密度测井在鄂尔多斯盆地油气田应用

鄂尔多斯盆地广泛分布低渗透率、特低渗透率油气藏。这类油气藏孔隙度小、渗透率低,含油气性不均,微裂缝发育,岩性、物性对储层电性的影响大于含油气性的影响,油气层和水层测井响应差异小,储层识别难度大,用声波-电阻率判识流体性质显示出方法单调,难以准确地判断储层流体的性质,加入放射性密度测井,在判断储层岩性、物性、渗透性、识别油气上得到改观。

Application of Density Logging in Oil and Gas Fields in Ordos Basin

Low-permeability,super-low-permeability hydrocarbon reservoirs distribute widely in Ordos basin.This kind of reservoir has chericteris- tics of low porosity,low permeability,asymmetric hydrocarbon-bearing,and high developed microfractures.Its lithology and physical prop- erties have more impact on the electrical properties than hydrocarbon-beating.There are less differences in logging response between oil layer and water layer.So it is difficult to identify the reservoir.It is showed that identifying fluid property with acoustic-resistivity logging is humdrum and it is hard to judge the fluid property in the reservoir accurately.Radioactive density logging has made much improvement in judging reservoir lithology,physical properties,permeability and hydrocarbon identification.