那么，究竟什么是"煤岩气"？其核心区别在于：传统煤层气以"吸附"状态为主，而煤岩气则是"游 离态和吸附态并存"，且"游离气含量高"。它呈现出一种"跨界"特征：赋存特征接近页岩气，开发方式 则与页岩气、致密气相似。 鉴于这种显著差异，中国石油勘探开发研究院研究团队根据勘探开发实践需要，正式提出了"煤岩 气"（Coal-rock Gas, CRG）这一全新概念。这一重大理论创新的背后，是更宏观的"全油气系统"理论的 支撑。传统石油地质学理论在解释无明确边界的非常规油气时存在局限。中国科学院贾承造院士于2014 年提出"全油气系统"理论，用统一的视角将常规与非常规油气资源统摄于一个完整体系中。在此框架 下，中国石油勘探开发研究院的科学家们提出了以含煤地层为核心的一种新类型全油气系统，即"煤系 全油气系统"。在该系统内，常常共生形成煤岩气、煤层气、致密气、页岩气等多种气藏的组合。这一 理论也科学地解释了煤岩气"开井即见气—中后期解吸接力"的典型产能过程。 来自中国石油煤岩气重点实验室的一项最新研究成果显示，我国煤岩气地质资源量可达50万亿立方 米，这是一个数十万亿方级别的"新粮仓"。其中鄂尔多斯盆地资源量超25万亿立 ...

Core Insights - The emergence of "coal-rock gas" as a new unconventional natural gas resource is highlighted as a significant development in China's natural gas production [1][2] - As of October 2025, China's proven geological reserves of coal-rock gas are expected to exceed 700 billion cubic meters [1] - The concept of coal-rock gas was officially introduced at the 43rd "Cambridge Energy Week" in March 2025, distinguishing it from traditional coalbed methane [1][2] Group 1: Definition and Characteristics - Coal-rock gas is characterized by the coexistence of free and adsorbed gas, with a higher content of free gas compared to traditional coalbed methane, which primarily exists in an adsorbed state [1] - The new concept of coal-rock gas (Coal-rock Gas, CRG) was proposed based on exploration and development practices, reflecting its unique characteristics that align more closely with shale gas [1][2] Group 2: Theoretical Framework - The development of coal-rock gas is supported by the "total oil and gas system" theory, which integrates conventional and unconventional oil and gas resources into a unified framework [2] - The "coal system total oil and gas system" proposed by scientists at the China Petroleum Exploration and Development Research Institute explains the coexistence of various gas reservoirs, including coal-rock gas, coalbed methane, tight gas, and shale gas [2] Group 3: Exploration and Development Progress - China's coal-rock gas exploration has shown a trend of "multiple breakthroughs and rapid growth," with geological resource potential estimated at 50 trillion cubic meters [2] - Significant achievements have been made in the Ordos Basin, including the discovery of three large gas fields with geological reserves exceeding 500 billion cubic meters and the establishment of the first million-ton deep coal-rock gas field, the Daji Coal-rock Gas Field [2] Group 4: Production Forecast - National coal-rock gas production is projected to reach 2.7 billion cubic meters in 2024, with expectations to exceed 4 billion cubic meters in 2025 [3] - By 2035, China aims to establish a production capacity of over 30 billion cubic meters of coal-rock gas, with potential for further discoveries of condensate oil and gas reservoirs [3]