澳大利亚G盆地煤层气地质建模技术

Geological Modeling of CBM Reservoir in G Basin of Australia

以澳大利亚G盆地煤层气储层为例,介绍煤层气地质建模技术的研究过程。首先基于井上分层数据和地震构造解释数据建立研究区准确的构造格架,再结合综合地质认识和变差函数分析对煤储层岩相模型进行三维模拟。为了准确控制煤储层含气量、灰分的三维分布,采用综合地质认识得到的含气量和灰分的平面分布作为平面趋势约束,以变差函数为控制条件,建立煤岩含气量模型和灰分模型。根据灰分与挥发分、固定碳、水分有良好的负相关性,以灰分模型为协同约束,采用序贯高斯随机模拟的方法建立挥发分、固定碳、水分模型。

Taking CBM reservoirs in G basin of Australia for example,the paper introduces the research process of geological modeling of CBM reservoirs. First of all,the accurate structural framework in the study was built based on division data and seismic structure interpretation data. Then combining comprehensive geological understanding and based on the analysis of the variation function,the lithofacies model of CBM reservoir was simulated. In order to accurately control the gas content of CBM reservoir and ash content of the three dimensional distribution,adopting the comprehensive geological understanding of the planar distribution of gas content and ash content as a trend of plane constraint and variation function as the control condition,which established the gas model content and ash content model. According to the good negative correlation between the ash content and volatile matter,fixed carbon and moisture content,we can adopt ash content model as collaborative constraint and sequential Gaussian random simulation method to establish the volatile,fixed carbon and moisture model.