鄂尔多斯盆地志丹地区山西组砂岩致密化发育时限探讨
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摘要
借助于显微镜的单偏光和荧光,对鄂尔多斯盆地志丹地区山西组致密砂岩的岩石学特征进行观察,同时,采用显微冷热台对石英次生加大边中的包裹体进行测温,并使用激光拉曼光谱对包裹体的组分进行分析。盆地模拟研究发现,志丹地区山西组致密砂岩石英次生加大边中发育无机盐水包裹体、含烃盐水包裹体、气液态烃包裹体和气态烃包裹体4种类型包裹体;赋存在Ⅰ期石英次生加大边内的盐水包裹体均一温度在80~100℃,冰点温度在-4~-2℃,推测形成时间为200×10~6—190×10~6a;Ⅱ期石英次生加大边的盐水包裹体均一温度在105~125℃,冰点温度在-6~-4℃,包裹体气相组分以CO_2为主,少量C_2H_6,推测第一期天然气充注时间及砂岩初次致密化时间为190×10~6—160×10~6a;Ⅲ期石英次生加大边中的盐水包裹体均一温度在135~155℃,冰点温度在-10~-8℃,包裹体气相组分以CH_4和C_2H_6为主,伴随有大量后期高成熟天然气充注,推测天然气成藏及砂岩进一步致密化的时间为160×10~6—140×10~6a,天然气的充注伴随着砂岩的后期致密化发育。
By means of polarized-light and fluorescence microscopes, petrological characteristics of the tight sandstones of Shanxi forma-tion in Zhidan area, Ordos basin are observed. Meanwhile, temperatures of the inclusion in the quartz overgrowth edges are measured by us-ing microscopic heating-freezing stages and components of the inclusion are analyzed with laser Raman spectroscopy. The study shows thatfour types of inclusions are developed in the quartz overgrowth edges of the tight sandstones in Shanxi formation of Zhidan area, namely, in-organic brine inclusion, hydrocarbon-bearing brine inclusion, gaseous and liquid hydrocarbon inclusion, and gaseous hydrocarbon inclu-sion. The homogenization temperature of the brine inclusion occurred in the quartz overgrowth edges of Stage Ⅰ ranges from 80℃ to 100℃and its freezing temperature is-4~-2℃. Based on which, it is assumed that the quartz overgrowth edge was formed 200×10~6~190×10~6yearsago; brine inclusion in the quartz overgrowth edges of Stage Ⅱ has a homogenization temperature of 105~125℃ and freezing temperatureof-6~-4℃, whose gaseous components are dominated by CO_2 with minor C_2H_6, indicating the time for Stage Ⅰ natural gas charging andinitial sandstone densification was 190×10~6~160×10~6years ago. The homogenization temperature and freezing temperature of the brine in-clusion in the quartz overgrowth edges of Stage Ⅲ are 135~155℃ and-10~-8℃, respectively. The gasceous components are dominated byCH_4 and C_2H_6, accompanied by large amount of high-matured natural gas charging at the late stage. Then it is assumed that the time for nat-ural gas accumulation and further sandstone densification occurred 160×10~6~140×10~6years ago. Natural gas charging was accompanied bylate-stage sandstone densification.
By means of polarized-light and fluorescence microscopes, petrological characteristics of the tight sandstones of Shanxi forma-tion in Zhidan area, Ordos basin are observed. Meanwhile, temperatures of the inclusion in the quartz overgrowth edges are measured by us-ing microscopic heating-freezing stages and components of the inclusion are analyzed with laser Raman spectroscopy. The study shows thatfour types of inclusions are developed in the quartz overgrowth edges of the tight sandstones in Shanxi formation of Zhidan area, namely, in-organic brine inclusion, hydrocarbon-bearing brine inclusion, gaseous and liquid hydrocarbon inclusion, and gaseous hydrocarbon inclu-sion. The homogenization temperature of the brine inclusion occurred in the quartz overgrowth edges of Stage Ⅰ ranges from 80℃ to 100℃and its freezing temperature is-4~-2℃. Based on which, it is assumed that the quartz overgrowth edge was formed 200×10~6~190×10~6yearsago; brine inclusion in the quartz overgrowth edges of Stage Ⅱ has a homogenization temperature of 105~125℃ and freezing temperatureof-6~-4℃, whose gaseous components are dominated by CO_2 with minor C_2H_6, indicating the time for Stage Ⅰ natural gas charging andinitial sandstone densification was 190×10~6~160×10~6years ago. The homogenization temperature and freezing temperature of the brine in-clusion in the quartz overgrowth edges of Stage Ⅲ are 135~155℃ and-10~-8℃, respectively. The gasceous components are dominated byCH_4 and C_2H_6, accompanied by large amount of high-matured natural gas charging at the late stage. Then it is assumed that the time for nat-ural gas accumulation and further sandstone densification occurred 160×10~6~140×10~6years ago. Natural gas charging was accompanied bylate-stage sandstone densification.
引文
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[10]朱华东,罗勤,周理,等.激光拉曼光谱及其在天然气分析中的应用展望[J].天然气工业,2013,33(11):110-114.ZHU Donghua,LUO Qin,ZHOU Li,et al.Application prospect ofnatural gas companent analysis using Laser Raman spectroscopy[J].Natural Gas Industry,2013,33(11):110-114.
[11]李艳霞,闫新义,田毓峰.鄂尔多斯盆地定边地区山西组流体包裹体的拉曼光谱特征[J].岩矿测试,2015,34(6):678-683.LI Yanxia,YAN Xinyi,TIAN Yufeng.Raman spectra characteris-tics of fluid inclusion in the Shaanxi formation of the Dingbian areain the Ordos basin[J].Rock and Mineral Analysis,2015,34(6):678-683.
[2]KARLSEN D A,NEDKVITNE T,LARTER S T.Hydrocarbon com-position of authigenic inclusions:application to elucidation of petro-leum reservoir filling history[J].Geochimica et Cosmochimica Acta,1993,57(15):3 641-3 659.
[3]李艳霞,赵靖舟,李净红.鄂尔多斯盆地东部上古生界气藏成藏史[J].兰州大学学报(自然科学版),2011,47(3):29-34.LI Yanxia,ZHAO Jingzhou,LI Jinghong.Gas accumulation historyin Upper Palaeozoic,east of Erdos basin[J].Journal of LanzhouUniversity(Natural Sciences),2011,47(3):29-34.
[4]李艳霞,田毓峰,李净红.鄂尔多斯盆地低丰度大型岩性气田成藏机理——以榆林气田为例[J].新疆石油地质,2012,33(4):408-412.LI Yanxia,TIAN Yufeng,LI Jinghong.Formation mechanism oflarge and low-abundance lithologic gas fields in Ordos basin—an ex-ample from Yulin gas field[J].Xinjiang Petroleum Geology,2012,33(4):408-412.
[5]MARK O,STUART H.Evidence for resetting of fluid inclusion tem-peratures from quartz cements in oil fields original research article[J].Marine and Petroleum Geology,1993,10(3):271-278.
[6]AYUMI H,REINHARD K,ANTHONY D P,et al.Evolution of quartzcementation and burial history of the Eau Claire formation based onin situ oxygen isotope analysis of quartz overgrowths original re-search article[J].Chemical Geology,2014,384(25):168-180.
[7]刘德汉,卢焕章,肖贤明.油气包裹体及其在石油勘探和开发中的应用[M].广东:广东科技出版社,2007:38-43.LIU Dehan,LU Huanzhang,XIAO Xianming.Application of liquidand gaseous inclusion to petroleum exploration and production[M].Guangdong:Guangdong Science&Technology Press,2007:38-43.
[8]陈勇,BURKE E A J.流体包裹体激光拉曼光谱分析原理、方法、存在的问题及未来研究方向[J].地质评论,2009,55(6):851-861.CHEN Yong,BURKE E A J.Laser Raman microspectroscopy of flu-id inclusions:theory,method,problems and future trends[J].Geo-logical Review,2009,55(6):851-861.
[9]李荣西,王志海,李月琴.应用显微激光拉曼光谱分析单个流体包裹体同位素[J].地学前缘,2012,19(4):135-140.LI Rongxi,WANG Zhihai,LI Yueqin.Analysis of isotope of individ-ual fluid inclusion by means of laser Raman spectoscopy[J].EarthScience Frontiers,2012,19(4):135-140.
[10]朱华东,罗勤,周理,等.激光拉曼光谱及其在天然气分析中的应用展望[J].天然气工业,2013,33(11):110-114.ZHU Donghua,LUO Qin,ZHOU Li,et al.Application prospect ofnatural gas companent analysis using Laser Raman spectroscopy[J].Natural Gas Industry,2013,33(11):110-114.
[11]李艳霞,闫新义,田毓峰.鄂尔多斯盆地定边地区山西组流体包裹体的拉曼光谱特征[J].岩矿测试,2015,34(6):678-683.LI Yanxia,YAN Xinyi,TIAN Yufeng.Raman spectra characteris-tics of fluid inclusion in the Shaanxi formation of the Dingbian areain the Ordos basin[J].Rock and Mineral Analysis,2015,34(6):678-683.