老爷庙油田庙北东营组储层微观特征研究

Study on microscopic characteristics of Dongying Formation in north Laoyemiao Oilfield

利用测井、岩石薄片、扫描电镜、压汞测试等资料,对老爷庙油田庙北东营组三套含油层系的岩石学特征、微观孔喉特征等开展研究。东营组储层岩石组分以石英、长石为主,岩屑以酸性喷出岩岩屑为主,填隙物成分以黏土、碳酸盐胶结物为主,颗粒搬运距离较远,压实作用较弱;储集空间以粒间孔为主,其次为粒内孔、铸模孔;以喉道大小为主线制定了该组储层孔隙结构的分类标准,认为孔喉细小、连通程度低、分选差是目的层孔隙的主要特点,推测该油藏的特征为高束缚水、低含油饱和度。综合岩石学、微观特征及储层物性、非均质性、敏感性等分析,认为Ed_1是该工区最有利含油层系。

The petrological characteristics and microscopic pore throat characteristics of the three oil-bearing series of Dongying Formation in north Laoyemiao Oilfield were studied by means of logging,rock slices,scanning electron microscope and capillary pressure test.The rock component of Dongying Formation is mainly quartz and feldspar,the cuttings are dominated by acid extrusive rock,the composition of the interstitial material is mainly clay and carbonate cement,particle handling distance is far,the compaction is weaker; The reservoir space is dominated by intergranular pore,followed by intragranular pore and mold pore; The classification standard of the pore structure of the reservoir was established by using the throat size as the main line,it is considered that the pore throat is small,the degree of connectivity is low,and the sorting is poor are the main characteristics of the pore of the target layer,suggesting that it has the characteristics of high binding water and low oil saturation.Based on the analysis of petrology,microcosmic characteristics,reservoir property,heterogeneity and sensitivity,Ed1 is the most favorable oil layer in the working area.