergranular pores are developed. Experience compaction pressure solution, cementation and dissolution, the compaction rate of medium - strong, medium rate of consolidation, the dissolution rate of moderate - strong. Based on the quantitative parameters of diagenesis, five types of diagenetic facies are classified, and the identification criteria based on natural gamma ray, deep lateral resistivity, acoustic time difference and density logging can be effectively distinguished. The moderately compacted illite cements - intergranular pores + dissolved pores developed in the middle of distributary channel sand bodies have the highest porosity and physical properties, the widest pore-throat distribution and the high content of macroporous throats, which is the most favorable for the study area Diagenetic facies, medium compaction illite, kaolinite cementation - dissolution hole + intergranular pore followed.