用测井资料评价煤储层顶底板封盖性的方法

Methods for Evaluating Capping Capacity of Roof and Floor of Coal Reservoir with Logging Data

本文介绍了用测井资料评价煤储层顶底板封盖性的四种方法。包括:用常规测井资料计算煤储层顶底板围岩的岩性比、厚度的方法;用核磁测井进行煤储层顶底板孔隙性、含水性和孔隙结构分析的方法;用微电阻率扫描成像测井进行煤储层顶底板裂缝发育程度与连通性评价的方法;用阵列声波测井资料提供的岩石力学参数进行煤储层及其顶底板地层含气性、天然裂缝及渗透性、地层各向异性等分析的方法。论述了煤储层顶底板封盖性的好与差在以上四种评价方法上的测井响应特征各不相同。

This paper describes four methods for evaluating the capping property of roof and floor of coal seam. They are ： （ 1 ） the method for computation of lithology ratio and thickness of roof and floor of coal reservoir by using the conventional logging data; （2） Nuclear magnetic logging method for analysis of po rosity, water carrying property and pore structure of roof and floor of coal reservoir; （3） Method for eval uating fracture development and connectivity of the roof and floor using micro resistivity scanning and imaging log; （4） Analysis of the gassiness, natural fracture, permeability and formation anisotropy of the coal reservoir and its roof and floor using rock mechanics parameters obtained from array sonic logging da ta. This paper discusses the different logging response of the seam roof and floor in the above evaluating methods.