伽马拟声波分频重构反演在储层预测中的应用

Gr Quasi-Acoustic frequency divisions reconstruct seismic inversion and application in reservoir prediction

在地质和地震资料研究基础上,通过岩心、录井和测井分析,探索不同频率尺度测井曲线的储层意义,优选研究区内钻穿古近系底砂岩段砂泥薄互层储层5口探井的储层敏感曲线.在曲线预处理、标准化和敏感性分析的前提下,利用曲线分频拟合,对储层敏感曲线和声波曲线做小波多尺度分解,提取反映薄互层储层岩性变化的中频中尺度伽马曲线和反映地层速度的低频大尺度声波曲线.利用统计模型信息融合构建具有声波量纲的拟声波曲线.在地质研究和沉积演化模式的指导下,运用井约束反演的方法补充地震资料的高频和低频信息,提高地震资料的质量,预测有利储层分布.研究表明,伽马拟声波分频重构反演能有效的提高地震资料的纵向和横向分辨率,刻画复杂地质条件下的薄层储层分布.

This paper on the basis of geological and seismic data research, according to core and logging analysis, to analyses the significance of the reservoir of different logging curve scale. Optimize 5 wells lithology sensitive logging in the research region which it is through the thin interbedded reservoir of lower sand section. On the basis of curve processing, normalization, and sensitivity analysis, applying the principle of logging frequency division, wavelet multi-scale decomposing the lithology sensitive curves and acoustic curves, the middle scale （middle frequencies） GR curves that are responding to the ligthology change of the thin interbedded reservoir sand and the large scale （low frequencies） acoustic logging that are responding to the interval velocity of lower sand section are extracted, and then combined these information referred above to construct quasi acoustic logging using statistical model. Under the guidance of geology research and depositional development model, using the method of well logging constraint seismic inversion to compensate the high frequency and lower frequency, and to complement the resolution of seismic data. Using the inversion results it is readily to predict the sand distribution of thin interbedded reservoirs of lower sand section. It is indicates that curve frequency division quasi-acoustic logging inversion can improve vertical and lateral seismic resolution, which makes the prediction of thin interbedded reservoir in complex geology setting more easily.