塔河奥陶系薄层状孔洞储集体定量预测方法研究

Quantitative prediction of flaggy reservoir of Ordovician formation in Tahe oilfield

本文以塔河油田非"串珠"薄层状储集体作为研究对象,结合钻井、测井资料,指出薄层状储集体储集空间主要为溶蚀孔洞,主要位于T47不整合面下0~60 m.正演模拟结果证实T47不整合面低频强反射屏蔽了下部薄层状孔洞储集体弱信号,利用多子波地震道分解技术剥离了T47旁瓣强能量,重构数据恢复了薄层状溶蚀孔洞储集体弱信号.采用多子波分解和多属性线性回归融合技术建立了薄层状储集体厚度定量预测方法,降低了单一属性预测的多解性,提高了薄层状储集体厚度预测的准确性.塔河十区东地区应用结果表明,薄层状孔洞储集体预测厚度与实钻厚度的相对误差小于10%,说明该方法取得了较好的应用效果.

The paper took the flaggy reservoir in Tahe oilfield as research objects and pointed out that flaggy reservoir space was solution pore,most in 0~60 meters thick,below T47 according to the well drilling logging data,The result of forward simulation proved that the seismic response of flaggy research was weak and shielded by the strong reflection of T47.The weak seismic signal of the flaggy reservoir can be identified through multi-wavelet decomposition and strong side-lobe energy was stripped through reconstruction technology.The quantitative prediction method was established by multi-wavelet decomposition and multi-attribute fusion with multiple linear regression.The prediction multiplicity of single attribute was decreased and the accuracy was improved.This method was applied in the east of block 10,Tahe oilfield.The relative error between prediction thickness and actual drilling thickness was less than 10%.It proved that the method achieved good application effect.