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鄂尔多斯盆地子洲气田已发现多个致密气藏,其中山2段具有较大的开发潜力,但由于山2段储集层物性差、孔隙结构复杂,储层含气与否,其测井响应的差异性较小,尤其利用单一常规测井方法不能有效识别气水层。以子洲气田山2段致密气藏为研究对象,通过对典型气水层测井响应特征的翔实分析和深入解剖,得知三孔隙度测井对致密气水层均具有一定的敏感性,但对物性较差的气层、气水同层与水层识别精度较低。为了突出致密储层中气体对测井响应的贡献量,利用密度和声波时差测井构建了视波阻抗参数,进而制作了用于识别研究区致密气层的视波阻抗-补偿中子交会图版。利用该图版对研究区致密储层气水层进行了识别,识别结果与气测录井、试气成果对比表明,该方法能够较有效地识别致密储层的流体性质,对相邻区块内的流体性质识别具有参考价值。
Several tight gas reservoirs have been found in the Zizhou gas field in the Ordos Basin. The second member of the second member of the Ordos Basin has great potential for development. However, due to poor physical properties of the reservoir in the second member of the Ordos Basin, complicated pore structure and gas in the reservoir, the logging response The difference is small, especially the single conventional logging method can not effectively identify the gas-water layer. Taking the tight gas reservoir of the Member 2 of Zizhou Gas Field as the research object, through the detailed analysis and in-depth anatomy of the logging response characteristics of the typical gas-water layer, it is found that the three-porosity logging has some sensitivity to the tight gas and water layer, However, for gas reservoirs with poor physical properties, gas and water identification accuracy is lower in the same layer and in the water layer. In order to highlight the contribution of gas to well logging response in tight reservoirs, the impedance parameters of the wave were constructed using density and acoustic time-lapse logging, and then the impedance-compensated neutron exchange diagram for identifying the tight gas layer in the study area . The gas and water reservoirs in the tight reservoirs of the study area are identified by using the plate. The comparison between the recognition results and gas logging and gas testing results shows that this method can identify the fluid properties of tight reservoirs more effectively, The identification of fluid properties has a reference value.