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为研究南堡凹陷滩海地区深层储层特征和输油性能,采用铸体薄片、岩心分析化验等资料,从控制渗流能力和油气运聚成藏角度出发,选取孔隙度、渗透率、孔隙半径、排替压力4个参数,建立储层输油性能评价预测体系,运用公式法,进行定量评价,研究储层含油气性下限值.结果表明:研究区储层储集空间以残余原生粒间孔隙、粒间溶蚀孔隙和粒内溶蚀孔隙为主;次生孔隙主要为碳酸盐岩胶结物和长石颗粒溶蚀形成,其次为岩屑溶蚀.溶解成岩作用有利于深部储层次生孔隙发育,减弱储层总孔隙度损失量,有利于砂体输油性能的改善.储层含油气性下限预测值分别为孔隙度8.24%,渗透率0.10×10~(-3)μm~2,孔喉半径0.28μm,排替压力0.84 MPa.这有助于南堡凹陷深层储层特征研究和勘探目标优选.
In order to study the characteristics of deep reservoirs and oil transportation in the Tanhai area of Nanpu Sag, porosity and permeability, porosity and permeability were selected from the perspectives of control of seepage ability and hydrocarbon accumulation and accumulation by using the thin sections of castings and cores. , Displacement pressure of four parameters, the establishment of reservoir oil performance evaluation prediction system, the use of formula method for quantitative evaluation of the lower limit of hydrocarbon-bearing reservoirs.The results show that: the reservoir area of the reservoir to the residual primary particles Intergranular dissolution, intergranular dissolution and intergranular dissolution. The secondary porosity is mainly composed of carbonate cements and feldspar grains, followed by lithic dissolution. Dissolution diagenesis is favorable for secondary reservoir porosity Development and weakening the total porosity loss of the reservoir are favorable to the improvement of oil transport performance of the sand body.The predicted values of the lower limit of hydrocarbon-bearing reservoirs are respectively 8.24% porosity and 0.10 × 10 -3 -3 μm 2 permeability, The pore throat radius is 0.28 μm and displacement pressure is 0.84 MPa, which is helpful for the study of deep reservoir characteristics and exploration target selection in Nanpu Sag.