柴达木盆地冷湖地区中—晚始新世化石轮藻LAMPROTHAMNIUM GANCHAIGOUENSIS组合带及其层序生物地层学意义(英文)
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摘要
柴达木盆地冷湖构造的一些岩屑古生物分析发现 ,下干柴沟组上段存在一明显的化石轮藻 L amprothamni-um ganchaigouensis组合带 ,而且这一组合带底界与下干柴沟组上段与下段的地质分界相当。在地震时间剖面上 ,通过井间追层及化石对比 ,发现这一化石组合带底界均与 T4地震标准层相对应 ,形成了一个地震层序界面 (等时界面 )。因此 ,通过生物地层学与地震地层学的综合研究 ,可建立层序生物地层单元 ,具有层序生物地层学意义 ;地震与古生物资料的联合横向对比还可以帮助评估化石层位和标定地震标准层的相对位置 ,在生产实践中可节约成本 ,提高地层对比效率。
Palaeontological analyses from the borehole cuttings indicate a fossil charophyte Lamprothamnium ganchaigouensis assemblage zone of late Middle Eocene to early Late Eocene in the Upper Member of Lower Ganchaigou Fm. in Lenghu structural belt and Saixi structure of Qaidam basin. The lower boundary of the assemblage zone is corresponding to the stratigraphic boundary between the Upper Member and the Lower Member of Lower Ganchaigou Fm. On seismic sections, we found by level tracing and fossil correlating among some wells that the bottom boundary of the fossil assemblage zone is correlated with the seismic marker T4, so a seismic sequence boundary (chronohorizon) is recognized. The sequence biostratigraphic units can be established by comprehensive research of biostratigraphy and seismic stratigraphy. Lateral correlation integrating the data of palaeontology and seismology can be used to assess the levels of fossil and to calibrate the relative positions of the seismic markers. Cost could be reduced and efficiency of stratigraphic correlation could be enhanced in the cause of production by this mean.
Palaeontological analyses from the borehole cuttings indicate a fossil charophyte Lamprothamnium ganchaigouensis assemblage zone of late Middle Eocene to early Late Eocene in the Upper Member of Lower Ganchaigou Fm. in Lenghu structural belt and Saixi structure of Qaidam basin. The lower boundary of the assemblage zone is corresponding to the stratigraphic boundary between the Upper Member and the Lower Member of Lower Ganchaigou Fm. On seismic sections, we found by level tracing and fossil correlating among some wells that the bottom boundary of the fossil assemblage zone is correlated with the seismic marker T4, so a seismic sequence boundary (chronohorizon) is recognized. The sequence biostratigraphic units can be established by comprehensive research of biostratigraphy and seismic stratigraphy. Lateral correlation integrating the data of palaeontology and seismology can be used to assess the levels of fossil and to calibrate the relative positions of the seismic markers. Cost could be reduced and efficiency of stratigraphic correlation could be enhanced in the cause of production by this mean.
引文
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TANG Lun-he,DI Heng-shu,1991.Fossil charophytes fromQaidamBasin,Scientific andTechnicalDocumentsPublishingHouse.1—220( inChinese withEnglish abstract)
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SUN Jia-zhen,LI L an-bin,1997.Polyinformation prediction ofreservoir and discrimination of petroliferous property( princi-ple,m ethod and example),ChinaUniversity ofGeosciencesPress( inChinese).
TAN Jian-xun,1997.Several important directions in developing ofsequence stratigraphy.L ithofaciesPalaeogeography,17(2):63—70( inChinese withEnglish abstract)
TANG Lun-he,DI Heng-shu,1991.Fossil charophytes fromQaidamBasin,Scientific andTechnicalDocumentsPublishingHouse.1—220( inChinese withEnglish abstract)
WU Rui-tang,WANG Zhi-ping,1992.Principles and methods onstratigraphy,GeologyPublishingHouse( inChinese withEng-lish abstract)
WU Rui-tang,ZHANG Shou-xing etal.,1989.Modern stratigra-phy.ChinaU niversity ofGeosciencesPress( inChinese withEnglish abstract)
YANG F an,TANG Wen-song,WEI Jing-m ing,FU Zhi-yan,LIANG Shi-jun et al.,1994.Tertiary in petroliferous regionsofChina().The northwest region ofChina,PetroleumIn-dustryPress( inChinese).
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