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通过岩心观察、粒度分析、铸体薄片、扫描电镜、X—衍射、高压压汞等实验方法对鄂尔多斯盆地西缘姬塬地区与盆地东缘安塞地区延长组长6储层成岩作用进行研究对比。研究表明盆地东西缘长6储层来自于不同的物源区,主要发育了机械压实作用、溶蚀作用、胶结作用。其中压实作用是造成延长组长6储层砂岩孔隙度丧失的主要原因。胶结作用同样降低了储层物性,其中碳酸岩胶结物是研究区胶结作用中的主要胶结物。姬塬研究区以方解石为主,其次为硅质胶结;安塞研究区早期胶结的方解石大部分被溶蚀,含量不多,以晚期胶结未被大量溶蚀的铁方解石为主,硅质胶结物含量较少。
The diagenesis of Chang 6 reservoir in Yanchang Formation in the Jiyuan area on the western edge of Ordos Basin and the Ansai area in the east margin of the basin was studied by means of core observation, grain size analysis, casting thin slice, SEM, XRD and high pressure mercury intrusion. . The results show that the Chang 6 reservoirs on the east and western margin of the basin originate from different provenance areas and mainly develop mechanical compaction, dissolution and cementation. The compaction is the main reason for the loss of porosity in the sandstone of Group 6 reservoir. Cementation also reduces reservoir physical properties, with carbonate cements being the major cement in the cementation of the study area. The study area of Jiyuan is dominated by calcite, followed by siliceous cementation. Most of the early cemented calcite in Ansai study area was mostly eroded with little content. The calcite, which was not corroded by advanced cementation, was mainly dominated by siliceous cements. less.