小波分析在致密砂岩气层识别中的应用
Application of Wavelet Analysis in Identification of Tight Sandstone Gas Reservoirs

致密砂岩储层孔隙度低、渗透率低、非均质性强，气层所对应的测井响应特征较为复杂，气层识别和评价难度较大，多解性突出.以三水模型、岩心、地质和试气资料为基础，采用能量谱峰值与能量加权累计法定量分析致密砂岩气层的电阻率与自由流体孔隙度组合曲线的小波多尺度能谱特征，以及小波包能量谱特征.组合曲线的多尺度小波能量谱分析方法在致密砂岩气层识别中气层的能量谱与水层的能量谱明显不同，并用其识别苏里格地区的致密砂岩气层.结果表明识别致密砂岩气层能量加权累计法定量分析比小波能量峰分析效果更好.
With the characteristics such as low porosity, low permeability, strong heterogeneity, tight sandstone, and complexlogging response of tight sandstone reservoirs, the gas identification and evaluation are difficult with multiple solutions. The peak energy and a weighted cumulative quantitative are applied in the paper to analyze features of multi-scale wavelet and wavelet packet analysis based on three-water model, cores, geological and gas test data in tight sandstone gas reservoirs. Then the appropriate method of multi-scale wavelet energy spectrum of tight sandstone gas reservoirsis selected to identify tight sandstone gas in Sulige region, which achieved good effect