The development potential of deep-ultradeep coalbed methane resources in the Longtan formation of the upper permian in the Sichuan Basin
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摘要: 准噶尔盆地彩南地区、鄂尔多斯盆地东缘大宁—吉县和延川南区块1 000~2 500 m埋深煤层气井实现高产气流突破，昭示了深部煤层气开发的巨大潜能。四川盆地上二叠统龙潭组薄-中厚煤层群(7~15层)主体埋深2 000~4 500 m，川中一带北倾单斜，局部发育低幅隆起，煤层含气量、含气饱和度、储层压力等开发关键参数全面优于浅部，具备支持“增储上产”国家天然气发展战略的强大潜力。研究表明：(1)龙潭组煤系煤-泥岩互层频繁，煤层层数多，累计资源量大，19号煤层侧向发育稳定(平均3.2 m； >4 m有利面积700 km2)；(2)煤的热演化程度高(2.53%~3.18%)，生烃能力强，煤系气测全烃显示良好，2 500 m埋深处实测含气量16.64~17.61 m3/t，含气饱和度达138%~151%，游离气含量4.84~5.6 m3/t；(3)川南800 m以深实测储层压力系数>1.1，川中一带预测储层压力系数>1.8，为潜在的异常超高压储层。立足四川盆地煤层深部-超深、超压、超饱和等资源禀赋特征，借鉴鄂尔多斯盆地东缘大宁一带深部煤层气成功经验，以19号煤层为风险勘探目标，落实资源潜力和气藏特征，探索构建深部-超深部薄煤层立体勘探开发技术体系，对煤层气规模化建产意义重大。Abstract: The breakthrough in high-yield gas flow in the 1000-2500 m deep coalbed gas wells in the Junggar Basin, the DanningJixian and Yanchuan South blocks signifies the enormous potential for deep coal-bed gas development. The main buried depth of the thin to medium thick coal seam group (7-15 layers) in the Longtan Formation of the Upper Permian in the Sichuan Basin is 2000-4500 meters. In the central Sichuan region, there is a northward dipping monocline with locally developed low amplitude uplifts. The key development parameters such as coal seam gas content, gas saturation, and reservoir pressure are all better than those in the shallow part, which has strong potential to support the national natural gas development strategy of "increasing reserves and production". (1) The Longtan Formation coal seam has frequent coal mud interbedding, multiple coal seams, and a large cumulative resource. The lateral development of the 19 # coal seam is stable (average 3.2 m; >4 m favorable area of 700 km2). (2) The degree of thermal evolution of coal rock is high (2.53% -3.18%), with strong hydrocarbon generation ability. The total hydrocarbon content of coal measure gas shows good results, with a measured gas content of 16.64-17.61 m3/t at a depth of 2500 m, a gas saturation of 138% -151%, and free gas of about 4.84-5.6 m3/t. (3) The measured reservoir pressure coefficient at a depth of 800 m in southern Sichuan is greater than 1.1, and the predicted reservoir pressure coefficient in the central Sichuan area is greater than 1.8, indicating a potential abnormal ultrahigh pressure reservoir. Based on the resource endowment characteristics of coal seams in the Sichuan Basin, such as deep-ultra deep, overpressure, and supersaturation, and drawing on the successful experience of deep coalbed methane in the Daji area of eastern Hubei, taking the 19 # coal seam as the risk exploration target, implementing resource potential and gas reservoir characteristics, and exploring the construction of a three-dimensional exploration and development technology system for deep-ultra deep thin coalbed methane, it is of great significance for the large-scale production of - coalbed methane.
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Keywords:
- Sichuan basin /
- deep-ultra deep /
- coalbed methane /
- reservoir properties /
- resource potential
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[1] 邹才能，马锋，潘松圻，等. 世界能源转型革命与绿色智慧能源体系内涵及路径[J]. 石油勘探与开发，2023，50(3)：633–647. ZOU Caineng，MA Feng，PAN Songqi，et al. Global energy transition revolution and the connotation and pathway of the green and intelligent energy system[J]. Petroleum Exploration and Development，2023，50(3)：633–647.
[2] 徐凤银，侯伟，熊先钺，等. 中国煤层气产业现状与发展战略[J].石油勘探与开发，2023，50(4)：669–682. XU Fengyin，HOU Wei，XIONG Xianyue，et al. The status and development strategy of coalbed methane industry in China[J]. Petroleum Exploration and Development，2023，50(4)：669–682.
[3] QIN Yong，MOORE T A，SHEN Jian，et al. Resources and geology of coalbed methane in China：A review[J]. International Geology Review，2018，60(5–6)：777–812.
[4] TAO Shu，CHEN Shida，PAN Zhejun. Current status，challenges，and policy suggestions for coalbed methane industry development in China：A review[J]. Energy Science & Engineering，2019，7(4)： 1059–1074.
[5] 高德利，毕延森，鲜保安. 中国煤层气高效开发井型与钻完井技术进展[J]. 天然气工业，2022，42(6)：1–18. GAO Deli，BI Yansen，XIAN Baoan. Technical advances in well types and drilling & completion for high–efficient development of coalbed methane in China[J]. Natural Gas Industry，2022，42(6)：1–18.
[6] 秦勇，申建. 论深部煤层气基本地质问题[J]. 石油学报，2016，37(1)：125–136. QIN Yong，SHEN Jian. On the fundamental issues of deep coalbed methane geology[J]. Acta Petrolei Sinica，2016，37(1)：125–136.
[7] 李辛子，王运海，姜昭琛，等. 深部煤层气勘探开发进展与研究[J]. 煤炭学报，2016，41(1)：24–31. LI Xinzi，WANG Yunhai，JIANG Zhaochen，et al. Progress and study on exploration and production for deep coalbed methane[J]. Journal of China Coal Society，2016，41(1)：24–31.
[8] 刘成林，朱杰，车长波，等. 新一轮全国煤层气资源评价方法与结果[J]. 天然气工业，2009，29(11)：130–132. LIU Chenglin，ZHU Jie，CHE Changbo，et al. Methodologies and results of the latest assessment of coalbed methane resources in China[J]. Natural Gas Industry，2009，29(11)：130–132.
[9] 康永尚，邓泽，皇甫玉慧，等. 中煤阶煤层气高饱和–超饱和带的成藏模式和勘探方向[J]. 石油学报，2020，41(12)：1555–1566. KANG Yongshang，DENG Ze，HUANGFU Yuhui，et al. Accumulation model and exploration direction of high–to over–saturation zone of the medium–rank coalbed methane[J]. Acta Petrolei Sinica，2020，41(12)：1555–1566.
[10] 姚红生，陈贞龙，何希鹏，等. 深部煤层气“有效支撑”理念及创新实践：以鄂尔多斯盆地延川南煤层气田为例[J]. 天然气工业，2022，42(6)：97–106. YAO Hongsheng，CHEN Zhenlong，HE Xipeng，et al. “Effective support”concept and innovative practice of deep CBM in south Yanchuan gas field of the Ordos Basin[J]. Natural Gas Industry，2022，42(6)：97–106.
[11] 徐凤银，王成旺，熊先钺，等. 深部(层)煤层气成藏模式与关键技术对策：以鄂尔多斯盆地东缘为例[J]. 中国海上油气，2022，34(4)：30–42. XU Fengyin，WANG Chengwang，XIONG Xianyue，et al. Deep (layer) coalbed methane reservoir forming modes and key technical countermeasures：Taking the eastern margin of Ordos Basin as an example[J]. China Offshore Oil and Gas，2022，34(4)：30–42.
[12] 李国辉，苑保国，朱华，等. 四川盆地超级富气成因探讨[J].天然气工业，2022，42(5)：1–10. LI Guohui，YUAN Baoguo，ZHU Hua，et al. Genesis of super–rich gas in the Sichuan Basin[J]. Natural Gas Industry，2022，42(5)：1–10.
[13] 尹中山，邓轲，刘虎，等. 四川煤层气开发模式研究[J]. 中国煤炭地质，2023，35(1)：32–38. YIN Zhongshan，DENG Ke，LIU Hu，et al. Study on coalbed methane development model in Sichuan Province[J]. Coal Geology of China，2023，35(1)：32–38.
[14] 毕彩芹，单衍胜，朱韩友，等. 四川南部地区川高参1井获煤层气高产工业气流[J]. 中国地质，2018，45(5)：1076–1077. BI Caiqin，SHAN Yansheng，ZHU Hanyou，et al. Industrial gas production of CBM obtained by Well CGC1 in southern Sichuan[J]. Geology in China，2018，45(5)：1076–1077.
[15] 曹清古，刘光祥，张长江，等. 四川盆地晚二叠世龙潭期沉积环境及其源控作用分析[J]. 石油实验地质，2013，35(1)：36–41. CAO Qinggu，LIU Guangxiang，ZHANG Changjiang，et al. Sedimentary environment and its controlling on source rocks during late Permian in Sichuan Basin[J]. Petroleum Geology & Experiment，2013，35(1)：36–41.
[16] 张心罡，庞宏，庞雄奇，等. 四川盆地上二叠统龙潭组烃源岩生、排烃特征及资源潜力[J]. 石油与天然气地质，2022，43(3)：621–632. ZHANG Xingang，PANG Hong，PANG Xiongqi，et al. Hydrocarbon generation and expulsion characteristics and resource potential of source rocks in the Longtan Formation of Upper Permian，Sichuan Basin[J]. Oil & Gas Geology，2022，43(3)：621–632.
[17] CHEN Shida，TANG Dazhen，TAO Shu，et al. In–situ stress measurements and stress distribution characteristics of coal reservoirs in major coalfields in China：Implication for coalbed methane (CBM) development[J]. International Journal of Coal Geology，2017，182：66–84.
[18] ZHANG Zheng，QIN Yong，WANG G X，et al. Numerical description of coalbed methane desorption stages based on isothermal adsorption experiment[J]. Science China(Earth Sciences)，2013，56(6)：1029–1036.
[19] 孟艳军，汤达祯，许浩，等. 煤层气解吸阶段划分方法及其意义[J]. 石油勘探与开发，2014，41(5)：612–617. MENG Yanjun，TANG Dazhen，XU Hao，et al. Division of coalbed methane desorption stages and its significance[J]. Petroleum Exploration and Development，2014，41(5)：612–617.
[20] 傅雪海，秦勇，韦重韬. 煤层气地质学[M]. 徐州：中国矿业大学出版社，2007. [21] 秦勇，郑长东，王博洋，等. 基于等温吸附曲线的煤储层产气潜力定量评价：以黔北地区长岗矿区为例[J]. 天然气工业，2018，38(9)：40–47. QIN Yong，ZHENG Changdong，WANG Boyang，et al. Quantitative evaluation on the gas production potential of coal reservoirs based on isothermal adsorption curves：A case study of the Changgang Field，northern Guizhou，China[J]. Natural Gas Industry，2018，38(9)：40–47.
[22] 周云秋，贺锡雷，林凯，等. 基于动态有效应力系数的地层压力估算方法[J]. 新疆石油地质，2023，44(2)：245–251. ZHOU Yunqiu，HE Xilei，LIN Kai，et al. Formation pressure estimation method based on dynamic effective stress coefficient[J]. Xinjiang Petroleum Geology，2023，44(2)：245–251.
[23] 马新华，谢军，雍锐，等. 四川盆地南部龙马溪组页岩气储集层地质特征及高产控制因素[J]. 石油勘探与开发，2020，47(5)：841–855. MA Xinhua，XIE Jun，YONG Rui，et al. Geological characteristics and high production control factors of shale gas reservoirs in Silurian Longmaxi Formation，southern Sichuan Basin，SW China[J]. Petroleum Exploration and Development，2020，47(5)：841–855.
[24] 唐令，宋岩，赵志刚，等. 四川盆地上奥陶统五峰组–下志留统龙马溪组页岩气藏超压成因及演化规律[J]. 天然气工业，2022，42(10)：37–53. TANG Ling，SONG Yan，ZHAO Zhigang，et al. Origin and evolution of overpressure in shale gas reservoirs of the Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation in the Sichuan Basin[J]. Natural Gas Industry，2022，42(10)：37–53.
[25] 严俊涛，叶新群，付永强，等. 川南深层页岩气旋转导向钻井技术瓶颈的突破[J]. 录井工程，2021，32(3)：6–10. YAN Juntao，YE Xinqun，FU Yongqiang，et al. A breakthrough in the technical bottleneck of rotary steering drilling for deep shale gas in southern Sichuan[J]. Mud Logging Engineering，2021，32(3)：6–10.
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