石油资源在我国能源战略中占据着举足轻重的位置，随着经济的快速发展，对油气资源的需求越来越多，但石油勘探开发的难度却越来越大。这就需要对油藏进行精细描述研究以便更好地了解剩余油的分布规律和展布特征，油藏精细描述的终极成果就是建立储层地质模型。WEH油田位 于准噶 尔盆地西北边缘的乌-夏断 裂带中的WEH断背斜的中南部位置，WU66井区克下组油藏的孔渗特点是渗透率低、孔隙度为中低，目前该区的含 水率上升较快，产量递减也较快，稳产的难度比较大。 此次研究在系统分析区域地质概况和构造特征的基础上，以地震、地质、测井和油藏精细描述等学科为理论指导，利用油气以及岩层在测井曲线上的响应特征，开展油、岩层的解释以及地层的对比研究。根据新完钻井的资料，进行精细地震层位标定，在地震中对研究区构造进行解释，根据油层组的沉积旋回规律、地层厚度情况、单油层的发育特征、韵律层特征及含油性等特征划分地层。依据岩心描述、分析及测井等资料，分析区域沉积体系，然后利用沉积相标志和测井相特征划分各沉积时间单元的沉积微相类型。通过观察岩心和室内薄片的鉴定，研究储集层的岩石学特征，并对岩石成分特征进行分析。通过研究储层孔渗的分布特征以及储集层“四性”之间的相互关系，建立储层泥 质含量、孔 隙度、渗 透率以及含油饱 和度的测井解释模型。运用Petrel软件采取随机建 模的方法建立了三维构造模型、储层沉积相模型以及储集层的属性参数模型。 通过研究可以得知，WU66井区克下组顶部构造形态为两条逆断层遮挡的大型鼻状构造，S7油层组分为3个砂层共13个小层，其中S71-4、S72-4、S73-2、S73-3为主力油层。WU66井区克下组为受波浪改造作用较强的小型三角洲沉积，主要发育三角洲前缘沉积亚相，发育的微相主要有三角洲前缘水下分流河道和分流间湾。通过三维地质模型可知WU66井区克下组的孔隙度、渗透率以及含油饱和度均具有较强的非均质性。

The oil and gas resources play an important role in China's energy strategy. With the rapid development of the economy, the demand for oil and gas resources are increasing, but the exploration and development of oil and gas become more and more difficult. In order to have a better understanding of the remaining oil distribution and the oil distribution characteristics, the fine reservoir description research is needed. The end result of the fine reservoir description is to establish the geological model. WEH oilfield locates in the south-central of the WEH faulted anticline, which belongs to Wuxia fault belt of Zhungaer basin northwestern margin. Kexia reservoir of WU66 Well block is the low permeability and medium-low porosity reservoir. Currently the water content rises fast, the production declines quickly and keeping the stable production is more difficult. Based on the analysis of the regional geology and tectonic characteristics in system, seismic, geology, logging, fine reservoir description technology and so on are regarded as the theory subject. The responses characteristics of the oil gas and rock on the logging are used to study the oil gas and the strata comparison. According to the new data, detailed seismic horizon calibration is done and the structures of the study area in the earthquake are reinterpreted. According to the law of the depositional cycle, the thickness of formation, the development characteristics of the single reservoir, the rhythmic features and the possibility of the oil of the oil layer, the stratigraphic division is done. On the basis of core description, analysis and logging data, the regional sedimentary system are analysed, and then utilizing the sign of sedimentary facies and the features of logging, the types of the sedimentary microfacies in depositional time are divided. Through the observation of cores and the identification of the indoor thin section, the characteristics of reservoir petrology are studied, and meanwhile the characteristics of the rock composition are analyzed. By studying the distribution characteristics of reservoir porosity and permeability and the relationship among the reservoir four properties, the well logging interpretation models of the shale content, porosity and permeability are established. Adopting stochastic modeling, this article establishes the three-dimensional structural model, reservoir sedimentary facies model and the attribute model including the porosity, permeability and oil saturation through the Petrel software. Through the above researches, we can learn that the top structure of Kexia reservoir in WU66 Well block is a large-scale nose-like structure formed by the two thrust blocks, the oil layer of S7 is divided into three sand layers, in total 13 small layers, and the S71-4、S72-4、S73-2、S73-3 are major reservoirs. The type of the reservoir is affected by fault - lithologic reservoir. Kexia reservoir in WU66 Well block is the small delta deposition transformed by the strong wave, and the main subfacies is delta front, and the micro facies are mainly delta front underwater distributary channel and the distributary bay. From the 3D geological model, we can see that the porosity, the permeability and the oil saturation of Kexia reservoir in WU66 well block have a very strong heterogeneity.