Agip公司YHD-1井地层对比的思考与教训
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摘要
2002年柴达木盆地YHD-1井地层设计与完井地层对比错误的原因,是沿用了1959年盐新深1井和1995年盐14井错误的分层资料。Agip公司完井总结报告认为,已钻达目的层为古近纪始新世—古新世路乐河组沉积,但本文认为尚未钻穿新近纪中新世下油砂山组沉积。两者对井底地层时代判断至少相差26Ma,占新生代65Ma的2/5。在分析了Agip公司对比错误原因的基础上,阐述了沉积构造复杂、多物源的柴达木盆地新生代地层对比,应采用综合对比方法,尤其是地震地层学与生物地层学结合渗透的方法。
The mistake of strata comparison between designed boundary and the real boundary by well completion of well YHD-1 in 2002 in Qaidam Basin was made, its reason would be the result of continuing to use the wrong data of strata division from well Yanshen-1(1959) and well Yan-14(1995). Agip's summary report of well completion said that the aim bed drilled would be Paleocene-Eocene Lulehe Formation, but the authors keep opposed opinion that the above boundary is still drilled into Miocene Xiayoushashan Formation. The age value of stratum at well bottom estimated by both parties has larger difference, which is at least the discrepancy of 26Ma, accounting for second fifth of Cenozoic era(65Ma).On the basis of analysis on the cause of false comparison by Agip Company, it sets forth that the comparison of Cenozoic strata of Qaidam Basin, which feature in complex sedimentary structure and multiple material sources, should be adopted comprehensive correlation method, especially integrating seismic stratigraphy with biological stratigraphy method.
The mistake of strata comparison between designed boundary and the real boundary by well completion of well YHD-1 in 2002 in Qaidam Basin was made, its reason would be the result of continuing to use the wrong data of strata division from well Yanshen-1(1959) and well Yan-14(1995). Agip's summary report of well completion said that the aim bed drilled would be Paleocene-Eocene Lulehe Formation, but the authors keep opposed opinion that the above boundary is still drilled into Miocene Xiayoushashan Formation. The age value of stratum at well bottom estimated by both parties has larger difference, which is at least the discrepancy of 26Ma, accounting for second fifth of Cenozoic era(65Ma).On the basis of analysis on the cause of false comparison by Agip Company, it sets forth that the comparison of Cenozoic strata of Qaidam Basin, which feature in complex sedimentary structure and multiple material sources, should be adopted comprehensive correlation method, especially integrating seismic stratigraphy with biological stratigraphy method.
引文
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