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首页> 外文期刊>Journal of natural gas science and engineering >Study of characteristics and formation stages of macroscopic natural fractures in coal seam #3 for CBM development in the east Qinnan block, Southern Quishui Basin, China
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Study of characteristics and formation stages of macroscopic natural fractures in coal seam #3 for CBM development in the east Qinnan block, Southern Quishui Basin, China

机译:Qui水盆地南部沁南东段煤层气发育的3#煤层宏观天然裂缝特征及形成阶段研究

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摘要

Natural fractures including the cleat systems play a key role in the coalbed methane production. Therefore, understanding the natural fracture growth and distribution in coal seams is of great importance for modeling gas flow in coal reservoirs. It is also important for the understanding of hydraulic fracture growth during well stimulation. In this paper, an integrated approach using underground coal wall observations, core log analyses, and image logging interpretation was utilized to study the characteristics of the natural fractures generated under different stages of paleotectonic stress field. As a major coalbed methane production and coal mining seam in China, the coal seam #3 in the east Qinnan block, Southern Quishui Basin is studied for its natural fracture characteristics. The results show that macroscopic natural fractures are well developed in coal seam #3 in east Qinnan block and the nearby areas. Importantly, the fracture scale, densities, in-fillings, and connectivity display marked variations among the fractures developed in different geological age. It is found that there are three groups of exogenous fractures formed during the Yanshanian period in the study area, which are oriented at NE10-19 degrees, NE60-79 degrees, and NE40-49 degrees, respectively. Meanwhile, three groups of endogenous fractures, which are orthogonal to the exogenous fractures, were formed during the same period. They are oriented at NW60-7 degrees 9, NW10-29 degrees and NW40-49 degrees, respectively. These three sets of exogenous and endogenous fractures can be related to the three main episodes of the Yanshanian tectonic movement. Moreover, there are also three groups of exogenous fractures formed during the Himalayan period in the study area, which are oriented at NW60-79 degrees, NWO-29 degrees and NW40-49 degrees, respectively. Meanwhile, three corresponding groups of endogenous fractures were formed from the Himalayan period, which are NE10-19 degrees, NE60-79 degrees and NE40-49 degrees, respectively. These three sets of exogenous and endogenous fractures are also correspondent to the three main episodes in the Himalayan period. The main macroscopic fractures formed in this period were during the second episode, which had the strongest tectonic movement in the Himalayan period. Influenced by the multiple stages of tectonic movements, macroscopic natural fractures are complex and polydirectional in strike in the study area. The results of this study are of great significance for the understanding of coalbed methane production behavior in the east Qinnan block. (C) 2016 Elsevier B.V. All rights reserved.
机译:包括割理系统在内的天然裂缝在煤层气生产中起关键作用。因此,了解煤层天然裂缝的发育和分布对模拟储层瓦斯流动具有重要意义。这对理解增产过程中水力压裂的发展也很重要。本文采用地下煤壁观测,岩心测井分析和图像测井解释的综合方法研究了古构造应力场不同阶段产生的天然裂缝的特征。作为中国主要的煤层气生产和采煤层,研究了Qui水盆地南部沁南东段3号煤层的天然裂缝特征。结果表明,沁南东区及附近地区3#煤层宏观宏观裂缝发育良好。重要的是,裂缝规模,密度,填充物和连通性显示出在不同地质年代发育的裂缝之间的明显差异。结果表明,研究区燕山期形成了三组外生裂缝,分别为NE10-19度,NE60-79度和NE40-49度。同时,在同一时期内形成了三组与外生裂缝正交的内生裂缝。它们分别以NW60-7度,NW10-29度和NW40-49度定向。这三组外生和内生裂缝可能与燕山期构造运动的三个主要事件有关。此外,在研究区域的喜马拉雅时期还形成了三组外源性裂缝,分别位于NW60-79度,NWO-29度和NW40-49度。同时,从喜马拉雅期形成了三组相应的内源性裂缝,分别为NE10-19度,NE60-79度和NE40-49度。这三组外源性和内源性骨折也对应于喜马拉雅时期的三个主要事件。在此期间形成的主要宏观裂缝发生在第二个时期,是喜马拉雅时期最强烈的构造运动。受构造运动的多个阶段影响,宏观自然裂缝在研究区域内走向复杂,走向多方向。这项研究的结果对于了解东秦南区块煤层气的生产行为具有重要意义。 (C)2016 Elsevier B.V.保留所有权利。

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