波形分析方法在碳酸盐岩储层预测中的应用

Prediction for carbonate reservoirs by waveform analysis.

碳酸盐岩储层预测一直是一世界性难题,塔河油田奥陶系碳酸盐岩也不例外,而且其储层埋藏深(大于5300m),储集空间以后期构造及成岩作用形成的溶蚀孔洞及裂缝系统为主,纵、横向非均质性强。通过分析数10口井的钻井结果,细致类比过井地震剖面上地震反射波形特征,并结合模拟实际地层的正演模拟结果,总结出了储层发育与其地震反射波形之间的相关性,建立了应用波形分析预测碳酸盐岩储层的技术。

Prediction of carbonate reservoirs has ever been a problem worldwide. There is no exception for the Ordovician carbonate reservoirs in Tahe oilfield, which are of deep buried depth (more than 5300 m) , and strong lateral and horizontal heterogeneity because the reservoir spaces are mainly water-eroded caves and fractures formed during tectonization and diagenesis. Based on a meticulous correlation between the seismic reflection characters and the drilling results in dozens of wells, as well as forward modeling, the author established a relation between reservoir occurrence and the waveform of seismic reflections, which forms a basis for carbonate reservoir prediction by waveform analysis.