绥靖油田A14区延9_1油层组储层特征研究

Research on the characteristics of Yan 9_1 oil layer group in A14 district of Suijing oilfield

本文以鄂尔多斯盆地绥靖油田A14区侏罗系延安组延9_1油层组为研究对象,运用沉积学、石油地质学等理论,结合岩心、测井以及分析化验资料,从储层岩石学特征、储层孔隙类型和储层平面非均质性3个方面系统研究了该区的储层特征。结果表明,研究区内延9_1储层主要发育中-细、细粒石英砂岩、长石砂岩,颜色多以褐灰色、浅灰色为主,填隙物含量较少,大部分为高岭石。孔隙类型主要为粒间孔、粒内溶孔。孔隙度主要分布在15%~20%,渗透率多集中在10×10^(-3)μm^2~100×10^(-3)μm^2范围内,属于中孔-低渗储层。储层平面非均质性整体上表现出了延9_1~1到延9_1~3变强的趋势。

The paper takes Yan 91 oil reservoir of Jurassic Yan＇an formation in A14 district of Suijing oilfield in Ordos basin as an object of study. On the basis of sedimentology and petroleum geology and so on, simultaneously combined with the data of core, well logging and analysis of test, we can systematic study the reservoir characteristics from three aspects that include of reservoir petrology characteristics, reservoir pore type and reservoir plane heterogeneity. The research results indicate that the main rock types in Yan 91 reservoir are medium-fine,fine quartz sandstone and arkose, color mainly is light-gray and brown-gray,and the content of interstitial material is low, which the majority is kaolinite. Pore types are mainly intergranular pore and intragranular dissolved pore. The porosity of Yan 91 reservoir is mainly between 15 %-20 % and the permeability is mainly ranged from 10 ×10^-3μm^2-100 ×10^-3μm^2, it belongs to middle porosity and low permeability reservoir. The research of reservoir plane heterogeneity indicates that the plane heterogeneity tends to be strong from Yan 91^1 to Yan 91^3 reservoir.