多参数联合反演预测致密含气砂岩

储层预测的难点在于预测结果的多解性和低分辨率。多参数联合反演预测致密含气砂岩的步骤为:首先利用对地层岩性敏感的自然伽玛曲线来区分砂岩、泥岩；其次利用孔隙度反演剔除致密砂岩,划分有利储层；最后,合理进行含气特征曲线重构反演,有效地识别了含气砂岩储层。通过对川南须家河组致密含气砂岩储层进行综合预测表明:多参数联合反演方法可精细预测致密含气砂岩储层的厚度和空间展布规律,预测结果与钻井解释吻合度好。

Multi-parameters Joint Inversion Technology Predicts Gas-Bearing Tight Sandstone

The difficulties of reservoirs prediction lie in multi-|results and low resolution. The multi-parameters joint inversion in the prediction of gas-bearing tight sandstone is carried out. First of all, sandstone and mudstone can be differentiated by gamma ray log curve which is sensitive to formation lithology. Secondly, tight sandstone can be removed by porosity inversion to find out favorable reservoirs. Finally, gas-bearing tight sandstone can be effectively identified by inversion of the reasonable log curve reconstruction. The results of reservoir prediction for gas-bearing tight sandstone in Chuannan area indicate that it can finely predict the thickness and distribution of the gas\|bearing tight sandstone. Its prediction result coincides with the actual result.