吐哈盆地红台地区中侏罗统地震相分析
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摘要
吐哈盆地红台地区中侏罗统在地震剖面上分别表现为强振幅、中低频、高连续、亚平行反射,中强振幅、低频、高连续、平行反射,弱振幅、低频、中连续、平行反射和空白反射等特征。本文根据中侏罗统地震反射特征,按地震相分析方法对地震道波形进行分类,并转换为地震相。据此对红台地区大致划分10类地震相,构成四个地震相分布区,分别对应低频区、高频区和中频区(与两个相区对应)。低频区对应砂岩,高频区对应泥岩,中频区对应的岩性介于砂岩和泥岩之间。依据地震相分布图编制了S2砂层组的沉积微相图,经钻井资料证实,井点处沉积微相类型与井孔岩心微相有较好的一致性。
The show of Middle Jurassic in Hongtai area of Tu-Ha basin on seismic sections is very continuous and pseudo-parallel reflections with strong amplitude and mid-low frequency, very continuous and parallel reflections with slightly strong amplitude and low frequency and slightly continuous and parallel reflections with weak amplitude and low frequency as well as blind zone of reflections. Based on the feature of Middle Jurassic seismic reflections the paper categorized the waveforms of seismic channels by the analytic method of seismic facies and transformed them into seismic facies. It divided 10 seismic facies generally for the Hongtai area according to analyzed results, constituting 4 areas of seismic facies, corresponding to low-frequency area, high-frequency area and mid-frequency area (relative to two facies areas) respectively. The low-frequency area is relative to sand rock, high-frequency area—mud rock and mid-frequency area—between sand and mud rocks. The sedimentary micro-facies map in S2 sand body is compiled based on seismic facies spreading map, which is proved by drilling data that the sedimentary micro-facies type at well site has good coincidence to that of well core.
The show of Middle Jurassic in Hongtai area of Tu-Ha basin on seismic sections is very continuous and pseudo-parallel reflections with strong amplitude and mid-low frequency, very continuous and parallel reflections with slightly strong amplitude and low frequency and slightly continuous and parallel reflections with weak amplitude and low frequency as well as blind zone of reflections. Based on the feature of Middle Jurassic seismic reflections the paper categorized the waveforms of seismic channels by the analytic method of seismic facies and transformed them into seismic facies. It divided 10 seismic facies generally for the Hongtai area according to analyzed results, constituting 4 areas of seismic facies, corresponding to low-frequency area, high-frequency area and mid-frequency area (relative to two facies areas) respectively. The low-frequency area is relative to sand rock, high-frequency area—mud rock and mid-frequency area—between sand and mud rocks. The sedimentary micro-facies map in S2 sand body is compiled based on seismic facies spreading map, which is proved by drilling data that the sedimentary micro-facies type at well site has good coincidence to that of well core.
引文
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[6]Posamentier H W,Suyenaga W.Stratigraphic analysis of the main menber of the Upper Cibulakan Formation at E Field,offshore Northwest Java,Indonesia.26th ANNUINDON PETROL ASS CONV,1998,1
[7]Senechal P,Perroud H.Interpretation of reflection at-tributes in a3-d GRP(ground-penetrating radar)sur-vey at Vallee D'ossau,Western Pyrenees,France.Ge-ophysics,2000,65(5)
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