我国低煤阶煤煤层气地质研究综述

发布时间：2018-05-14 21:22

  本文选题：煤储层 + 煤层气　； 参考：《煤炭科学技术》2017年01期

【摘要】：针对当前我国低煤阶煤煤层气尚未实现区块、盆地层次上商业化开采的现状,为加深对以“可采性”为核心的低阶煤层气开采地质条件的认识,从低煤阶煤煤层气成因、煤储层特性、煤层气成藏模式等方面,系统总结了我国低煤阶煤煤层气基础地质特征研究的最新进展,并指出了研究过程中所存在的问题及今后的发展趋势。结果表明:低煤阶煤煤层气具有3类成因及多气源补充的特点;煤储层宏观裂隙张开程度及连通性好,基质孔隙度较大,具有吸附时间短、解吸效率高、扩散量低,扩散系数和扩散率较高,渗透率偏低的特征;气源补给与保存条件是控制低阶煤含气量的关键。目前低煤阶煤煤层气勘探开发仍需解决4个方面的地质问题:1以现有的工艺技术水平界定低煤阶煤煤层气形成工业气流的含气性参数下限;2通过储层敏感性评价及主控地质因素研究实现储层可改造性预测;3三相态时空分布规律及各相态的地质控制因素是探寻低煤阶煤煤层气富集规律及有利地质条件的核心问题;4建立以“可采性”为核心的低煤阶煤煤层气可采地质模式与地质选区评价体系。
[Abstract]:In view of the current situation of commercial exploitation of low rank coal-bed methane in China, which has not yet been realized at the basin level, in order to deepen the understanding of the geological conditions of low-rank coal-bed methane exploitation with "recoverability" as the core, the origin of low-rank coal-bed methane is analyzed. In the aspects of coal reservoir characteristics and coalbed methane accumulation model, this paper systematically summarizes the latest progress in the study of basic geological characteristics of coal bed methane with low coal rank in China, and points out the problems existing in the research process and the development trend in the future. The results show that coal bed methane with low rank coal has three types of genesis and multiple gas sources, and the macroscopic crack opening degree and connectivity of coal reservoir are good, the matrix porosity is large, the adsorption time is short, the desorption efficiency is high, and the diffusion amount is low. The characteristics of high diffusion coefficient, high diffusivity and low permeability, and the recharge and preservation conditions of gas source are the key to control the gas content of low rank coal. At present, the exploration and development of coal bed methane with low rank coal still need to solve four aspects of geological problems: 1. Defining the lower limit of gas content parameters of industrial gas flow from coal bed methane of low rank coal with existing technical level through reservoir sensitivity evaluation The study of the main controlling geological factors and the realization of the reservoir remolding prediction of the three-phase space-time distribution law and the geological control factors of each phase are the core problems in exploring the enrichment law and favorable geological conditions of coal-bed methane of low rank coal. Low rank coal-bed methane recoverable geological model and geological selection evaluation system with "recoverability" as the core.
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本文编号：1889468