陆相盆地破碎断块区储层预测方法研究

Reservoirs predictionmethod of broken fault-block area in land dacies Basin

1. 中国地质大学，北京100083;2. 中国石油化工股份有限公司石油勘探开发研究院，北京100083;3. 中国石油天然气集团公司华北石油管理局录井公司，河北任丘062500

China University of Geosciences, Beijing 100083, China

陆相盆地破碎断块区具有砂体单层厚度薄、横向连续性差、地震反射紊乱等特征,采用常规的储层预测方法很难得到好的预测效果。针对这一问题,进行了储层预测综合方法研究:①采用高分辨率层序地层分析方法和相干体技术建立高精度地层约束模型;②采用地质约束的测井归一化处理、多道记录自相关统计、精确的井震标定等手段建立精确的测井约束模型;③利用沉积相约束反演过程,地质因素约束储层解释过程,使预测结果更符合地质规律。利用以上方法在东濮凹陷某三维地震工区进行了储层预测,预测的砂体分布趋势与沉积微相的解释结果相关程度较高,符合该区的地质规律。

In broken fault-block area of land facies basin, single sandstone usually has thin thickness and poor lateral continuity, the formation has unsystematic seismic reflection characteristic. It is difficult to obtain perfect predication results using normal inversionmethod. In view of the problem, a comprehensive reservoirmethod is studied: high resolution sequence stratigraphymethod and seismic coherence analysis technique are used to create high degree stratamodel in seismic inversion process in order to raise reservoirs prediction accuracy;multichannel record autocorrelation statistics, accurate well-seismic calibratemeans and log data normalization with geology conditions restricting are applied to enhance logmodel reliability; Sedimentary facies analysis results are considered as constraint conditions in log constrained inversion to enhance reservoir prediction validity aftermultipled contrast and certification between sedimentary facies and inversion results. By using thismethod, it was revealed that the sandbodies distribution trend and sedimentarymicrofacies analysis results have high cor-relativity in Dongpu depression.