碎屑岩储层物性参数地震预测方法探讨

PREDICTING LITHOLOGIC PARAMETERS FOR CLASTIC RESERVOIRS

石油大学,北京100083

Beijing Petroleum University, Beijing 100083

针对海上地震资料质量高、分布密集且控制范围广但钻井数目稀少的特点,本文对一套新的储层物性参数计算方法进行了讨论。文中根据怀利公式,即时间平均方程和安吉利里将此平均方程应用于三相介质的理论,提出了扩展时间平均方程,能够较好地在钻前根据地震绝对速度估算出含泥质砂岩储层的孔隙度;而新提出的趋势压力预测模型和精细压力预测模型则可在无井或少井的探区内,依据地震纵波速度转换出地层压力以及过剩地层压力。LX凹陷北洼试用的结果表明,这些方法具有较高的使用价值。

In view of the marine survey's distinguishing features including the high quality seismic data, densely scattered survey lines and sparse well drilling, this paper will have a discussion on a number of new algorithms related to the extraction for reservoir's lithologic parameters. It's concluded that the extended time-average equation proposed on the basis of the Wyllic formula, i. e. the time-average equation and Angeleri's philosophy of applying the equation to 3-phase mediacan serve to estimate the porosity parameter for muddy sand reservoirs prior to drilling, while the newly proposed model for predicting presure trends and the model for precisely predicting presures are suited for mapping P-wave velocities into formation presures and excess formation presures in regions where very few wells even no well Were drilled. The experimental results obtained in the north of the LX sag show that these methods are possessed of high value.