基于构造活动对准南煤田煤层气富集成藏控制的影响分析  

Influence of tectonic activities on CBM enrichment and accumulation in Junnan Coalfield

作　　者：来鹏 王虎 王一兵 李文杰 邢冬勇 杜世涛 张国起 LAI Peng;WANG Hu;WANG Yibing;LI Wenjie;XING Dongyong;DU Shitao;ZHANG Guoqi(Xinjiang Yaxin Coalbed Methane Resources Technology Research Co.,Ltd.,Urumqi 830000,China;Xinjiang Yaxin Coalbed Methane Investment and Development(Group)Co.,Ltd.,Urumqi 830000,China;Xinjiang Yaxin Coalbed Methane 156 Exploration Co.,Ltd.,Urumqi 830000,China;161st Coal Field Geological Survey Team,Xinjiang Coal Geology Bureau,Urumqi 830046,China)

机构地区：[1]新疆亚新煤层气资源技术研究有限责任公司,乌鲁木齐830000 [2]新疆亚新煤层气投资开发(集团)有限责任公司,乌鲁木齐830000 [3]新疆亚新煤层气一五六勘查有限责任公司,乌鲁木齐830000 [4]新疆维吾尔自治区煤田地质局一六一煤田地质勘探队,乌鲁木齐830046

出　　处：《非常规油气》2024年第5期37-43,共7页Unconventional Oil & Gas

基　　金：2023自治区重大科技专项“准噶尔盆地南缘深部煤层气‘地质工程一体化’高效增产关键技术研发及先导实验”(2023A01004)。

摘　　要：为了查明准南煤田构造活动和构造类型对煤层气富集成藏的控制规律,针对成煤期以来的构造活动及构造类型进行了刻画和梳理,结果表明:构造活动对煤层气藏具有改造、含气量控制及气藏成因类型调整3大作用。结合准南煤层气勘探开发地质认识和高/低含气区构造划分,建立煤层气富集成藏与构造活动和构造类型之间的关系,认为对准南煤层气控制成藏作用的构造运动主要为燕山和喜马拉雅构造运动,具有破坏和重塑的双重效应。构造类型分为褶皱和断裂,其中褶皱构造中向斜构造两翼、轴部及中和面以压应力为主,为高压区,有利于煤层气富集;向斜中和面以下和背斜中和面上部为拉张应力,裂隙较为开放,不利于煤层气成藏。断裂分为张性和压性,张性断裂在煤层气顶板封盖层产生裂隙,不利于煤层气的封存,但有可能作为煤层气运移再成藏的通道;压性断裂是储层圈闭形成的要素,利于煤层气的封存。对构造控制的精准认识,为准南煤田煤层气的评价、选区和工程布置提供依据。In order to find out the control rules of tectonic activities and types on coalbed methane(CBM)enrichment and accumulation in the Junnan Coalfield,the tectonic activities and types since the coal-forming period were described and sorted out.The results showed that tectonic activities have three major effects on CBM reservoirs:transformation,gas content control and gas reservoir genetic type adjustment.Based on the geological understanding of CBM exploration and development and the tectonic division of high/low gas-bearing areas in south China,the relationships between c CBM enrichment and accumulation,tectonic activities,and tectonic types were established.It is concluded that the tectonic activities controlling the CBM accumulation in south China are mainly Yanshan and Himalayan tectonic activities,which have both destructive and reshaping effects.The tectonic types are divided into folds and faults,in which two wings,the axis and middle plane of synclinal folds are dominated by the compressive stress,which are high-pressure area and conducive to CBM enrichment.Parts below the axis and middle planes of synclinal folds and upper parts of the anticlinal folds are dominated by the tension stress and fractures are more open,which are not conducive to CBM accumulation.The faults are divided into tensile and compressive ones.The tensile faults produce fractures in the cap formation of CBM reservoir,which is not conducive to CBM storage but may be used as a channel for CBM migration and accumulation.Compressive faults are the key factor of the reservoir trap,which is conducive to CBM storage.An accurate understanding of tectonic control provides a basis for the evaluation,selection,and engineering layout of CBM in Junnan Coalfield.

关 键 词：准南煤田 煤层气 构造活动 构造类型 富集成藏 

分 类 号：TE121.1[石油与天然气工程—油气勘探]