塔西南地区地层剥蚀厚度恢复研究
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摘要
根据塔里木盆地西南地区的实际条件 ,提出了相邻层厚度比值法和同一层内参考层厚度变化率法 ,并结合传统的声波时差法、沉积速率法、未被剥蚀地层厚度趋势延伸法 ,对塔西南地区的地层剥蚀厚度进行了恢复。相邻层厚度比值法是根据同一构造层内的沉积具有继承性和持续性这一特点 ,从而依据保存完整的相邻层厚度比值及下伏层厚度估算上覆层沉积厚度 ;参考层厚度变化率法是在计算点处的遭受剥蚀的地层底部选择一完整层段作为参考层 ,并以该层段厚度变化率作为整个地层的厚度变化率进行剥蚀厚度恢复。这一方法由于采用了地震资料 ,控制点多、可信度高 ;并以厚度资料为基础 ,因而几乎可以估算所有情况下的地层剥蚀厚度 ,具有广泛的适应性。
According to the geological data of the Southwestern Tarim Basin,authors have restored the strata erosion thickness of the area by use of these methods which are the thickness ratio of the nearby layers,the change ratio of reference layer thickness,and combining with traditional acoustic transit time and the deposition rate.To restore the strata erosion thickness by the thickness ratio of the nearby layers is based on the characteristic which the deposit has the heritage and succession in the same tectonic layer,and according to the thickness ratio of completely preserved nearby layers and the thickness of underlying layers;To restore the strata erosion thickness by the change ratio of reference layer thickness is chosen a complete layer as the reference layer in the bottom of erosion strata of the calculation points,and the change ratio of reference layer thickness is regarded as the change ratio of the whole strata thickness.Because the seismic data has been adopted,the reference points are many and the reliability is increased.Based on the thickness data,the strata erosion thickness has been calculated almost in all instances with the far ranging adaptability.
According to the geological data of the Southwestern Tarim Basin,authors have restored the strata erosion thickness of the area by use of these methods which are the thickness ratio of the nearby layers,the change ratio of reference layer thickness,and combining with traditional acoustic transit time and the deposition rate.To restore the strata erosion thickness by the thickness ratio of the nearby layers is based on the characteristic which the deposit has the heritage and succession in the same tectonic layer,and according to the thickness ratio of completely preserved nearby layers and the thickness of underlying layers;To restore the strata erosion thickness by the change ratio of reference layer thickness is chosen a complete layer as the reference layer in the bottom of erosion strata of the calculation points,and the change ratio of reference layer thickness is regarded as the change ratio of the whole strata thickness.Because the seismic data has been adopted,the reference points are many and the reliability is increased.Based on the thickness data,the strata erosion thickness has been calculated almost in all instances with the far ranging adaptability.
引文
[1] 马立祥利用砂岩孔隙度演化趋势估计古地层剥蚀量的简易方法[J]石油实验地质,1991,13(1):53～55
[2] MagaraK .Thicknessofremovedsediments,paleoporepressure,andpaleotemperature,southwesternpartofWesternCanadaBasin[J].Bull.Am.Assoc.Pet,Geol.,1976,(60):554～565
[3] 真柄钦次压实与流体运移[M]陈荷立,等译北京:石油工业出版社,1981:8～30
[4] GuidishTM ,etal.Basinevaluationusingburialhistorycalcuations:anoverview[J].AAPGBull,1985,69(1):92～105
[5] 牟中海柴达木盆地北缘侏罗系剥蚀厚度恢复[J]石油勘探与开发,2000,27(1):35～37
[2] MagaraK .Thicknessofremovedsediments,paleoporepressure,andpaleotemperature,southwesternpartofWesternCanadaBasin[J].Bull.Am.Assoc.Pet,Geol.,1976,(60):554～565
[3] 真柄钦次压实与流体运移[M]陈荷立,等译北京:石油工业出版社,1981:8～30
[4] GuidishTM ,etal.Basinevaluationusingburialhistorycalcuations:anoverview[J].AAPGBull,1985,69(1):92～105
[5] 牟中海柴达木盆地北缘侏罗系剥蚀厚度恢复[J]石油勘探与开发,2000,27(1):35～37
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