柴达木盆地昆2井古近系下干柴沟组上、下段分界探讨
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摘要
青海油田和中国石油大学(北京)合作,在柴达木盆地昆2井井深5,120~5,140m发现南星介化石带。通过对比柴西地区和柴北缘地区南星介化石带的发现层位,并将该化石带顶界在地震剖面上进行标定追索,认为南星介(Austrocypris)是柴达木盆地下干柴沟组下段上部的标准化石。从发现南星介化石并标定有T4反射界面的冷科1井(或深88井)开始,沿地震测线向昆2井进行追索,经时深转换,将昆2井5,040m处标定为下干柴沟组上段与下段的分界。两井之间T4(下干柴沟组上、下段分界)、南星介化石带顶界和T5(下干柴沟组底)呈3条平行线,表明其得到闭合验证,下干柴沟组上、下段的分界划分合理。因此,生物地层学与地震地层学相结合,可以有效地对比柴达木盆地陆相新生界红色碎屑岩区的地层。
Through the collaboration between Qinghai Oilfield Company and China University of Petroleum(Beijing), ostracoda Austrocypris fossil zone was found in the interval about 5120 m to 5140 m in Well Kun-2, Qaidam Basin. By correlating with the Austrocypris fossil zone in the western and northern margins of the Qaidam Basin, its top boundary was calibrated with a seismic event and traced on the seismic profile. The results indicate that the Austrocypris is an index fossil of the upper part of Lower Member of Xiaganchaigou Formation in the Qaidam Basin. Tracing along the seismic lines from Well Lengke-1(or Shen-88) in which Austrocypris was found and T4 seismic reflector surface was marked, to Well Kun-2, after time to depth coversion the boundary between the upper and lower members of Xiaganchaigou Formation is determined to be at about 5040 m in Well Kun-2. The T4 seismic reflector surface, the top boundary of Austrocypris fossil zone and the T5 seismic reflector surface(at the bottom of Xiaganchaigou Formation) are always parallel with one another between the two wells. The boundary between the upper and lower members of Xiaganchaigou Formation is reasonable and its position is supported by the loop correlation of seismic events. In conclusion, combining biostratigraphy with seismic stratigraphy, an effective correlation of the Cenozoic stratigraphic succession of the red continental clastic rocks in the Qaidam Basin has been obtained.
Through the collaboration between Qinghai Oilfield Company and China University of Petroleum(Beijing), ostracoda Austrocypris fossil zone was found in the interval about 5120 m to 5140 m in Well Kun-2, Qaidam Basin. By correlating with the Austrocypris fossil zone in the western and northern margins of the Qaidam Basin, its top boundary was calibrated with a seismic event and traced on the seismic profile. The results indicate that the Austrocypris is an index fossil of the upper part of Lower Member of Xiaganchaigou Formation in the Qaidam Basin. Tracing along the seismic lines from Well Lengke-1(or Shen-88) in which Austrocypris was found and T4 seismic reflector surface was marked, to Well Kun-2, after time to depth coversion the boundary between the upper and lower members of Xiaganchaigou Formation is determined to be at about 5040 m in Well Kun-2. The T4 seismic reflector surface, the top boundary of Austrocypris fossil zone and the T5 seismic reflector surface(at the bottom of Xiaganchaigou Formation) are always parallel with one another between the two wells. The boundary between the upper and lower members of Xiaganchaigou Formation is reasonable and its position is supported by the loop correlation of seismic events. In conclusion, combining biostratigraphy with seismic stratigraphy, an effective correlation of the Cenozoic stratigraphic succession of the red continental clastic rocks in the Qaidam Basin has been obtained.
引文
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Exploration and Development Research Institute,Qinghai Petroleum Ad-ministration,Nanjing Institute of Geology and Palaeontology,Acade-mia Sinica.1988.Tertiary Ostracode Fauna from Qaidam Basin,NW China[M].Jiangsu Nanjing:Nanjing University Press,1-190(in Chinese with English abstract).
Ji Liming,Qiao Zizhen,Zhang Haiquan,et al.2007.Micropalaeontolo-gy of Eocene Lower Ganchaigou Formation in the Kunteyi Depressionof the northern margin of the Qaidam Basin[J].Acta Micropalae-ontologica Sinica,24(1):82-88(in Chinese with English ab-stract).
Jiang Xianting,Zhou Weifen,Lin Shupan,et al.1995.Stratigraphy andOstracods of Xinjiang in China[M].Beijing:Geological PublishingHouse,1-577(in Chinese).
Sun Zhencheng,Yang Fan.1998.Application of Modern Stratigraphy inPetroleum and Gas Exploration[M].Beijing:Petroleum IndustryPress,1-76(in Chinese).
Sun Zhencheng,Qiao Zizhen,Yang Gelian,et al.2002.Disccussion onownership of Qaidam Basin[J].Journal of Palaeogeography,4(1):59-66(in Chinese with English abstract).
Tang Lunhe,Di Hengshu.1991.Charophytes in Qaidam Basin[M].Beijing:Science and Technology Press,1-220(in Chinese).
Yang Fan,Tang Wensong,Wei Jingming,et al.1994.Tertiary in Petro-liferous Regions of China(Ⅱ):The Northwest Region of China[M].Beijing:Petroleum Industry Press,1-253(in Chinese).
Yang Fan,Qiao Zizhen,Zhang Haiquan,et al.2006.Features of theCenozoic ostracod fauna and environmental significance in QaidamBasin[J].Journal of Palaeogeography,8(2):143-156(in Chi-nese with English abstract).
Yang Ping,Sun Zhencheng,Li Dongming,et al.2000.Ostracoda ex-tinction and explosion events of the Mesozoic-Cenozoic in QaidamBasin,northwest China[J].Journal of palaeogeography,2(3):69-74(in Chinese with English abstract).
Yao Yimin,Liang Hongde,Cai Zhiguo,et al.1994.Tertiary in Petrolif-erous Regions of China(Ⅳ):The Bohai Gulf Basin[M].Beijing:Petroleum Industry Press,1-240(in Chinese).
Yuan Xiujun,Dong Ning,Zhang Haiquan.2005.Stratigraphic correla-tion of Paleogene in Lengke-1well,Qaidam Basin[J].XinjiangPetroleum Geology,26(4):459-461.
БодинаЛ Е.1961.ОстракодытретичныхотложенийЗайсанскойиИлийскойдепрессий.ВмикрофаунаСССРсборникХⅡ,ТрудыВнигри,Выпуск170[M].Ленинград:Гостоптехиздат,43-167.
Манделъштам М И,ШнейдерГФ,ЗанинойИЕ.1956.ОтрядOs-tracoda.ВКипарисовЛД,МарковскийБП,РадченкоГП(ред).Материалыпопалеонтологии,новыесемействаироды.Всегеи,Палеонология,НоваяСерияВыпуск12[M].Москва:Госгел-Техиздат,87-144.
Хохлова ИА.1966.ПоловойдиморфизмивосрастнаяизменчивостьнекоторыхолигоценовыхпредставителейродаKassinina[J].MатериалыпервоговсесоюзногоколлоквиумапоископаемыиостракодамЛьвов(1963):63-72.
蒋显庭,周维芬,林树磐,等.1995.新疆地层及介形类化石[M].北京:地质出版社,1-577.
青海石油管理局勘探开发研究院,中国科学院南京地质古生物研究所.1988.柴达木盆地第三纪介形类动物群[M].江苏南京:南京大学出版社,1-190.
孙镇城,杨藩.1998.现代地层学在油气勘探中的应用[M].北京:石油工业出版社,1-76.
孙镇城,乔子真,杨革联,等.2002.柴达木盆地归属问题[J].古地理学报,4(1):59-66.
唐伦和,狄恒恕.1991.柴达木盆地轮藻化石[M].北京:科学技术出版社.1-220.
杨藩,唐文松,魏景明,等.1994.中国油气区第三系(Ⅱ):西北油气区分册[M].北京:石油工业出版社,1-253.
杨藩,乔子真,张海泉,等.2006.柴达木盆地新生代介形类动物群特征及环境意义[J].古地理学报,8(2),143-156.
杨平,孙镇城,李东明,等.2000.柴达木盆地中、新生代介形类爆发与绝灭时间[J].古地理学报,2(3).69-74.
姚益民,梁鸿德,蔡治国,等.1994.中国油气区第三系(Ⅳ):渤海湾盆地油气区分册[M].北京:石油工业出版社,1-240.
袁秀军,董宁,张海泉.2005.冷科1井古近系地层对比[J].新疆石油地质,26(4):459-461.
Exploration and Development Research Institute,Qinghai Petroleum Ad-ministration,Nanjing Institute of Geology and Palaeontology,Acade-mia Sinica.1988.Tertiary Ostracode Fauna from Qaidam Basin,NW China[M].Jiangsu Nanjing:Nanjing University Press,1-190(in Chinese with English abstract).
Ji Liming,Qiao Zizhen,Zhang Haiquan,et al.2007.Micropalaeontolo-gy of Eocene Lower Ganchaigou Formation in the Kunteyi Depressionof the northern margin of the Qaidam Basin[J].Acta Micropalae-ontologica Sinica,24(1):82-88(in Chinese with English ab-stract).
Jiang Xianting,Zhou Weifen,Lin Shupan,et al.1995.Stratigraphy andOstracods of Xinjiang in China[M].Beijing:Geological PublishingHouse,1-577(in Chinese).
Sun Zhencheng,Yang Fan.1998.Application of Modern Stratigraphy inPetroleum and Gas Exploration[M].Beijing:Petroleum IndustryPress,1-76(in Chinese).
Sun Zhencheng,Qiao Zizhen,Yang Gelian,et al.2002.Disccussion onownership of Qaidam Basin[J].Journal of Palaeogeography,4(1):59-66(in Chinese with English abstract).
Tang Lunhe,Di Hengshu.1991.Charophytes in Qaidam Basin[M].Beijing:Science and Technology Press,1-220(in Chinese).
Yang Fan,Tang Wensong,Wei Jingming,et al.1994.Tertiary in Petro-liferous Regions of China(Ⅱ):The Northwest Region of China[M].Beijing:Petroleum Industry Press,1-253(in Chinese).
Yang Fan,Qiao Zizhen,Zhang Haiquan,et al.2006.Features of theCenozoic ostracod fauna and environmental significance in QaidamBasin[J].Journal of Palaeogeography,8(2):143-156(in Chi-nese with English abstract).
Yang Ping,Sun Zhencheng,Li Dongming,et al.2000.Ostracoda ex-tinction and explosion events of the Mesozoic-Cenozoic in QaidamBasin,northwest China[J].Journal of palaeogeography,2(3):69-74(in Chinese with English abstract).
Yao Yimin,Liang Hongde,Cai Zhiguo,et al.1994.Tertiary in Petrolif-erous Regions of China(Ⅳ):The Bohai Gulf Basin[M].Beijing:Petroleum Industry Press,1-240(in Chinese).
Yuan Xiujun,Dong Ning,Zhang Haiquan.2005.Stratigraphic correla-tion of Paleogene in Lengke-1well,Qaidam Basin[J].XinjiangPetroleum Geology,26(4):459-461.
БодинаЛ Е.1961.ОстракодытретичныхотложенийЗайсанскойиИлийскойдепрессий.ВмикрофаунаСССРсборникХⅡ,ТрудыВнигри,Выпуск170[M].Ленинград:Гостоптехиздат,43-167.
Манделъштам М И,ШнейдерГФ,ЗанинойИЕ.1956.ОтрядOs-tracoda.ВКипарисовЛД,МарковскийБП,РадченкоГП(ред).Материалыпопалеонтологии,новыесемействаироды.Всегеи,Палеонология,НоваяСерияВыпуск12[M].Москва:Госгел-Техиздат,87-144.
Хохлова ИА.1966.ПоловойдиморфизмивосрастнаяизменчивостьнекоторыхолигоценовыхпредставителейродаKassinina[J].MатериалыпервоговсесоюзногоколлоквиумапоископаемыиостракодамЛьвов(1963):63-72.
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