【作者】 皇甫玉慧； 康永尚； 邓泽； 池海； 王单华； 姜杉钰； 孙天竹； 焦建； 刘翰林； 顾娇杨； 吴凡；

【Author】 Huangfu Yuhui;Kang Yongshang;Deng Ze;Chi Hai;Wang Danhua;Jiang Shanyu;Sun Tianzhu;Jiao Jian;Liu Hanlin;Gu Jiaoyang;Wu Fan;College of Geosciences,China University of Petroleum(Beijing);State Key Laboratory of Petroleum Resources and Prospecting;Langfang branch of China Petroleum Exploration and Development Research Institute;No.109 Exploration Team,Neimenggu Autonomous Region Bureau of Coalfield Geology;CNOOC China Limited,Unconventional Oil & Gas Branch;China United Coalbed Methane Corporation,Ltd.;

【机构】 中国石油大学(北京)地球科学学院； 油气资源与探测国家重点实验室； 中国石油勘探开发研究院廊坊分院； 内蒙古煤田地质局109勘探队； 中海石油(中国)有限公司非常规油气分公司； 中联煤层气有限责任公司；

【摘要】 海拉尔盆地旧桥凹陷是重要的低煤阶区,但勘探程度较低,煤层气主控因素和富集规律认识不足,制约了开发实践。为查明该区煤层气的成藏主控因素以及富集成藏模式,从煤层煤质煤阶特征、煤层厚度、等温吸附特征以及生气条件和保存条件等方面分析勘探方向。结果表明:旧桥凹陷显微煤组分以镜质组为主,煤岩演化程度低,处于低煤阶褐煤演化阶段;煤层厚度21.6～74.3m,单层0.7～22.49m;煤岩兰氏体积2.63～19.68m~3/t,平均值为7.18m~3/t;煤层气含量0～3.23m~3/t,大磨拐河组含气量明显大于伊敏组。综合分析认为:该区煤层气主要为原生生物气,缺少次生生物气补给或补给较少;潜水面较深,700m以下煤层是主要的勘探目标层;同时,下一步勘探工作应对该区是否有次生生物气形成的问题加以重视。更多还原

【Abstract】 The Jiuqiao depression in Hailar basin is an important low rank coal area.However,the degree of exploration is low.The lack of understanding of the main control factors and enrichment laws of coalbed methane constrains development practices.In order to find out the main controlling factors of coalbed methane accumulation in the area and rich integrated gas reservoir model,the exploration direction was analyzed from coal seam coal rank characteristics,coal seam thickness,isothermal adsorption characteristics,as well as gas generation conditions and preservation conditions.The results show:the microscopic coal components in the Jiuqiao depression are mainly the vitrinite group,the degree of evolution of coal is low,and it is in the stage of evolution of low-rank lignite.The thickness of the coal seam is21.6～74.3 m,and the single layer is 0.7～22.49 m.The Langmuir volume of coal is 2.63～19.68 m~3/t with an average of 7.18 m~3/t.The coalbed gas content is 0～3.23 m~3/t,and the gas content of the Damoguaihe Formation is significantly larger than that of the Yimin Formation.Comprehensive analysis thinks:Coalbed methane in this area is mainly primary biogenic gas,and there is less secondary biogas supply or less supply.Submersible water surface is deep,and the coal seam below 700 m is the main exploration target layer.At the same time,the next exploration work should pay attention to the issue of secondary biological gas formation in the area.更多还原