用地震资料提高储层参数插值精度的新方法——3-D协克里格与主成分下沉法

3-D Cokringing and dominant content subsidence: a new method for improving reservoir parameter interpolation by using seismic data.

本文运用 3- D协克里格方法将地震资料和井孔数据结合 ,从而提高了油藏参数插值精度。 3- D协克里格技术适用于远离井区的油藏参数模拟 ,通过加入地震特征信息 ,使得油藏参数的插值精度比单纯使用从井孔获得的硬数据高 ,从而成功地实现了采样密度高、分布范围广的地震特征数据 (软数据 )和从井孔获得的硬数据的融合。在选取地震特征时通过主成分分析法降低地震特征数据的维数 ,并提出利用主成分下沉法获得采样点的协变量来避免采用平均井点参数值的方法 ,因此提高了参数模拟精度。同时也为地震数据 (软数据 )和井孔数据 (硬数据 )的结合提供了一条新途径。本文采用胜利油田埕岛南区的实际数据对该方法进行了验证 ,效果明显。

D Cokringing method is used to combine seismic data with borehole data, thus improving reservoir parameter interpolation. 3 D Cokringing method is suitable to reservoir parameter modeling that is far from borehole area. The joint use of seismic characteristic data and borehole data brings satisfactory reservoir parameter interpolation results which are better than those derived only from borehole data, hence achieving reasonable combination of wide and densely sampled seismic characteristic data with borehole data. The dimension of seismic characteristic data is reduced by analysing dominant seismic content in selecting seismic characteristics, and the use of averaged borehole parameter is avoided by deriving the sampling point covariants from dominant content subsidence method, thus improving the accuracy of parameter modeling. The method also serves as a new way to combine seismic data with borehole data. The check result of real data taken from south Chengdao area in Shengli Oilfield proves the method very effective.