鄂尔多斯盆地天环坳陷北段长8储层致密成因

发布时间：2018-05-05 10:41

本文选题：天环坳陷北段 + 长储层　；参考：《东北石油大学学报》2016年05期

【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。
[Abstract]:The northern section of Tianhuan depression in the Ordos Basin and Jiyuan area belong to the northwest depositional system, and are closer to the provenance than the Jiyuan area, but the difference between the physical property of the Chang 8 reservoir in this area is less than that of the Jiyuan area. The difference between the grain size and the formation water analysis and the imaging logging is used to analyze the difference between the diagenetic environment of the 8 reservoir in the north of the Tianhuan depression and the Jiyuan area. The results show that, since the late Jurassic, the north section of the sky ring is in the lowest part of the sky ring depression, and the compaction is strong. The study area is near the tectonic movement zone, the fracture is developed, the fluid sealing is poor in the target layer. Under the effect of tectonic stress, the fluid exchange of sandstone and mudstone is strong, and the ions consumed by the diagenetic reaction are constantly supplemented, resulting in the iron solution. The cementation of stone and kaolinite is serious, and strong compaction and cementation are the main causes of the density of the reservoir. The results of this study have reference significance for the exploration and development of the Ordos Basin.

【作者单位】：低渗透油气田勘探开发国家工程实验室;中国石油长庆油田分公司勘探开发研究院;中国石油长庆油田分公司第一采油厂;
【基金】：国家科技重大专项(2011ZX05044,2011ZX05001-004)
【分类号】：P618.13

【参考文献】