鲁克沁东区梧桐沟组储层四性关系及有效厚度下限研究

鲁克沁东区梧桐沟组油藏主要以扇三角洲前缘水下分流河道细砂岩、砂砾岩为储层,属于中孔中渗、高孔高渗细喉型储层;含油性主要受岩性和物性的双重控制,细砂岩含油性最好,砂砾岩次之;储层物性越好,含油就越饱满。通过对梧桐沟组储层岩性、物性、电性、含油性特征及其相关关系的研究,制定了该组油层有效厚度判别标准:孔隙度下限为18%,渗透率下限为3×10^(-3)μm(-3)μm²,电阻率下限为3Ω·m,声波时差下限为270μs/m,密度的上限为2.38g/cm3。

The study of four property relationship and lower limit of effective thickness in reservoir of Wutonggou formation in eastern area of Lukeqin oilfield

The mainly reservoir of Wutonggou formation in eastern area of Lukeqin oilfield consists fine sandstone and glutenite of fan delta front underwater distributary channel,which has a high quality with medium to high porosity and permeability.Oiliness of reservoir is controlled mainly by both lithology and physical property.The oiliness of fine sandstone is the best,while glutenite takes second place.Meanwhile,the better the physical property is,the better the oiliness of reservoir.By the study of lithology,physical property,electric property,oil- bearing characteristics and the correlations between each other,a distinguishing criterion of effective oil reservoir thickness has been established.The lower limit of porosity is 18%,lower limit of permeability is 3×10-3μm2,lower limit of resistivity is 3Ω?m,lower limit of AC is 270μs/m,and upper limit of density is 2.38g/cm3.