摘要
鄂尔多斯盆地天环坳陷北段与姬塬地区同属西北沉积体系,且比姬塬地区更靠近物源区,但是该区长8储层物性较姬塬地区的差。利用薄片观察、粒度和地层水分析、成像测井等资料,分析天环坳陷北段与姬塬地区长8储层成岩环境的差异性。结果表明:自晚侏罗系以来,天环北段处于天环坳陷最低部位,压实作用强烈;研究区临近构造活动带,裂缝发育,目的层流体封闭性差,在构造应力的作用下,砂岩和泥岩流体交换作用强,成岩反应消耗的离子不断得到补充,导致铁方解石、高岭石胶结严重;强烈的压实和胶结作用是导致储层致密的主要原因。该研究结果对鄂尔多斯盆地石油勘探开发具有参考意义。
The north of Tianhuan depression and Jiyuan area in Ordos basin both belong to Northwest sedimentary system,and the first is nearer source area,however,the physical properties of Chang 8reservoir is denser compared with Jiyuan area.Using data from the cast slice,grain size,formation water and imaging logging to analyze the difference of diagenetic environment.The study shows that the north of Tianhuan depression is in the lowest place in Tianhuan depression to cause the strong compaction because of the deep buried since late Jurassic.The area is closed to tectonic activity belt with developed fracture,and the fluid of target layer is poorly closed,and fluid changes frequently between sandstone and mudstone under the tectonic stress,and diagenetic ions are constantly replenished,leading to the layer with strong ferrocalcite and kaolinite cementation.Strong compaction and diagenetic cementation are the main causes of tight reservoir.The results of this study have reference value for the further exploration and development of oil in the Ordos basin.
出处
《东北石油大学学报》
CAS
北大核心
2016年第5期38-45,共8页
Journal of Northeast Petroleum University
基金
国家科技重大专项(2011ZX05044
2011ZX05001-004)
作者简介
刘广林（1982-）,男,硕士,工程师,主要从事油气勘探及综合地质方面的研究.
