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油田位于西西伯利亚东南部的西西伯利亚盆地,它是该盆地第一块在古生代获得工业性油气流的油田。该地区的储层绝大部分由石灰岩和白云岩组成,在一些地区还发育了大量的裂缝和溶洞。储层基岩的物性很差,一些油井的生产能力与天然裂缝和溶洞有很大的关系。在俄罗斯的第一个项目采用一套完整的方法来描述裂缝性储层的特点,其步骤包括:①利用BKZ测井处理技术确定井的压裂层段;②光谱成像和高分辨率的地震资料的反演;③油田的构造分析;④储层物性模型的建立;⑤利用连续压裂模型(CFM)建立裂缝分布模型。最终的地质模型可以作为确定新井的依据,天然裂缝系统的大量发育也可确定新井的位置,钻井时发生钻井液的大量漏失间接表明钻遇到裂缝地层。利用FMS测井所记录的井眼的映像表明预测模型和实际结果十分相似,井中包含大量的裂缝和大的溶洞。最终,这口井显示出很好的生产能力,而且是该油田最好的生产井之一。同样,在俄罗斯其他地区的油田也推荐使用这套复杂裂缝储层的模拟试验步骤。
Located in the West Siberian Basin in southeastern Western Siberia, the field is the first oil-field in the basin to gain industrial flow in the Paleozoic. Most of the reservoirs in the area are composed of limestone and dolomite, with numerous fractures and caves developed in some areas. The physical properties of the bedrock of the reservoir are poor, and the productivity of some wells has a great relationship with natural fractures and karst caves. The first project in Russia used a complete set of methods to characterize fractured reservoirs. The steps include: (1) using BKZ logging techniques to determine well fracturing intervals; (2) spectral imaging and high-resolution seismic Inversion of data; (3) tectonic analysis of oilfield; (4) establishment of reservoir physical model; (5) establishment of fracture distribution model by continuous fracturing model (CFM). The final geological model can be used as a basis for identifying a new well. The extensive development of a natural fracture system can also determine the location of a new well. Large losses of drilling fluid during drilling indicate that the drill encountered fractured formations indirectly. The mapping of wellbores recorded using FMS logs shows that the prediction model is very similar to the actual results with a large number of fractures and large caves in the well. In the end, the well showed good productivity and was one of the best producing wells in the field. Similarly, the simulation test steps for this complex fractured reservoir are also recommended for oil fields in other parts of Russia.