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- Several coal beds are developed in backswamp deposits. 河漫沼泽上发育多套煤层。
- It is a new way of the utilization of coal bed gas. 为井下抽放煤层气的利用提出了一条新的途径。
- Coal Bed Methane Drilling and Completion Technology in Western Basin of U.S. 美国西部盆地煤层气钻井和完井技术。
- The abundant plant fossils in coal beds indicate that they originated in warm, freshwater-swampy forests, much as peat bogs form now. 在煤层中出现的大量植物化石表明，煤是形成于温暖的具新鲜水的沼泽森林之中，很像现今的泥炭沼泽环境。
- Preliminary research on structural law of coal bed beneath nappe in No. 对新集二矿推覆体下煤层构造规律进行了初步研究。
- Graphite deposit of Heye was formed by metamorphism of the Permian coal bed. 荷叶石墨矿是由二叠系煤层变质而成的石墨矿床,石墨与煤呈同层异矿关系。
- The extensively presence of coal beds indicates vast hydrocarbon potential in Xihu Sag. 广泛分布的煤层揭示了西湖凹陷广阔的生烃潜力。
- There are many coal beds and various coal ranksni Jixi basin, which is a Mesozoic and cenozoic coal basin. 鸡西盆地是一个多煤层、多煤种的中、新生代聚煤盆地,丰富的煤炭资源为煤成气的形成提供了充足的物质基础。
- Field applications show that this technique can effectively prevent coal beds sloughing and decrease hole problems and drilling accidents. 现场应用表明,该技术能有效地防止煤层坍塌,减少井下复杂情况及事故。
- Radioelement existing in domestic coal beds is discharged into atmosphere,solid and water environment via medium of smoke coal ash and slag etc. 国内煤层中普遍存在的天然放射性核素,通过燃煤产生的烟气、煤灰渣等介质进入空气、土壤和水环境中。
- In Bijie Coal Field, coal beds are many and steady, coal quality is good and resources are rich, associated with highquality pyrite. 毕节煤田煤层多而稳定,煤质好,资源量丰富,并伴生有丰富的硫铁矿,开采技术条件简单,潜在经济价值可观。
- Using the well and seismic data,the occurrence and distribution of coal beds in Hailar Basin are evaluated and predicted in this paper. 利用钻井和地震资料,评价和预测了海拉尔盆地煤层的发育和分布,结合煤层含气量参数,预测了盆地内的煤层气资源前景。
- Based on the analysis of mechanism of wellbore unstability, a series of drilling technical measures in coal beds are put forward. 在分析煤层井壁失稳机理的基础上,对影响煤层井壁失稳的因素进行了逐一剖析,提出了一整套煤层安全钻进的技术措施。
- M2B tools acoustic amplitude and variable density signals become distortional in large boreholes, slow formation such as coal beds, and so on. 但该仪器在大井眼、煤层等慢速地层、低密度固井井段,声幅及变密度曲线有失真现象。
- Porosity logging methods examining gas reservoirs of sandstone and argillaceous sandstone through acoustic wave and density are effectively used in coal beds. 煤田中在煤层附近有煤层气砂岩储层、泥质砂岩储层的存在,声波、密度两种孔隙度测井是进行孔隙度探测的有效方法。
- Hydrocarbon generated from Middle-Lower Jurassic coal beds as the main source rock in the basin has remarkably high Pr/ph ratio as well as heavy carbon isotope and C29 sterane. 中、下侏罗统煤系地层是主要的烃源岩，这套源岩生成的油气具有显著的姥鲛烷优势、重碳同位素以及富含C29甾烷等特征。
- Therefore the thermal evolution course experienced by the coal beds can be reflected by coalbed methane component and its carbone isotope characteristics. 反之，煤层气的组份和组份碳同位素特征也反映了煤层所经历的热演化过程。
- The synthetic sloughing mechanism of coal beds in Jurassic and Triassic systems of Tarim Basin was studied by using chemical analysis and mechanical methods. 利用化学分析和力学研究,探讨了塔里木盆地依奇克里克区块侏罗系和三叠系煤层的坍塌机理。
- Moreover the geochemistry of trace elements in coal could be used to explain the coalification,and some elements as special marker could be used to compare the coal beds. 另外应用元素地球化学理论可以探讨成煤作用,一些微量元素可以用作煤层对比标志,微量元素对煤炭开采、加工、利用等方面都将产生影响。
- When the subsiding of the basin base became slow down, no marine invasion was found and the basin was dominated by a peat swamp environment in which coal beds were deposited. 盆地基底沉降速率较慢、无海侵作用时，盆地为泥炭沼泽环境，主要发育煤层。
