六盘山盆地页岩吸附气赋存条件及其影响因素
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摘要
六盘山盆地具备一定的油气勘探条件。为了探索六盘山盆地页岩吸附气的赋存条件及其影响因素,通过建立吸附气模型等方法对盆地内GY1井白垩系马东山组泥页岩进行了研究。六盘山盆地白垩系泥页岩有机质含量偏低,最大甲烷吸附能力介于1.73～2.35 m~3/t之间,均值为2.03 m~3/t,具有较强的储气能力。泥页岩吸附能力随深度增加呈先增大后减小的趋势,存在一个深度拐点,在浅部压力起主要作用,而在深部温度起主要作用。泥页岩吸附气的赋存条件主要受6个方面的影响,其中有机质丰度、成熟度和湿度的影响并不显著,而矿物含量、微观物性和温度、压力是主要的影响因素。在外界地质条件适合的情况下,六盘山盆地页岩储层中的气体富集程度比较高,非常有利于页岩气的开发。
The Liupanshan Basin has potentially favorable conditions for oil and gas exploration. An absorbed gas model and other methods were used to study the mud shale in the Cretaceous Madongshan Formation in the well GY 1 in the Liupanshan Basin in order to discuss the occurrence and controls of the shale absorbed gas. The Cretaceous shale in the basin has a relatively low content of organic matter, but the maximum methane adsorption capacity ranges from 1.73 to 2.35 m~3/t with a mean value of 2.03 m~3/t indicating a relatively high gas storage capacity. The adsorption capacity of the shale increases first and then decreases with increasing depth. There is a deep inflection point. Pressure plays a major role in shallow formations, while temperature plays a major role at depth. The occurrence conditions of shale absorbed gas were mainly affected by six factors, among which the influence of organic matter abundance, maturity and moisture content were not significant, while mineral content, microscopic properties, temperature and pressure were the main influencing factors. When the external geological conditions are suitable, the gas enrichment degree of the shale reservoir in the Liupanshan Basin could be relatively high and very favorable for exploration.
The Liupanshan Basin has potentially favorable conditions for oil and gas exploration. An absorbed gas model and other methods were used to study the mud shale in the Cretaceous Madongshan Formation in the well GY 1 in the Liupanshan Basin in order to discuss the occurrence and controls of the shale absorbed gas. The Cretaceous shale in the basin has a relatively low content of organic matter, but the maximum methane adsorption capacity ranges from 1.73 to 2.35 m~3/t with a mean value of 2.03 m~3/t indicating a relatively high gas storage capacity. The adsorption capacity of the shale increases first and then decreases with increasing depth. There is a deep inflection point. Pressure plays a major role in shallow formations, while temperature plays a major role at depth. The occurrence conditions of shale absorbed gas were mainly affected by six factors, among which the influence of organic matter abundance, maturity and moisture content were not significant, while mineral content, microscopic properties, temperature and pressure were the main influencing factors. When the external geological conditions are suitable, the gas enrichment degree of the shale reservoir in the Liupanshan Basin could be relatively high and very favorable for exploration.
引文
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[16] 张雪芬,陆现彩,张林晔,等.页岩气的赋存形式研究及其石油地质意义[J].地球科学进展,2010,25(6):597-604. ZHANG Xuefen,LU Xiancai,ZHANG Linye,et al.Occurrences of shale gas and their petroleum geological significance[J].Advances in Earth Science,2010,25(6):597-604.
[17] 蒋裕强,董大忠,漆麟,等.页岩气储层的基本特征及其评价[J].天然气工业,2010,30(10):7-12. JIANG Yuqiang,DONG Dazhong,QI Lin,et al.Basic features and evaluation of shale gas reservoirs[J].Natural Gas Industry,2010,30(10):7-12.
[18] LOUCKS R G,REED R M,RUPPEL S C,et al.Morphology,genesis,and distribution of nanometer-scale pores in siliceous mudstones of the Mississippian Barnett shale[J].Journal of Sedimentary Research,2009,79(12):848-861.
[19] ROSS D J K,BUSTIN R M.The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs[J].Marine and Petroleum Geology,2009,26(6):916-927.
[20] KROOSS B M,VAN BERGEN F,GENSTERBLUM Y,et al.High-pressure methane and carbon dioxide adsorption on dry and moisture-equilibrated Pennsylvanian coals[J].International Journal of Coal Geology,2002,51(2):69-92.
[21] ROSS D J K,BUSTIN R M.Impact of mass balance calculations on adsorption capacities in microporous shale gas reservoirs[J].Fuel,2007,86(17/18):2696-2706. (编辑
[2] CURTIS J B.Fractured shale-gas systems[J].AAPG Bulletin,2002,86(11):1921-1938.
[3] 李新景,胡素云,程克明.北美裂缝性页岩气勘探开发的启示[J].石油勘探与开发,2007,34(4):392-400. LI Xinjing,HU Suyun,CHENG Keming.Suggestions from the development of fractured shale gas in North America[J].Petroleum Exploration and Development,2007,34(4):392-400.
[4] 徐国盛,徐志星,段亮,等.页岩气研究现状及发展趋势[J].成都理工大学学报(自然科学版),2011,38(6):603-610. XU Guosheng,XU Zhixing,DUAN Liang,et al.Status and development tendency of shale gas research[J].Journal of Chengdu University of Technology (Science & Technology Edition),2011,38(6):603-610.
[5] MONTGOMERY S L,JARVIE D M,BOWKER K A,et al.Mississippian Barnett shale,Fort Worth Basin,north-central Texas:gas-shale play with multi-trillion cubic foot potential[J].AAPG Bulletin,2005,89(2):155-175.
[6] JARVIE D M,HILL R J,RUBLE T E,et al.Unconventional shale-gas systems:the Mississippian Barnett shale of north-central Texas as one model for thermogenic shale-gas assessment[J].AAPG Bulletin,2007,91(4):475-499.
[7] 聂海宽,唐玄,边瑞康.页岩气成藏控制因素及中国南方页岩气发育有利区预测[J].石油学报,2009,30(4):484-491. NIE Haikuan.TANG Xuan,BIAN Ruikang.Controlling factors for shale gas accumulation and prediction of potential development area in shale gas reservoir of South China[J].Acta Petrolei Sinica,2009,30(4):484-491.
[8] 杨福忠,胡社荣.六盘山盆地中、新生代构造演化和油气勘探[J].新疆石油地质,2001,22(3):192-195. YANG Fuzhong,HU Sherong.Tectonic evolution and oil-gas exploration during the Mesozoic and Cenozoic in Liupanshan Basin[J].Xinjiang Petroleum Geology,2001,22(3):192-195.
[9] 方帆,孙冲,舒向伟,等.页岩中甲烷等温吸附量计算问题及方法改进[J].石油实验地质,2018,40(1):71-77. FANG Fan,SUN Chong,SHU Xiangwei,et al.Problems of methane isothermal adsorption calculation in shale and method improvement[J].Petroleum Geology & Experiment,2018,40(1):71-77.
[10] 高永利,李腾,关新,等.基于重量法的页岩气高压等温吸附研究[J].石油实验地质,2018,40(4):566-572. GAO Yongli,LI Teng,GUAN Xin,et al.Mass method adsorption characteristics of shale gas under high pressure[J].Petroleum Geology & Experiment,2018,40(4):566-572.
[11] 程超,白小军,林海宇,等.川南龙马溪组深层页岩气储层吸附气含量计算方法研究[J].特种油气藏,2018,25(4):1-6. CHENG Chao,BAI Xiaojun,LIN Haining,et al.Study on the calculation of adsorption gas content of Longmaxi Formation deep shale reservoir in southern Sichuan Basin[J].Special Oil & Gas Reservoirs,2018,25(4):1-6.
[12] 朱汉卿,贾爱林,位云生,等.昭通示范区龙马溪组页岩微观孔隙结构特征及吸附能力[J].油气地质与采收率,2018,25(4):1-6. ZHU Hanqing,JIA Ailin,WEI Yunsheng,et al.Characteristics of microscopic pore structure and methane adsorption capacity of shale in the Longmaxi Formation in the Zhaotong area[J].Petroleum Geology and Recovery Efficiency,2018,25(4):1-6.
[13] AMANKWAH K A G,SCHWARZ J A.A modified approach for estimating pseudo-vapor pressures in the application of the Dubinin-Astakhov equation[J].Carbon,1995,33(9):1313-1319.
[14] BOWKER K A.Barnett shale gas production,Fort Worth Basin:issues and discussion[J].AAPG Bulletin,2007,91(4):523-533.
[15] MARTINI A M,WALTER L M,MCINTOSH J C.Identification of microbial and thermogenic gas components from Upper Devonian black shale cores,Illinois and Michigan basins[J].AAPG Bulletin,2008,92(3):327-339.
[16] 张雪芬,陆现彩,张林晔,等.页岩气的赋存形式研究及其石油地质意义[J].地球科学进展,2010,25(6):597-604. ZHANG Xuefen,LU Xiancai,ZHANG Linye,et al.Occurrences of shale gas and their petroleum geological significance[J].Advances in Earth Science,2010,25(6):597-604.
[17] 蒋裕强,董大忠,漆麟,等.页岩气储层的基本特征及其评价[J].天然气工业,2010,30(10):7-12. JIANG Yuqiang,DONG Dazhong,QI Lin,et al.Basic features and evaluation of shale gas reservoirs[J].Natural Gas Industry,2010,30(10):7-12.
[18] LOUCKS R G,REED R M,RUPPEL S C,et al.Morphology,genesis,and distribution of nanometer-scale pores in siliceous mudstones of the Mississippian Barnett shale[J].Journal of Sedimentary Research,2009,79(12):848-861.
[19] ROSS D J K,BUSTIN R M.The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs[J].Marine and Petroleum Geology,2009,26(6):916-927.
[20] KROOSS B M,VAN BERGEN F,GENSTERBLUM Y,et al.High-pressure methane and carbon dioxide adsorption on dry and moisture-equilibrated Pennsylvanian coals[J].International Journal of Coal Geology,2002,51(2):69-92.
[21] ROSS D J K,BUSTIN R M.Impact of mass balance calculations on adsorption capacities in microporous shale gas reservoirs[J].Fuel,2007,86(17/18):2696-2706. (编辑