应用随机模拟方法预测岩性圈闭

Prediction of lithologic traps using stochastic simulation

波阻抗与岩性之间具有一定的概率相关关系。综合应用多学科信息进行岩性圈闭的随机建模研究 ,基本步骤包括 :建立井眼岩性的一维模型 ,作为三维岩性建模的控制数据 ;测井约束三维地震反演 ,获取高分辨率的三维波阻抗数据体 ;对波阻抗与岩性进行概率相关分析 ;根据沉积相类型选择随机建模方法后 ,进行地质统计特征分析 ;在三维构造建模的基础上进行三维岩相随机建模 ,获取多个模拟实现 ,进行多解性评价。以东营凹陷营 11区块沙河街组滑塌浊积扇岩性圈闭随机模拟为例 ,说明这一研究过程的基本步骤。图 4参

Probability correlative relation exists between acoustic impedance (AI) and lithology. The relation can be applied to make an effective prediction of lithologic traps by synthetically using the stochastic modeling method and multi disciplinary information. The general processes of this study include: lithology interpreting within the wells, as the constraining data of 3 D lithology modeling; well logging constrained seismic inversion, obtaining high frequency 3 D AI data; probability relation analysis between AI and lithology; selecting the methods of stochastic modeling based on facies type and then making the analysis of geologically statistical characteristics; 3 D stochastic modeling based on 3 D structural model, obtaining various alterative simulation realizations; then making assessment on multi explanations of lithologic trap forecasting realization. A case study of lithologic traps of turbidite fan deposits in Ying 11 district of Dongying Sag, Jiyang Depression, Bohai Bay Basin is carried out to show the general process of this research.