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Copyright of Journal of Mining Science & Technology is the property of Journal of Mining Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Geology & Exploration is the property of Xian Research Institute of China Coal Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Geology & Exploration is the property of Xian Research Institute of China Coal Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of Soil & Water Conservation is the property of Bulletin of Soil & Water Conservation Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Selected areas evaluation of coalbed methane has always been an important link in the process of coalbed methane (CBM) exploration，in which the evaluation method is the key to favorable area. The methods gradually developed from the qualitative evaluation to quantitative evaluation in recent years. This paper uses southern Junggar Basin as an appraisal area. Firstly，five typical kinds of evaluation methods are discussed，in which the merits and demerits are systematically expounded. It is founded that qualitative evaluations are still practical，although quantitative evaluations have improved the veracity of evaluation，subjectivism and empirical judgments are still existed in the process of quantitative evaluations to some extent. Based on the differences and similarities of the five evaluation methods，principal component analysis (PCA) has been proposed for the purpose that avoids the subjectivism and empirical judgments. The Sigonghe to Dahuangshan area has been selected as a favorable area by PCA method，the same result is generated by the five evaluation methods，which proves that the PCA method is feasible in selecting the favorable CBM areas，and its greatest advantage is to avoid the subjectivism. The authors advocate that the thought of “first qualitative judgment，second quantitative analysis，and final qualitative verification” should be used to select favorable CBM areas. [ABSTRACT FROM AUTHOR]

Linxing block，located in the eastern part of the Ordos basin, is one of the key areas of exploration and development of unconventional gases in coal series, in China. This paper discusses the paragenesis and enrichment law of coal measure gases and their control factors of Linxing block from the point of tectonic-thermal effect. Impacted by the intrusion of Zijinshan magmatic rock mass, the regional monocline tectonic pattern was superimposed into three secondary structural units, named as central uplift zone, annular fold zone and monocline structural belt, and the difference of deformation characteristics in secondary tectonic units determined the different paragenesis types and enrichment features of coal measure gases. The geothermal gradient and reservoir pressure gradient in coal series decreased in order from the central uplift belt, which leads to the lower gas content of coalbed methane and shale gas, but tight sandstone gas showed opposite trend. The distribution of groundwater salinity showed that the hydrodynamic condition of the annular fold belt was the weakest so that where was favorable for the adsorption gas preservation. According to the characteristics of main control factors of gas enrichment in different secondary structural units, the coal measure gases reservoir models have been proposed with “magmatic intrusive type→syncline and hydraulic sealing type→low-angled monocline and lithologic sealing type” which correspond to central uplift zone, annular fold zone and monocline structural belt. [ABSTRACT FROM AUTHOR]