陕北吴起地区延长组储层非均质性特征

发布时间：2018-10-29 19:24

【摘要】：储层非均质性是造成储层砂体内部渗透率垂向及平面变化的主要因素。通过对砂岩储层中碎屑颗粒、填隙物含量等演示学特征及成岩作用的分析,利用非均质性计算指标分析吴起地区延长组储层非均质性特征。研究表明吴起地区延长组以发育长石砂岩为主,具有分成熟度高、分选好的特征,成岩作用主要表现为压实和压溶、胶结作用、交代作用和溶蚀作用,从层内非均质性、层间非均质性和平面非均质性等非均质性指标分析认为,单砂体粒度特征以正韵律、正韵律叠加和复合韵律较为发育,层理构造的垂向变化引起渗透率的垂向变化,泥质夹层、钙质夹层对油藏进行了分割,储层砂体渗透率值非均质性强的特征明显。储层非均质性差异导致吴起地区延长组砂体在平面上使得渗透率值呈北东-南西向展布,是由于不同沉积环境水动力条件变化的结果。
[Abstract]:Reservoir heterogeneity is the main factor that causes vertical and plane change of reservoir sand permeability. Based on the analysis of the demonstration characteristics and diagenesis of detrital grains and interstitial contents in sandstone reservoir, the heterogeneity characteristics of Yanchang formation reservoir in Wuqi area are analyzed by using the calculation index of heterogeneity. The study shows that the Yanchang formation in Wuqi area is mainly composed of feldspathic sandstone, which is characterized by high maturity and good sorting. The diagenesis is mainly characterized by compaction and pressure solution, cementation, metasomatism and dissolution, and heterogeneity from the inner layer. According to the analysis of heterogeneity indexes such as interlayer heterogeneity and plane heterogeneity, the grain size characteristics of single sand body are normal rhythm, positive rhythm superposition and compound rhythm, vertical variation of bedding structure leads to vertical change of permeability and muddy intercalation. The reservoir is divided by calcareous intercalation, and the permeability of sand body is strong heterogeneity. The difference of reservoir heterogeneity leads to the distribution of permeability values in the plane of Yanchang formation in Wuqi area, which is due to the variation of hydrodynamic conditions in different sedimentary environments.
【作者单位】：延长油田股份有限公司吴起采油厂;
【分类号】：P618.13

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