伪熵分析技术在储层预测中的应用

Application of pseudo-entropy analysis technology to reservoir prediction

为了提高地震属性分析技术在储层预测中的有效性,提出了用于刻划地震波复杂程度的伪熵属性。通过对砂泥岩沉积模型的正演结果进行伪熵分析,证实伪熵随沉积结构复杂程度的增加而增大,表明伪熵属性具有指示沉积相带的作用,能够用于沉积相分布预测研究。将该技术应用于砂泥岩薄互层地区的砂岩储层预测,预测精度达到80%;应用于碳酸盐岩储层地区的裂缝型储层预测,其效果优于其他地震属性。

Pseudo-entropy attribute is presented which can describe the complex degree of seismic wave so as to improve the efficiency of the seismic attribute analysis technology in reservoir prediction. The pseudo - entropy analysis on the forward result of a sand - mudstone sedimentary model shows that pseudo - entropy increases as the sedimentary structure becomes more complex. The pseudo - entropy which is good indication for sedimentary facies - belts can be used for sedimentary facies distribution prediction. The prediction accuracy is about 80% when the pseudo - entropy analysis technology is used for sand reser-voir prediction in the area of thin - interbedded sand - mud-stones area. The application effect is better than other seismic attribute when the technology is used for fracured reservoir prediction in carbonate area. It proves that the pseudo - entropy a nalysis technology is a new and reliable method for reservoir prediction.