鄂尔多斯盆地东南缘延川南深层煤层气富集高产模式探讨
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摘要
鄂东南延川南区块以上二叠统山西组2号煤层作为主力煤层建成并投入商业开发的深层煤层气田,产气效果好于预期,显示了该区深层煤层气具有较好的勘探开发潜力。通过系统分析区内主力煤层构造特征、煤储层特征及煤层气富集高产控制作用,结合气田动态生产数据,认为延川南深层煤层气为含气量-渗透率耦合控制的富集高产模式,其中埋深小于1 000 m的原生裂隙发育区为自生自储型富集高产模式,埋深大于1 000 m的次生裂隙发育区为内生外储型富集高产模式,并建立了该区深层煤层气富集高产选区评价指标体系,优选出4个富集高产有利区,为气田精细排采和上产稳产提供支持,并为其他深层煤层气区块勘探开发提供借鉴。
The production effect of the deep coalbed gas field in Yanchuannan area at Southeastern Ordos is better than expected,in which the No.2 coal seam of the upper Permain Shanxi formation as the main coal seam is built and commercially produced,revealing that the deep coalbed methane has a great exploration and development potential.Through the systematic analysis of structural features,reservoir characteristics and controlling effects on the CBM enrichment and high-yield of the main coal seam,combined with the dynamic production data of the gas field,it is considered that the model of deep CBM enrichment and high-yield in Yanchuannan area is gas content-permeability coupling control,of which in the primary fissure development zone with buried depth less than 1 000 m,it is self-generated plus self-storage type,while in the secondary fissure development zone with buried depth greater than 1 000 m,it is endogenous generated plus exogenetic-storage type.Upon this basis,the index system of deep CBM evaluation and selection is established,then four favorable areas of gas enrichment and high-yield are optimized,which support for the fine drainage and stable production of the gas field,also provide reference for the exploration and development of other deep CBM areas.
The production effect of the deep coalbed gas field in Yanchuannan area at Southeastern Ordos is better than expected,in which the No.2 coal seam of the upper Permain Shanxi formation as the main coal seam is built and commercially produced,revealing that the deep coalbed methane has a great exploration and development potential.Through the systematic analysis of structural features,reservoir characteristics and controlling effects on the CBM enrichment and high-yield of the main coal seam,combined with the dynamic production data of the gas field,it is considered that the model of deep CBM enrichment and high-yield in Yanchuannan area is gas content-permeability coupling control,of which in the primary fissure development zone with buried depth less than 1 000 m,it is self-generated plus self-storage type,while in the secondary fissure development zone with buried depth greater than 1 000 m,it is endogenous generated plus exogenetic-storage type.Upon this basis,the index system of deep CBM evaluation and selection is established,then four favorable areas of gas enrichment and high-yield are optimized,which support for the fine drainage and stable production of the gas field,also provide reference for the exploration and development of other deep CBM areas.
引文
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[16]陈刚,胡宗全,苏坤,等.鄂东南延川南深煤层煤体结构与产气量关系分析[J].煤炭科学技术,2016,44(12):107-112.CHEN Gang,HU Zongquan,SU Kun,et al.Analysis between deep coalbed texture and well production in the case of Yanchuannan block in southeast of Ordos basin[J].Coal Science and Technology,2016,44(12):107-112.
[17]陈刚,胡宗全,张永贵,等.延川南区块煤层气富集高产的地质控制作用[J].天然气地球科学,2016,27(11):2093-2102.CHEN Gang,HU Zongquan,ZHANG Yonggui,et al.Study on the geological of gas effect of coalbed methane enrichment and high-yield in Yanchuannan Area[J].Natural Gas Geoscience,2016,27(11):2093-2102.
[18]孙平.煤层气成藏条件与成藏过程分析[D].成都:成都理工大学,2007.SUN Pin.Analysis on formation conditions and process of coalbed methane reservoir[D].Chengdu:Chengdu University of Technology,2007.
[19]陈刚,秦勇,胡宗全,等.准噶尔盆地白家海凸起深层含煤层气系统成藏组合特征[J].煤炭学报,2016,41(1):80-86.CHEN Gang,QIN Yong,HU Zongquan,et al.Characteristic of reservoiring assemblage of deep CBM-bearing system in Baijiahai dome of Junggar basin[J].Journal of China Coal Society,2016,41(1):80-86.
[2]王立志,刘常青,邓玉胜,等.延川南区块山西组2号煤层气富集高产地质规律研究[J].中国煤层气,2014,12(6):16-19.WANG Lizhi,LIU Changqing,DENG Yusheng,et al.Study on geological regulations of coalbed methane enrichment and fine performance for No.2 coal seam in Shanxi formation of Yanchuannan block[J].China Coalbed Methane,2014,12(6):16-19.
[3]陈刚.秦勇,李五忠,等.鄂尔多斯盆地东部深层煤层气成藏地质条件分析[J].高校地质学报,2012,18(3):465-473.CHEN Gang,QIN Yong,LI Wuzhong,et al.Analysis of geological conditions of deep coalbed methane reservoiring in the Eastern Ordos Basin[J].Geological Journal of China Universities,2012,18(3):465-473.
[4]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.
[5]马伟竣.鄂尔多斯盆地延川南2号煤层煤相分析[J].中国煤层气,2014,11(2):25-29.MA Weijun.Analysis of coal facies of No.2 coal seam in Yanchuannan block of Ordos Basin[J].China Coalbed Methane,2014,11(2):25-29.
[6]陈刚,李五忠.鄂尔多斯盆地深部煤层气吸附能力的影响因素及规律[J].天然气工业,2011,31(10):47-49.CHEN Gang,LI Wuzhong.Influencing factors and patterns of CBM adsorption capacity in the deep Ordos Basin[J].Natural Gas Industry,2011,31(10):47-49.
[7]李五忠,陈刚,孙斌,等.大宁-吉县地区煤层气成藏条件及富集规律[J].天然气地球科学,2011,22(2):352-360.LI Wuzhong,CHEN Gang,SUN Bin,et al.Geological controls of coalbed methane enrichment in Daning-Jixian area,Southeastern Ordos basin[J].Natural Gas Geoscience,2011,22(2):352-360.
[8]陈刚,秦勇,胡宗全,等.不同煤阶深煤层含气量差异及其变化规律[J].高校地质学报,2015,21(2):274-279.CHEN Gang,QIN Yong,HU Zongquan,et al.Differences and variable regularity of deep coalbed gas content of different coal rank[J].Geological Journal of China Universities,2015,21(2):274-279.
[9]秦勇,申建,沈玉林.叠置含气系统共采兼容性——煤系“三气”及深部煤层气开采中的共性地质问题[J].煤炭学报,2016,41(1):14-23.QIN Yong,SHEN Jian,SHEN Yulin.Joint mining compatibility of superposed gas-bearing systems:A general geological problem for extraction of three natural gases and deep CBM in coal series[J].Journal of China Coal Society,2016,41(1):14-23.
[10]申建,秦勇,傅雪海,等.深部煤层气成藏条件特殊性及其临界深度探讨[J].天然气地球科学,2014,25(9):1470-1476.SHEN Jian,QIN Yong,FU Xuehai,et al.Properties of deep coalbed methane reservoir-forming conditions and critical depth discussion[J].Natural Gas Geoscience,2014,25(9):1470-1476.
[11]陈刚,秦勇,杨青,等.不同煤阶煤储层应力敏感性差异及其对煤层气产出的影响[J].煤炭学报,2014,39(3):504-509.CHEN Gang,QIN Yong,YANG Qing,et al.Different stress sensitivity of different coal rank reservoir permeability and its effect on the coalbed methane output[J].Journal of China Coal Society,2014,39(3):504-509.
[12]宋全友.深部煤层气成藏条件及开发潜势研究[D].徐州:中国矿业大学,2003.SONG Quanyou.Reservoiring conditions and development potential of deep CBM[D].Xuzhou:China University of Mining&Technology,2003.
[13]李剑,王勃,邵龙义,等.水文地质分区及其控气作用——以鄂东气田保德区块为例[J].中国矿业大学学报,2017,46(4):869-876.LI Jian,WANG Bo,SHAO Longyi,et al.Hydrogeological zoning and its gas-controlling mechanism:A case study of Baode Block,eastern Ordos gas field[J].Journal of China University of Mining&Technology,2017,46(4):869-876.
[14]王立志,刘常青,邓玉胜,等.延川南区块山西组2号煤层气富集高产地质规律研究[J].中国煤层气,2014,12(6):16-19.WANG Lizhi,LIU Changqing,DENG Yusheng,et al.Study on geological regulations of coalbed methane enrichment and fine performance for No.2 coal seam in Shanxi formation of Yanchuannan Block[J].China Coalbed Methane,2014,12(6):16-19.
[15]李清.山西延川南煤层气田2号煤层煤相研究-煤层气开发选区意义[J].石油实验地质,2014,36(2):245-248.LI Qing.Coal facies of No.2 coal in Yanchuannan coal field of Shanxi:Significance for constituencies of coalbed methane exploitation[J].Petroleum Geology&Experiment,2014,36(2):245-248.
[16]陈刚,胡宗全,苏坤,等.鄂东南延川南深煤层煤体结构与产气量关系分析[J].煤炭科学技术,2016,44(12):107-112.CHEN Gang,HU Zongquan,SU Kun,et al.Analysis between deep coalbed texture and well production in the case of Yanchuannan block in southeast of Ordos basin[J].Coal Science and Technology,2016,44(12):107-112.
[17]陈刚,胡宗全,张永贵,等.延川南区块煤层气富集高产的地质控制作用[J].天然气地球科学,2016,27(11):2093-2102.CHEN Gang,HU Zongquan,ZHANG Yonggui,et al.Study on the geological of gas effect of coalbed methane enrichment and high-yield in Yanchuannan Area[J].Natural Gas Geoscience,2016,27(11):2093-2102.
[18]孙平.煤层气成藏条件与成藏过程分析[D].成都:成都理工大学,2007.SUN Pin.Analysis on formation conditions and process of coalbed methane reservoir[D].Chengdu:Chengdu University of Technology,2007.
[19]陈刚,秦勇,胡宗全,等.准噶尔盆地白家海凸起深层含煤层气系统成藏组合特征[J].煤炭学报,2016,41(1):80-86.CHEN Gang,QIN Yong,HU Zongquan,et al.Characteristic of reservoiring assemblage of deep CBM-bearing system in Baijiahai dome of Junggar basin[J].Journal of China Coal Society,2016,41(1):80-86.