煤系气研究进展与待解决的重要科学问题

Research progress of coal measure gas and some important scientific problems

煤系气是非常规天然气领域的重要组成部分,也是近年来非常规天然气领域研究的热点。总结煤系气研究进展,明确亟待解决的重要科学问题,对于完善煤系气地质理论、推动煤系气勘探开发具有重要意义。当前煤系气研究进展主要表现在以下5个方面:(1)基于煤系地层沉积特点,总结了煤系气共生成藏的6个基本地质特征;(2)初步划分了煤系气共生组合方式,分析了煤系气4大成藏要素及其配置关系的控气作用;(3)分析了煤系含气系统叠置性地质成因,提出了叠置煤系气系统的识别与评价方法及控制叠置含气系统合采兼容性的地质要素;(4)总结了煤系"三气"共探合采理论研究、技术方法、产层贡献识别技术及合采产层优化组合与"甜点"评价;(5)在煤系气资源评价与有利区预测方面进行了有效的探索性研究。在对研究现状总结的基础上,提出了煤系气领域亟待解决的重要科学问题:(1)煤系气储层精细描述及可改造性评价;(2)煤系气资源评价方法及有利区优选;(3)煤系气开发甜点区(段)评价技术;(4)叠置煤系气系统合采兼容性评价。这些问题的解决,将有利于推动煤系气地质理论发展和煤系气资源的高效开发利用。

Coal measure gas is an important part of unconventional natural gas field,and it is also a hot spot of unconventional natural gas research in recent years.Summing up the research progress of coal measure gas and clarifying the important scientific problems to be solved are of great significance for perfecting the geological theory of coal measure gas and promoting the exploration and development of coal measure gas.The current research progress of coal measure gas can be mainly concluded in the following five aspects:a.summary of six basic geological characteristics of paragenic reservoir of coal measure gas based on the sedimentary characteristics of coal measure gas;b.preliminary classification of paragenesis and assemblage mode of coal measure gas,and analysis of four major controlling factors of coal measure gas and their allocation relationship;c.analysis of the genesis of the superimposition of coal measure gas,and raise of identification and evaluation method of the superimposed coal measure gas system and the geological elements controlling the compatibility of the superimposed gas bearing system;d.summary of the theoretical research,technical methods,recognition technology of production contribution,optimal combination of production layers and"desserts"evaluation of co-exploration and co-production in coal measure gas;and e.some exploratory researches in evaluation of coal measure gas resource and prediction of its prospects.Based on the summary of the present research,four important scientific problems to be solved urgently in the study of coal measure gas are put forward as follows:a.the fine reservoir description and reservoir removability evaluation of coal measure gas;b.evaluation of coal measure gas resources and optimization of its prospects;c.the evaluation technology of development sweet areas(sector)of coal measure gas;and d.co-production compatibility evaluation of superimposed coal measure gas system.The solution of these problems will contribute to the efficient development of coal measure gas resources and the development of its geological theory.