全数字地震叠前储层预测技术及应用效果

针对苏里格气田盒8段砂岩储层厚度薄、有效储层和围岩波阻抗差异小的难点,在测井岩石物理分析确定储层敏感性参数的基础上,采用叠前反演和AVO属性分析技术,提取储层的弹性参数,对储层岩性、物性及含气性进行综合预测。研究表明,在该区横波阻抗、泊松比可以有效地识别岩性;纵波阻抗与泊松比交会以及不同角度间的弹性阻抗交会能够预测储层的含气性,提高储层的预测精度和钻井成功率。

Full Digital Seismic Prestack Reservoir Prediction Technology and Its Application Results

To solve the bottlenecks of He-3 sandstone reservoirs of Sulige Gas Field, such as thin thickness and small differential of wave impedance of effective reservoirs and enclosing rock, the prestack inversion and AVO property analysis technologies are adopted to acquire the elastic parameters of reservoirs after the sensitive parameters of reservoirs are determined by logging petrophysical analysis, thus predicting the lithological characters, physical properties and gas-bearing characteristics of reservoirs. The study indicates that the horizontal wave impedance and Poisson＇s ratio of this zone can be used to effectively identify the lithological characters. The intersection point of vertical wave impedance and Poisson＇s ratio and the intersection point of elastic impedance of different angles can be used to predict the gas-bearing properties of reservoir, improving the accuracy of reservoir prediction and success rate of drilling wells.