摘要
为揭示沁水盆地东缘龙泉地区中—高煤阶煤层气成藏富集规律,根据煤炭及煤层气勘探资料和实验测试结果,采用定量与定性分析相结合方法,研究主力开发煤层的厚度、埋藏深度、煤岩煤质、储层物性、含气性、盖层物性及水文地质条件,分析煤层气富集成藏主控因素,建立煤层气成藏模式。结果表明:龙泉地区煤层气成藏条件有利,主力煤层为15号,煤层全区发育厚度为3.90~6.80 m,煤层含气量为4.13~24.24 m^(3)/t;热演化程度较高,镜质组最大反射率为2.09%~2.41%,保存条件好,具备良好煤层气成藏基础;煤层气成藏主要受构造特征、沉积体系、水文地质条件及煤变质作用控制,为单斜—水力封堵型煤层气成藏模式,次级背斜构造高部位为富集高产区。该结果为沁水盆地东缘煤层气勘探开发提供指导。
In order to reveal the reservoir forming and enrichment law of medium high rank coalbed methane in Longquan Area,eastern edge of Qinshui Basin,according to the exploration data and experimental test results of coal and coalbed methane,and using the quantitative analysis method,this paper studies the thickness,burial depth,coal rock and coal quality,reservoir physical properties,gas bearing properties,caprock physical properties and hydrogeological conditions of the main developed coal seams,and analyzes the main controlling factors of coalbed methane accumulation,establish coalbed methane reservoir forming model.The results show that the coalbed methane accumulation conditions in Longquan Area are favorable.The main coal seam is No.15,the development thickness of the whole coal seam is 3.90-6.80 m,and the gas content of the coal seam is 4.13-24.24 m 3/t;the degree of thermal evolution is high,and the maximum reflectance(R o)of vitrinite is 2.09%-2.41%.It has good preservation conditions and has a good basis for coalbed methane accumulation;coalbed methane accumulation is mainly controlled by structural characteristics,sedimentary system,hydrogeological conditions and coal metamorphism.A monoclinal-hydraulic plugging coalbed methane accumulation model is established.The high part of the secondary anticline structure is an enrichment and high-yield area.The results provide guidance for the exploration and development of coalbed methane in the eastern margin of Qinshui Basin.
作者
康玉国
张明
KANG Yuguo;ZHANG Ming(Beijing Dadi Hi-tech Geological Exploration Company Limited,Beijing 100040,China)
出处
《东北石油大学学报》
CAS
北大核心
2022年第3期1-12,I0001,共13页
Journal of Northeast Petroleum University
基金
国家科技重大专项(2016ZX05041-004)。
关键词
沁水盆地
龙泉地区
煤层气
成藏条件
主控因素
成藏模式
次级背斜
Qinshui Basin
Longquan Area
coalbed methane
accumulation conditions
main control factors
reservoiring pattern
secondary anticline
