地震物相分析方法与“甜点”预测

Seismic reservoir property facies analysis and sweet spot prediction

地震物相是指地震物性相,即与储层物性相关的、地震弹性参数可分辨的属性类别。不同于地震岩相划分主要考虑岩性因素,地震物相划分不但要考虑岩性而且参考物性,同时要兼顾地震弹性参数的可识别性。为此,经过大量实践,总结提出了一套地震物相体预测计算的实现流程和关键技术。坐标转换技术可以将两个射线弹性阻抗合成一个新的阻抗数据体,用于识别地震物相。地震物相体可用于相控岩石物理统计分析,分地震物相做弹性参数—储层参数规律统计。地震物相分类可以包含储层分级方案,通过预测地震物相分类达到"甜点"预测目的。

Different from the seismic lithofacies mainly defined by lithologic factors,seismic reservoir property facies is related to reservoir physical properties and can be identified by seismic elastic parameters,which should take lithology and reservoir physical properties into account,as well as the identifiability of seismic elastic parameters in seismic facies classification.So after amount of experiment,we proposed a computation workflow and key techniques for the prediction of seismic reservoir property facies.Seismic reservoir property facies can be recognized by the coordinate transform technology,which combines two seismic ray elastic impedances into a new impedance data cube.Seismic reservoir property facies cube can be used for facies controlling statistical rock physics analysis and elastic parameter-reservoir parameter law statistics.Moreover,seismic reservoir property facies classifying can contain the reservoir classification scheme,so the sweet spot in the low porosity and low permeability reservoirs will be predicted.