基于曲线重构的薄储层地震预测技术及应用

Seismic Prediction Technology and Application of Thin Reservoir Based on Curve Reconstruction

摘要: 高13区块扶杨油层储层砂体薄、横向变化快，地震特征对薄砂体反映不明显，储层预测难度大。为了实现研究区目的层薄储层的定量精细预测，采用波形指示模拟方法定量预测薄储层厚度，通过岩石物理分析选取对薄层砂岩敏感的曲线，采用曲线重构技术构建研究区能够识别薄储层的敏感曲线，并通过QC质量监控及试验剖面反演效果对比选取最优反演参数。研究结果表明研究区电阻率曲线和波阻抗曲线识别储层较敏感，重构后的反演结果可以更好的识别薄储层；扶余油层砂岩累计厚度在5~40 m之间，厚度高值区位于研究区南西部，整体呈北西–南东向条带状展布。杨大城子油层YI油层砂岩累计厚度在15~60 m之间，厚度高值区位于研究区南部，整体呈北西–南东向条带状展布，砂体展布方向与扶余油层相似。

Abstract: The reservoir sand body of Fuyang oil formation in Gao 13 block is thin with fast lateral variations. The seismic features do not significantly reflect the thin sand body, so it is difficult to predict the reservoir. To achieve a quantitative precise prediction of the thin reservoir of the target layer in the study area, the waveform indication simulation method is used for quantitative prediction of thin reservoir thickness. Through rock physics analysis, the curve sensitive to thin layer sandstone is selected. Curve reconstruction technology is utilized to build a sensitive curve that can identify the thin reservoir in the study area. The optimal inversion parameters are selected through QC quality monitoring and comparative analysis of the test profile inversion effects. The results show that the resistivity curve and wave impedance curve in the study area are more sensitive to identify the reservoir, and the reconstructed inversion results can better identify the thin reservoir. The total thickness of the sandstone in the Fuyu oil layer ranges from 5 to 40 m, with a high-thickness area located in the southwest of the study area, generally distributed in a northwest-southeast strip. The cumulative thickness of the sandstone in the YI oil layer of Yang Dachengzi ranges from 15 to 60 m, with a high-thickness area located in the south of the study area, generally distributed in a northwest-southeast strip, and the sand body distribution direction is similar to that of the Fuyu oil layer.