吴起油田楼坊坪油区储层特征研究及评价

Study and evaluation of reservoir characteristics of Loufangping Oil Area,Wuqi Oilfield

为进一步了解吴起油田楼坊坪油区的储层特征,挖掘开发潜力,针对研究区长8和长9储层特征研究中存在的薄弱问题,利用岩心薄片、压汞、测井及岩心等分析资料,从岩石学特征、物性、孔隙结构以及非均质性等方面对研究区进行储层表征研究,并对储层进行了分类评价。结果表明:1)研究区油层主要成分为长石砂岩,其余依次为岩屑、云母和填隙物;2)研究区储层孔隙度主要为6%~12%,渗透率主要为(0.3~1.0)×10^(-3)μm^(2),整体上属于低-特低孔隙度及超低渗透率储层,物性较差;3)该区油组砂岩储层的非均质程度层内为不均质地层,层间为“极不均质”;4)储层类型以Ⅳ_(a)和Ⅳ_(b)为主,是超低渗储层。以上成果认识,对研究区持续开发提供一定理论依据。

In order to further understand the reservoir characteristics and explore the development potential of Loufan-gping Oil Area,Wuqi Oilfield,in response to the weakness problems in the study of reservoir characteristics of Chang8 and Chang9 in the study area,using analytical data such as core flakes,mercury pressure,logging,and cores to do the reservoir characterization within the study area in terms of petrological features,physical properties,pore structure,non-homogeneity,and other aspects and conduct the reservoir classifications and evaluations.The results show that:1)Feldspathic sandstone is the main component of the oil formation in the study area,followed by rock debris,mica,and filler;2)The porosity of the reservoir in the study area ranges mainly from 6%to 12%,and the permeability is mainly ranging from(0.3 to 1.0)×10^(-3)μm^(2),which belongs to the low-to-ultra-low porosity and ultra-low permeability reservoirs with poor physical properties on the whole;3)The inhomogeneity degrees of the sandstone reservoir of this oil formation are inhomogeneous within the layer,and the interlayer are"extremely inho-mogeneous";4)The reservoirs in the study area are mainly Ⅳ_(a) and Ⅳ_(b),which are ultra-low-permeability reservoirs.The above results provide a certain theoretical basis for the continued development of the study area.