中国煤系气形成分布、甜点评价与展望  

Formation,distribution,sweet spot evaluation and development prospect of coal-measure gas in China

作　　者：刘翰林 邹才能[1] 尹帅 赵群[1] 陈艳鹏[1] 马锋[1] 邓泽[1] 东振 林敏捷 侯梅芳[1] 李士祥 李勇[4] 郭秋雷 蔺嘉昊 路冠文 关春晓 孙粉锦[1] LIU Hanlin;ZOU Caineng;YIN Shuai;ZHAO Qun;CHEN Yanpeng;MA Feng;DENG Ze;DONG Zhen;LIN Minjie;HOU Meifang;LI Shixiang;LI Yong;GUO Qiulei;LIN Jiahao;LU Guanwen;GUAN Chunxiao;SUN Fenjin(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;School of Earth Science and Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;CNPC Shenzhen New Energy Research Institute Co.,Ltd.,Shenzhen,Guangdong 518000,China;College of Geosciences&Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Resources,China University of Geosciences,Wuhan,Hubei 430074,China;No.3 Gas Production Plant,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710065,China)

机构地区：[1]中国石油勘探开发研究院,北京市100083 [2]西安石油大学地球科学与工程学院 [3]中国石油深圳新能源研究院有限公司 [4]中国矿业大学(北京)地球科学与测绘工程学院 [5]中国地质大学(武汉)资源学院 [6]中国石油长庆油田公司第三采气厂

出　　处：《天然气工业》2024年第10期1-21,共21页Natural Gas Industry

基　　金：国家科技重大专项秘书处资助项目“新时代我国油气工业科技创新支撑高质量发展战略研究”(编号:2022-5596510-000064)。

摘　　要：为了给中国煤系气勘探开发提供借鉴和参考,基于非常规油气地质学理论及最新研究成果,构建了煤系气甜点区(段)评价方法。研究结果表明:①构建了包含4个要素共计15项指标的煤系气地质-工程甜点评价体系,其中的第一个要素是煤系富气甜点地质参数,应重点评价煤系储层性质及地质力学层变形演化、规模及保存条件;②第二个要素是互层性煤系气渗流能力,要深刻揭示煤系气成藏模式、游离气与吸附气动态转换、天然裂缝发育特征、互层结构跨层渗流及复合断裂系统渗流异质性等;③第三个要素是含气量预测,应构建适合高频旋回互层结构煤系且与产能释放能力相匹配的含气量评价模型,准确评估煤系气资源量;④第四个要素是煤系合压储层改造,要重点评价岩石力学属性、地应力及脆性,结合动态监测技术优化合压效果,形成四维压裂技术方案;⑤煤系气甜点优选应综合考虑烃源性、储集性、含气性、保存性、成缝性、储改性和经济性。中国煤系气未来的发展趋势及建议:①深层煤层气(煤岩气)及铝土岩气将成为煤系气勘探开发的新对象、新方向;②深部煤系非常规天然气聚集成藏理论逐步形成;③强化多尺度孔缝表征、跨层渗流、合压增透、数智化新型天然气工厂排采模式等方面的研究;④联合多学科持续开展各类煤系气资源甜点综合评价,以助力煤系气勘探开发向深部进军。In order to provide references for the exploration and development of coal-measure gas in China,this paper constructs an evaluation system of sweet areas/sections of coal-measure gas based on the recent research results.The system comprises 4 elements involving 15 indexes.And the following research results are obtained.First,the first element refers to the geological parameters of sweet spot in coal measures.As for this element,attention shall be paid to evaluating the reservoir properties of coal measure and the deformation evolution,scale and preservation conditions of geomechanical layers.Second,the second element is the seepage capacity of interbedded coal-measure gas.It is necessary to deeply reveal the accumulation mode of coal-measure gas,the dynamic conversion of free gas and adsorbed gas,the development characteristics of natural fractures,the cross-layer seepage in interbedded structures,and the seepage heterogeneity in composite fault systems.Third,the third element is the gas content evaluation.A gas content evaluation model which suits high-frequency cycle interbedded coal measures and matches with productivity releasing capacity shall be established to accurately assess the amount of coal-measure gas resources.Fourth,the fourth element is the commingled fracturing of coal measures.Attention shall be paid to evaluating rock mechanical properties,ground stress and brittleness,optimizing the commingled fracturing effect by virtue of the dynamic monitoring technology,and preparing a four-dimensional fracturing technology scheme.Fifth,to select the sweet spot of coal-measure gas,it is necessary to take into account the properties of hydrocarbon source,reservoir,gas content,fracture,reservoir stimulation and economy comprehensively.In addition,coal-measure gas presents the following development trend in China.First,deep coalbed methane(coal rock gas)and bauxitite gas will become the new objects and directions of coal-measure gas exploration and development.Second,the theory of unconventional gas accumulat

关 键 词：煤系气 煤岩气 甜点 评价要素 地质参数 渗流能力 含气性评价 合压储层改造 

分 类 号：TE132.2[石油与天然气工程—油气勘探]