煤层气含量影响因素及预测方法
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摘要
为了提高煤层含气量预测效果,更准确地评价煤层气资源量、预测煤层气开发前景,以及制定合理的开发方案,基于大量文献调研,首先梳理了煤层气及煤层含气量的概念、影响因素,其次对煤层含气量预测方法的特点进行了比较分析,进而开展了煤层含气量预测方法发展趋势分析.研究表明,煤层舍气量的影响因素主要包括煤的变质程度、温度、压力、煤质、煤层有效埋藏深度、储层有效厚度、储层物性等,其中,煤变质程度起着根本性作用.煤层含气量定量预测方法主要有等温吸附曲线法、含气量梯度法、测井法、地震法等.合理选择煤层含气量预测方法,开展多学科、多种预测方法综合预测含气量研究、研发新的煤层含气量预测方法是煤层含气量预测的主要发展趋势.
In order to improve the prediction result of coalbed methane gas content and accurately evaluate coalbed methane (CBM) resources,predict coalbed methane development prospects as well as make the rational development coalbed methane plan, based on a lot of literature research,the writher summarizes the concept of CBM and the influencing factors of gas content firstly,secondly compares and analyzes the characteristics of coalbed methane gas content prediction methods,and finally discusses the development trend of the coalbed methane gas content prediction methods.It is shown that the main factors of affecting coalbed methane gas content include coal rank,temperature,pressure,coal quality,effective burial depth of coal seam,the effective thickness of the coal reservoir and the reservoir properties.Of the factors,the coal rank plays a fundamental role in the degree of coal metamorphism.The quantitative forecasting methods of coalbed methane gas content mainly include the isotherm adsorption curve method,gas content gradient method,well logging method,seismic method.The development trend of the coalbed methane gas content prediction method is reasonably choosing existing coalbed methane gas content prediction methods and developing new comprehensive prediction methods by carrying out the multidisciplinary research.
引文
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