双侧向幅度差异评价裂缝参数在油田中应用

Application of Dual Laterolog Range Differences in Evaluation Fracture Parameters to Oilfield

西部油田奥陶系为一套基质孔隙度和渗透率低,且裂缝发育的裂缝性碳酸盐岩储层。碳酸盐岩裂缝性储层空间类型多、变化大,裂缝评价难度大。钻探取心和成像测井资料观察是了解储层天然裂缝是否发育最可靠、最直接的方法,但成本昂贵。在利用常规测井方法识别裂缝时,双侧向测井具有较强的聚焦能力,对于探测高阻层裂缝特别有效。本文在前人对双侧向测井响应的数值模拟及反演方法研究基础上,建立了一套裂缝性储层参数解释模型来估算西部油田奥陶系裂缝参数,并将其结果与岩心、成像测井及试油资料对比检验,得到了充分的验证,说明该套估算裂缝参数的方法在该油田奥陶系的可行性和有效性。

The Ordovician Formation of the Tazhong Gas Field, located in the Tarim Basin, is a set of fractured carbonate reservoir with low matrix porosity and permeability. For carbonate fractured reservoir, its space is characterized by different types and large variation. For the study of fractured reservoir, the drill core and imaging logging data are the most straightforward and credible means to discern the development situation of natural fracture in the reservoir, but these are expensive. In the traditional logging methods, the Dual Lateral Logging （DLL） is of stronger competence of convergence and it is very useful to recognize the fractures in the resistive formation. In this study, some previous researches on both numerical simulation and inverse method of DLL response are firstly summed up; and then a series of parameter interpretation models for fractured reservoir are developed to estimate the fracture parameters in Tarim oil field; finally, the estimated results are compared with the core, the imaging logging data and well--testing data. Result shows that this method to estimate fracture parameters is effective in the application of this area.