由于低孔隙度、 低渗透率和低电阻率储层在鄂尔多斯盆地油藏中所占的比例较大， 这类储层在测井曲线上的响应特征较为复杂， 导致油水层识别比较困难， 降低了研究区 储层测井处理和解释的精度和准确度， 严重制约了这类储层的勘探开发。 因此很有必要 对储层“四性” 关系展开研究， 从而能够较准确地识别出储层油水层， 进而为勘探开发 提供可靠的资料和依据。 NQ 油区位于鄂尔多斯盆地陕北斜坡东南部， 三叠系延长组的长 6 油层是该区的主 要含油层段。 本文通过整理分析岩心、 铸体薄片、 电镜扫描、 试油试采及测井等资料， 依据岩性、 电性以及标志层特征， 先将长 6 油层组划分为长 61、 长 62、 长 63、 长 64 四 个亚组， 之后再从岩石地质学等多种地质学科方面对长 6 储层的岩石学特征、 成岩作用 及物性特征等基本地质特征进行了研究。 研究区主要发育残余粒间孔、 溶蚀粒间孔、 粒 内溶孔。 长 6 储层的孔隙度平均值为 10.24%， 渗透率平均值为 1.38×10-3μm2， 主要为低 孔、 特低渗储层。 在以上研究的基础上， 详细研究了储层的岩性、 物性、 含油性和电性， 建立了适合本区的孔隙度、 有效厚度等参数的标准。 具体的标准列举如下： 渗透率不小于 0.3×10-3μm2， 含水饱和度不得高于 60%， 油 层含油的最低标准是有部分油斑， 孔隙度不小于 8%， 电阻率不小于 22Ω·m； 声波时不 小于 220μs/m。 依据低渗透油田分类评价标准， 对研究区储层进行了分类评价， 得到长 6 储层主要为 IIIa类、 IIIb 类， 为特低渗储层、 部分为超低渗储层。 这些研究成果将为油 区后期勘探开发提供可靠的理论依据。

Reservoirs of low porosity, low permeability and low resistivity take up a large proportion in Ordos Basin.Well logging curves which respond the reservoir characteristics complicated, which increase the difficult to identify the oil-water layer, reduce the precision and accuracy of the reservoir logging processing and interpretation, and then restrict the reservoir exploration and development seriously.Thus, it is necessary to study the Four-property relationship of reservoir, so that oil-water layer could be identified more accuracy, and then provide reliable information and basis for exploration and development. NQ oil region is located in the southeast of the Shanbei slope in Ordos Basin. The main oil-bearing strata is the Chang 6 reservoir in the triassic. In this thesis, collecting data through core analysis, cast thin section, scanning electron microscope, producing test, log information and so on, according to lithology, electrical characteristics and the characteristics of the signs, and then the Chang 6 reservoir is divided into 61, 62, 63 and 64 four subgroups, then this thesis further studies basic geological features such as petrology characteristics, diagenesis and physical characteristics from the rock geology and other geological disciplines. Reservoirs mostly develop residual intergranular pore, dissolution intergranular pore and intragranular dissolved pore. Average porosity of Chang 6 reservoir is 10.24%, average permeability is 1.38×10-3μm2, this shows that Chang 6 reservoir belongs to low porosity and extra-low permeability reservoir. Based on these researches, the thesis does a detailed study to lithology, physical property, oil-bearing property and electrical property of the reservoir. The parameters ofporosity, effective thickness and others are established. Specific criteria are listed as follows: permeability is greater than or equal to 0.3×10-3μm2, water saturation is less than or equal to 60%, the lower limit of the oil-bearing property is oil spot or above it, porosity is greater than or equal to 8%, the resistivity is greater than or equal to 22Ω·m, and the acoustic time value is greater than or equal to 220μs/m. According to the classification and evaluation criteria of the low permeability oilfield, the reservoirs of the study area are classified and evaluated. IIIa and IIIb reservoirs are the main type of Chang 6 reservoir, so that Chang 6 reservoir mainly belongs to extra-low permeability reservoir, super-low reservoir in local regions. The research results will provide reliable theoretical basis for the late exploration and development.