木里煤田侏罗系煤系非常规气共存规律研究
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摘要
为探索木里煤田煤系气赋存特征,通过含气性、烃源岩有机地化以及储集层物性特征的分析测试,认为煤系气含气量变化较大,以木里组上段含气量最高;总有机碳含量和生烃潜率评价均显示此组煤系烃源岩为优质烃源岩,其中煤为Ⅲ型干酪根,而油页岩、泥岩为Ⅱ2型干酪根,Ro分布在0.74%~1.85%,处于成熟-高成熟度的有利生气阶段;煤储层孔隙度为2.7%~13.7%,渗透率为(0.03~10.6)×10-3μm~2,而页岩及致密砂岩储层孔隙度普遍不高于4.5%,渗透率普遍低于0.1×10~(-3)μm~2。结合典型钻孔分析建立了木里煤田内的3种煤系非常规气共存组合模式。在总结了木里煤田的煤系非常规气的成藏特征基础上,综合分析认为中侏罗统木里组上段以及江仓组是煤系非常规气勘探的重点层段,并进一步提出了勘探开发建议。
In order to explore the coal measures gas deposition features of Muri Coalfield,with the analysis and test on the gas content,organic geochemistry of the hydrocarbon source rock and the reservoir physical properties,the paper held that there was a big variation in the gas content of the coal measures gas and the gas content at the top section in Muri Formation was highest. The total organic carbon content and hydrocarbon potential evaluation showed that the hydrocarbon source rock of the coal measures in the block was excellent quality hydrocarbon source rock. Among them,the coal would be a Ⅲ type kerogen and the oil shale and mudstone would be Ⅱ2type keroge. The Rodistribution would be 0.74% ~ 1.85% and would be in a maturing to high mature favorable gas production stage. The porosity of the coal reservoir was ranged from 2.7% ~ 13.7%,the permeability was ranged between( 0.03 ~ 10.6) × 10-3μm2,the porosity of the shale and tight sandstone reservoir would not be over 4.5% generally and the permeability would be lower than 0.1×10-3μm2generally. In combination with the analysis on the typical boreholes,there were three coal measures unconventional gas coexisted combined models established within the block. Based on the summarization on the formation features of the coal measures unconventional gas in Muli Coalfield,the comprehensive analysis showed that the upper section of Muli Formation,Middle Jurassic and Jiangcang Formation would be the key floor section of the unconventional gas exploration. A proposal on the further exploration and development of the gas was provided.
In order to explore the coal measures gas deposition features of Muri Coalfield,with the analysis and test on the gas content,organic geochemistry of the hydrocarbon source rock and the reservoir physical properties,the paper held that there was a big variation in the gas content of the coal measures gas and the gas content at the top section in Muri Formation was highest. The total organic carbon content and hydrocarbon potential evaluation showed that the hydrocarbon source rock of the coal measures in the block was excellent quality hydrocarbon source rock. Among them,the coal would be a Ⅲ type kerogen and the oil shale and mudstone would be Ⅱ2type keroge. The Rodistribution would be 0.74% ~ 1.85% and would be in a maturing to high mature favorable gas production stage. The porosity of the coal reservoir was ranged from 2.7% ~ 13.7%,the permeability was ranged between( 0.03 ~ 10.6) × 10-3μm2,the porosity of the shale and tight sandstone reservoir would not be over 4.5% generally and the permeability would be lower than 0.1×10-3μm2generally. In combination with the analysis on the typical boreholes,there were three coal measures unconventional gas coexisted combined models established within the block. Based on the summarization on the formation features of the coal measures unconventional gas in Muli Coalfield,the comprehensive analysis showed that the upper section of Muli Formation,Middle Jurassic and Jiangcang Formation would be the key floor section of the unconventional gas exploration. A proposal on the further exploration and development of the gas was provided.
引文
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[12]李靖.青海省两大赋煤区煤系非常规气形成条件及对比研究[D].北京:中国矿业大学(北京),2013.
[13]曹代勇,王崇敬,李靖,等.煤系页岩气的基本特点与聚集规律[J].煤田地质与勘探,2014,42(4):25-30.Cao Daiyong,Wang Chongjing,Li Jing,et al.Basic characteristics and accumulation rules of shale gas in coal measures[J].Coal Geology&Exploration,2014,42(4):25-30.
[14]曹代勇,王丹,李靖,等.青海祁连山冻土区木里煤田天然气水合物气源分析[J].煤炭学报,2012,37(8):1364-1368.Cao Daiyong,Wang Dan,Li Jing,et al.Gas source analysis of natural gas hydrate of Muri coalfield in Qilian Mountain permafrost,Qinghai Province,China[J].Journal of China Coal Society,2012,37(8):1364-1368.
[15]李靖,曹代勇,豆旭谦,等.木里地区天然气水合物成藏模式[J].辽宁工程技术大学学报:自然科学版,2012,31(4):484-488.Li Jing,Cao Daiyong,Dou Xuqian,et al.Accumulation model of natural gas hydrate in Muli area[J].Journal of Liaoning Technical University:Natural Science Edition,2012,31(4):484-488.
[16]曹代勇,刘天绩,王丹,等.青海木里地区天然气水合物形成条件分析[J].中国煤炭地质,2009,21(9):3-6.Cao Daiyong,Liu Tianji,Wang Dan,et al.Analysis of formation conditions of natural gas hydrate in Muli Coalfield,Qinghai Province[J].Coal Geology of China,2009,21(9):3-6.
[17]Cao Daiyong,Wang Dan,Wang Tong,et al.Formation conditions and resource prospect of natural gas hydrate in Muri coalfield,Qinghai province,China[C]//2010 Conference on Energy Strategy and Technology London:Science Publising Limited,2010.
[18]郭秋麟,李建忠,陈宁生,等.四川合川—潼南地区须家河组致密砂岩气成藏模拟[J].石油勘探与开发,2011,38(4):409-417.Guo Qiulin,Li Jianzhong,Chen Ningsheng,et al.Modeling of the tight sandstone gas accumulation for the Xujiahe formation,Hechuan-Tongnan Area,Sichuan Basin[J].Petroleum Exploration and Development,2011,38(4):409-417.
[19]Bohacs K M,Suter J R.Sequence stratigraphic distribution of coaly rocks:fundamental controls and paralic examples[J].Aapg Bulletin,1997,81(10):1612-1639.
[20]赵靖舟,付金华,姚泾利,等.鄂尔多斯盆地准连续型致密砂岩大气田成藏模式[J].石油学报,2012,32(S1):37-52.Zhao Jingzhou,Fu Jinhua,Yao Jingli,et al.Quasi-continuous accumulation model of large tight sandstone gas field in Ordos Basin[J].Acta Petrolei Sinica,2012,32(S1):37-52.
[2]王佟,王庆伟,傅雪海.煤系非常规天然气的系统研究及其意义[J].煤田地质与勘探,2014,42(1):24-27.Wang Tong,Wang Qingwei,Fu Xuehai.The significance and the systematic research of the unconventional gas in coal measures[J].Coal Geology&Exploration,2014,42(1):24-27.
[3]孙升林,吴国强,曹代勇,等.煤系矿产资源及其发展趋势[J].中国煤炭地质,2014,26(11):1-11.Sun Shenglin,Wu Guoqiang,Cao Daiyong,et al.Mineral resources in coal measures and development trend[J].Coal Geology of China,2014,26(11):1-11.
[4]任德贻,代世峰.煤和含煤岩系中潜在的共伴生矿产资源:一个值得重视的问题[J].中国煤炭地质,2009,21(10):1-4.Ren Deyi,Dai Shifeng.Potential coexisting and associated mineral resources in coal and coal-bearing strata:an Issue should pay close attention to[J].Coal Geology of China,2009,21(10):1-4.
[5]祝有海,张永勤,文怀军,等.青海祁连山冻土区发现天然气水合物[J].地质学报,2009,83(11):1762-1770.Zhu Youhai,Zhang Yongqin,Wen Huaijun,et al.Gas Hydrate was found in permafrost region Qilian Mountain,Qihai[J].Acta Geologica Sinica,2009,83(11):1762-1770.
[6]郭晋宁,李猛,邵龙义.青海聚乎更矿区煤层气富集条件[J].中国煤炭地质,2011,23(6):18-22,32.Guo Jinning,Li Meng,Shao Longyi.CBM enrichment conditions in Juhugeng Mine Area,Qinghai[J].Coal Geology of China,2011,23(6):18-22,32.
[7]秦荣芳,李靖,王崇敬,等.青海省木里煤田煤系页岩气生烃条件分析[J].黑龙江科技大学学报,2013,23(6):531-534.Qin Rongfang,Li Jing,Wang Chongjing,et al.Analysis of hydrocarbon generation conditions of shale gas in coal series in Muri coalfield,Qinghai Province[J].Journal of Heilongjiang Institute of Science&Technology,2013,23(6):531-534.
[8]曹代勇,孙红波,孙军飞.青海东北部木里煤田控煤构造样式与找煤预测[J].地质通报,2010,29(11):1696-1703.Cao Daiyong,Sun Hongbo,Sun Junfei.Coal-controlled structural styles and looking for coal resources in Muli coalfield,Northeastern Qinghai,China[J].Geological Bulletin of China,2010,29(11):1696-1703.
[9]文怀军,邵龙义,李永红,等.青海省天峻县木里煤田聚乎更矿区构造轮廓和地层格架[J].地质通报,2011,30(12):1823-1828.Wen Huaijun,Shao Longyi,Li Yonghong,et al.Structure and stratigraphy of the Juhugeng coal district at Muli,Tianjun County,Qinghai Province[J].Geological Bulletin of China,2011,30(12):1823-1828.
[10]杨德寿,王青平,童海奎.青海聚乎更矿区侏罗纪含煤岩系沉积相研究[J].中国煤炭地质,2011,23(12):15-17.Yang Deshou,Wang Qingping,Tong Haikui.A Study on Jurassic Coal-bearing Rock Series Sedimentary Facies in Juhugeng Mine Area,Qinghai[J].Coal Geology of China,2011,23(12):15-17.
[11]戴金星,戚厚发,王少昌,等.我国煤系的气油地球化学特征、煤层气藏形成条件及资源评价[M].北京:石油工业出版社,2001.
[12]李靖.青海省两大赋煤区煤系非常规气形成条件及对比研究[D].北京:中国矿业大学(北京),2013.
[13]曹代勇,王崇敬,李靖,等.煤系页岩气的基本特点与聚集规律[J].煤田地质与勘探,2014,42(4):25-30.Cao Daiyong,Wang Chongjing,Li Jing,et al.Basic characteristics and accumulation rules of shale gas in coal measures[J].Coal Geology&Exploration,2014,42(4):25-30.
[14]曹代勇,王丹,李靖,等.青海祁连山冻土区木里煤田天然气水合物气源分析[J].煤炭学报,2012,37(8):1364-1368.Cao Daiyong,Wang Dan,Li Jing,et al.Gas source analysis of natural gas hydrate of Muri coalfield in Qilian Mountain permafrost,Qinghai Province,China[J].Journal of China Coal Society,2012,37(8):1364-1368.
[15]李靖,曹代勇,豆旭谦,等.木里地区天然气水合物成藏模式[J].辽宁工程技术大学学报:自然科学版,2012,31(4):484-488.Li Jing,Cao Daiyong,Dou Xuqian,et al.Accumulation model of natural gas hydrate in Muli area[J].Journal of Liaoning Technical University:Natural Science Edition,2012,31(4):484-488.
[16]曹代勇,刘天绩,王丹,等.青海木里地区天然气水合物形成条件分析[J].中国煤炭地质,2009,21(9):3-6.Cao Daiyong,Liu Tianji,Wang Dan,et al.Analysis of formation conditions of natural gas hydrate in Muli Coalfield,Qinghai Province[J].Coal Geology of China,2009,21(9):3-6.
[17]Cao Daiyong,Wang Dan,Wang Tong,et al.Formation conditions and resource prospect of natural gas hydrate in Muri coalfield,Qinghai province,China[C]//2010 Conference on Energy Strategy and Technology London:Science Publising Limited,2010.
[18]郭秋麟,李建忠,陈宁生,等.四川合川—潼南地区须家河组致密砂岩气成藏模拟[J].石油勘探与开发,2011,38(4):409-417.Guo Qiulin,Li Jianzhong,Chen Ningsheng,et al.Modeling of the tight sandstone gas accumulation for the Xujiahe formation,Hechuan-Tongnan Area,Sichuan Basin[J].Petroleum Exploration and Development,2011,38(4):409-417.
[19]Bohacs K M,Suter J R.Sequence stratigraphic distribution of coaly rocks:fundamental controls and paralic examples[J].Aapg Bulletin,1997,81(10):1612-1639.
[20]赵靖舟,付金华,姚泾利,等.鄂尔多斯盆地准连续型致密砂岩大气田成藏模式[J].石油学报,2012,32(S1):37-52.Zhao Jingzhou,Fu Jinhua,Yao Jingli,et al.Quasi-continuous accumulation model of large tight sandstone gas field in Ordos Basin[J].Acta Petrolei Sinica,2012,32(S1):37-52.