Formation mechanism of tight sandstone gas in areas of low hydrocarbon generation intensity: A case study of the Upper Paleozoic in north Tianhuan depression in Ordos Basin, NW China
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摘要
The Upper Paleozoic in the north part of Tianhuan depression in the Ordos Basin,NW China has lower hydrocarbon generation intensity and complex gas-water relationship,the main factors controlling the formation of tight sandstone gas and the distribution of tight sandstone gas in the low hydrocarbon generation intensity area are studied.Through two-dimensional physical simulation experiment of hydrocarbon accumulation,analysis of reservoir micro-pore-throat hydrocarbon system and dissection of typical gas reservoirs,the evaluation models of gas injection pressure,reservoir physical property,and gas generation threshold were established to determine the features of tight gas reservoirs in low hydrocarbon intensity area:(1)at the burial depth of less than 3 000 m,the hydrocarbon generation intensity ofis high enough to maintain effective charging;(2)tight sandstone in large scale occurrence is conducive to accumulation of tight gas;(3)differences in reservoir physical property control the distribution of gas pool,for the channel sandstone reservoirs,ones with better physical properties generally concentrate in the middle of sandstone zone and local structural highs;ones with poor physical properties have low gas content generally.Based on the dissection of the gas reservoir in the north Tianhuan depression,the formation of tight gas reservoirs in low hydrocarbon generating intensity area are characterized by"long term continuous charging under hydrocarbon generation pressure,gas accumulation in large scale tight sandstone,pool control by difference in reservoir physical property,and local sweet spot",and the tight gas pools are distributed in discontinuous"sheets"on the plane.This understanding has been proved by expanding exploration of tight sandstone gas in the north Tianhuan depression.
The Upper Paleozoic in the north part of Tianhuan depression in the Ordos Basin,NW China has lower hydrocarbon generation intensity and complex gas-water relationship,the main factors controlling the formation of tight sandstone gas and the distribution of tight sandstone gas in the low hydrocarbon generation intensity area are studied.Through two-dimensional physical simulation experiment of hydrocarbon accumulation,analysis of reservoir micro-pore-throat hydrocarbon system and dissection of typical gas reservoirs,the evaluation models of gas injection pressure,reservoir physical property,and gas generation threshold were established to determine the features of tight gas reservoirs in low hydrocarbon intensity area:(1)at the burial depth of less than 3 000 m,the hydrocarbon generation intensity ofis high enough to maintain effective charging;(2)tight sandstone in large scale occurrence is conducive to accumulation of tight gas;(3)differences in reservoir physical property control the distribution of gas pool,for the channel sandstone reservoirs,ones with better physical properties generally concentrate in the middle of sandstone zone and local structural highs;ones with poor physical properties have low gas content generally.Based on the dissection of the gas reservoir in the north Tianhuan depression,the formation of tight gas reservoirs in low hydrocarbon generating intensity area are characterized by"long term continuous charging under hydrocarbon generation pressure,gas accumulation in large scale tight sandstone,pool control by difference in reservoir physical property,and local sweet spot",and the tight gas pools are distributed in discontinuous"sheets"on the plane.This understanding has been proved by expanding exploration of tight sandstone gas in the north Tianhuan depression.
The Upper Paleozoic in the north part of Tianhuan depression in the Ordos Basin,NW China has lower hydrocarbon generation intensity and complex gas-water relationship,the main factors controlling the formation of tight sandstone gas and the distribution of tight sandstone gas in the low hydrocarbon generation intensity area are studied.Through two-dimensional physical simulation experiment of hydrocarbon accumulation,analysis of reservoir micro-pore-throat hydrocarbon system and dissection of typical gas reservoirs,the evaluation models of gas injection pressure,reservoir physical property,and gas generation threshold were established to determine the features of tight gas reservoirs in low hydrocarbon intensity area:(1)at the burial depth of less than 3 000 m,the hydrocarbon generation intensity ofis high enough to maintain effective charging;(2)tight sandstone in large scale occurrence is conducive to accumulation of tight gas;(3)differences in reservoir physical property control the distribution of gas pool,for the channel sandstone reservoirs,ones with better physical properties generally concentrate in the middle of sandstone zone and local structural highs;ones with poor physical properties have low gas content generally.Based on the dissection of the gas reservoir in the north Tianhuan depression,the formation of tight gas reservoirs in low hydrocarbon generating intensity area are characterized by"long term continuous charging under hydrocarbon generation pressure,gas accumulation in large scale tight sandstone,pool control by difference in reservoir physical property,and local sweet spot",and the tight gas pools are distributed in discontinuous"sheets"on the plane.This understanding has been proved by expanding exploration of tight sandstone gas in the north Tianhuan depression.
引文
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[13]LI Ang,DING Wenlong,HE Jianhua.Research on the types and characteristics of the tight sandstone gas reservoir forming mechanism.Jilin Geology,2014,33(2):8-11.
[14]FAN Yang,ZHA Ming,JIANG Lin,et al.Charging mechanism of tight sandstone gas reservoir and its pattern of accumulation and enrichment.Fault-Block Oil&Gas Field,2014,21(1):1-6.
[15]LI Jian,WEI Guoqi,XIE Zengye.Accumulatian mechanism and main controlling factors of large tight sandstone gas fields in China:Cases study on Ordos Basin and Sichuan Basin.Acta Petrolei Sinica,2013,34(S1):14-24.
[16]WEI Guoqi,ZHANG Fudong,LI Jun,et al.New progress of tight sand gas accumulation theory and favorable exploration zones in China.Natural Gas Geoscience,2016,27(2):199-210.
[17]DAI Jinxing,WANG Tingbin,SONG Yan,et al.Formation conditions and distribution laws of large and medium gas fields in China.Beijing:Geological Publishing House,1997:184-197.
[18]DAI Jinxing,SONG Yan,ZHANG Houfu.Formation conditions of large gas fields in China.SCIENCE CHINA Earth Sciences,1997,40(1):1-10.
[19]DAI Jinxing,ZOU Caineng,TAO Shizhen.Formation conditions and main controlling factors of large gas fields in China.Natural Gas Geoscience,2007,18(4):473-484.
[20]FU Guang,LYU Yanfang,YU Dan.Gas accumulation efficiency and its main controlling factors in China’s large and medium gas fields.Oil&Gas Geology,2005,26(6):754-756.
[21]CHEN Zhanjun,REN Zhanli,WAN Danfu,et al.A calculation method for the charging dynamics of Upper Paleozoic gas reservoirs in the Sulige Gas Field,Ordos Basin.Natural Gas Industry,2016,36(5):38-44.
[22]ZHANG Wenzhong,GUO Yanru,TANG Dazhen,et al.Characteristics of fluid inclusions and determination of gas accumulation period in the Upper Paleozoic reservoirs of Sulige Gas Field.Acta Petrolei Sinica,2009,30(5):685-691.
[23]JIANG F J,PANG X Q,GUO F T,et al.Critical conditions for natural gas charging and delineation of effective gas source rocks for tight sandstone reservoirs.Geological Journal,2016,51(1):113-124.
[24]ZHU Houqin,PANG Xiongqi,JIANG Zhenxue,et al.Studying methods and application of the hydrocarbon accumulation coefficient.Earth Science-Journal of China University of Geosciences,2007,32(2):260-266.
[25]SONG Guoqi.Study and application of the coefficient of hydrocarbon accumulation determined by multifactors.Petroleum Geology&Experiment,2002,24(2):167-171.
[26]LI Jun,WU Xiaodong,YANG Baisong,et al.New understandings of natural gas accumulation and distribution with prediction of favorable exploration plays in China.Xinjiang Petroleum Geology,2014,35(2):137-143.
[27]LI Xianqing,FENG Songbao,LI Jian,et al.Geochemistry of natural gas accumulation in Sulige large gas field in Ordos Basin.Acta Petrologica Sinica,2012,28(3):836-846.
[28]PAN Shuxin,WEI Pingsheng,YUAN Jianying,et al.Expressway of hydrocarbon migration and the thought to find the reservoirs beyond the region of source rock.Acta Sedimentologica Sinica,2011,29(3):600-604.
[2]KUUSKRAA V A,HOAK T E,KUUSKRAA J A,et al.Tight sands gain as U.S.gas source.Oil&Gas Journal,1996,94(12):102-107.
[3]LAW B E,SPENCER C W.Gas in tight reservoirs:An emerging major source of energy.In:HOWELL D G.The future of energy gasses.Reston,Virginia:USGS,1993:204-219.
[4]GONG Yanjie,ZOU Caineng,YUAN Xuanjun,et al.Progress in the research of“continuous”petroleum accumulations abroad.Lithologic Reservoirs,2009,21(4):130-134.
[5]STEPHEN A H.Tight gas sands.SPE Journal,2006,58(6):86-93.
[6]JIN Zhijun,ZHANG Jinchuan.Exploration strategy for deep basin gas reservoirs.Petroleum Exploration and Development,1999,26(1):1-5.
[7]ZHANG Jinchuan,JIN Zhijun,PANG Xiongqi.Formation conditions and internal features of deep basin gas accumulations.Experimental Petroleum Geology,2000,22(3):210-214.
[8]ZHANG Jinchuan.Source-contacting gas:Derived from deep basin gas or basin-centered gas.Natural Gas Industry,2006,26(2):46-48.
[9]ZOU Caineng,TAO Shizhen,ZHU Rukai,et al.Formation and distribution of“continuous”gas reservoirs and their giant gas province:A case from the Upper Triassic Xujiahe Formation giant gas province,Sichuan Basin.Petroleum Exploration and Development,2009,36(3):307-319.
[10]KANG Yili,LUO Pingya.Current status and prospect of key techniques for exploration and production of tight sandstone gas reservoirs in China.Petroleum Exploration and Development,2007,34(2):239-245.
[11]YANG Jian,KANG Yili,SANG Yu,et al.Research on diffusibity of the gas in tight sand gas reservoir.Journal of Southwest Petroleum University(Science&Technology Edition),2009,31(6):76-79.
[12]ZHANG Shuichang,MI Jingkui,LIU Liuhong,et al.Geological features and formation of coal-formed tight sandstone gas pools in China:Cases from Upper Paleozoic gas pools,Ordos Basin and Xujiahe Formation gas pools,Sichuan Basin.Petroleum Exploration and Development,2009,36(3):320-330.
[13]LI Ang,DING Wenlong,HE Jianhua.Research on the types and characteristics of the tight sandstone gas reservoir forming mechanism.Jilin Geology,2014,33(2):8-11.
[14]FAN Yang,ZHA Ming,JIANG Lin,et al.Charging mechanism of tight sandstone gas reservoir and its pattern of accumulation and enrichment.Fault-Block Oil&Gas Field,2014,21(1):1-6.
[15]LI Jian,WEI Guoqi,XIE Zengye.Accumulatian mechanism and main controlling factors of large tight sandstone gas fields in China:Cases study on Ordos Basin and Sichuan Basin.Acta Petrolei Sinica,2013,34(S1):14-24.
[16]WEI Guoqi,ZHANG Fudong,LI Jun,et al.New progress of tight sand gas accumulation theory and favorable exploration zones in China.Natural Gas Geoscience,2016,27(2):199-210.
[17]DAI Jinxing,WANG Tingbin,SONG Yan,et al.Formation conditions and distribution laws of large and medium gas fields in China.Beijing:Geological Publishing House,1997:184-197.
[18]DAI Jinxing,SONG Yan,ZHANG Houfu.Formation conditions of large gas fields in China.SCIENCE CHINA Earth Sciences,1997,40(1):1-10.
[19]DAI Jinxing,ZOU Caineng,TAO Shizhen.Formation conditions and main controlling factors of large gas fields in China.Natural Gas Geoscience,2007,18(4):473-484.
[20]FU Guang,LYU Yanfang,YU Dan.Gas accumulation efficiency and its main controlling factors in China’s large and medium gas fields.Oil&Gas Geology,2005,26(6):754-756.
[21]CHEN Zhanjun,REN Zhanli,WAN Danfu,et al.A calculation method for the charging dynamics of Upper Paleozoic gas reservoirs in the Sulige Gas Field,Ordos Basin.Natural Gas Industry,2016,36(5):38-44.
[22]ZHANG Wenzhong,GUO Yanru,TANG Dazhen,et al.Characteristics of fluid inclusions and determination of gas accumulation period in the Upper Paleozoic reservoirs of Sulige Gas Field.Acta Petrolei Sinica,2009,30(5):685-691.
[23]JIANG F J,PANG X Q,GUO F T,et al.Critical conditions for natural gas charging and delineation of effective gas source rocks for tight sandstone reservoirs.Geological Journal,2016,51(1):113-124.
[24]ZHU Houqin,PANG Xiongqi,JIANG Zhenxue,et al.Studying methods and application of the hydrocarbon accumulation coefficient.Earth Science-Journal of China University of Geosciences,2007,32(2):260-266.
[25]SONG Guoqi.Study and application of the coefficient of hydrocarbon accumulation determined by multifactors.Petroleum Geology&Experiment,2002,24(2):167-171.
[26]LI Jun,WU Xiaodong,YANG Baisong,et al.New understandings of natural gas accumulation and distribution with prediction of favorable exploration plays in China.Xinjiang Petroleum Geology,2014,35(2):137-143.
[27]LI Xianqing,FENG Songbao,LI Jian,et al.Geochemistry of natural gas accumulation in Sulige large gas field in Ordos Basin.Acta Petrologica Sinica,2012,28(3):836-846.
[28]PAN Shuxin,WEI Pingsheng,YUAN Jianying,et al.Expressway of hydrocarbon migration and the thought to find the reservoirs beyond the region of source rock.Acta Sedimentologica Sinica,2011,29(3):600-604.
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