塔里木盆地塔中地区良里塔格组礁滩体储层地震预测

Seismic Prediction of Reef-shoal Reservoir of Lianglitage Formation in Tazhong Area

碳酸盐岩储集空间以溶洞和裂缝为主,在接近奥陶系灰岩表面,由于储集空间填充物与上覆地层岩石物理特性较为接近,造成直接利用地震数据对储层预测的不精确性,给储层地震预测带来很大困难。在假定地震属性与储层呈线性关系条件下,以交叉检验误差最小为准则,在提取的众多地震属性中,优选有利于储层描述的几组地震属性,在选定的地震属性参数空间结合RBF非线性算法,建立了地震属性关于储层的映射关系,并通过地震属性参数空间适应性分析,给出了各局部预测结果可信度评估结果。在新疆塔中油田良里塔格组礁滩体地震预测中见到较好效果。

In close to the surface of the Ordovician limestone,carbonate reservoir spaces are mainly based on cave and fracture.Because of the close proximity of rock physical properties to the reservoir spaces fillings and overlying strata,the seismic data can not be used directly to predict the reservoir.Assuming that seismic attribute and reservoir are not linearly related,taking the least cross validation error as a guide line,several sets of seismic attributes which are in favor of reservoir characterization are chosen during many extracted attributes,the mapping relations on reservoir are established in the chosen parameter spaces combined with RBF nonlinear algorithm.Local reliability evaluation results are given by doing adaptability analysis on parameter spaces of seismic.Seismic prediction of reef-shoal reservoir of Lianglitag Formation in Tazhong obtained good effect based on the research.