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深水区钻井稀少,且钻探深度浅,仅利用少量的钻井资料无法完成深水区深层砂泥岩分布以及沉积相分布预测,影响烃源岩及深层有利储集相带预测。以中国南海北部深水区D凹陷渐新统为对象,利用地震速度谱和钻井资料,通过速度岩性分析,预测砂泥岩分布特征,并综合分析地震相与单井沉积相、凹陷砂泥岩分布的匹配关系,划分D凹陷渐新统沉积相。结果表明:L组为海陆过渡沉积,Y组为滨浅海沉积。整个渐新统在凹陷中部和南部的浅海相以及Y组在凹陷边缘局部发育的海岸平原相等富泥沉积相,为有利的烃源岩发育相带,而Y组在凹陷边缘的扇三角洲相、滨海相以及L组在凹陷北部的三角洲相、扇三角洲相和滨海相等富砂沉积相为有利的储集相带。该方法克服资料不足的困难,降低传统地震相转沉积相预测方法的多解性,为深水区深层烃源岩以及有利储集相预测提供依据。
Deepwater drilling is rare and the drilling depth is shallow. The distribution of deep sandstone and mudstone in the deepwater area and the prediction of sedimentary facies distribution can not be completed with only a small amount of drilling data, affecting the prediction of source rock and deep favorable reservoir facies. Based on the D-depression Oligocene in the deep-water area of the northern South China Sea, the distribution characteristics of sandstone and mudstone are predicted by the velocity and lithology analysis using seismic velocity spectrum and drilling data. The distribution of sandstone and mudstone in seismic facies and single well, Matching relationship, divided D depression Oligocene sedimentary facies. The results show that L group is a transitional land-sea sediment and Y group is a coastal shallow sea sediment. The shallow Oligocene of the Oligocene in the central and southern part of the sag and the facies-rich muddy sedimentary facies of the coastal plain developed locally in the margin of the Y-Formation are facies facies facies belonged to the favorable source rocks. However, the fan delta facies in the Y- The coastal facies and the L-shaped facies in the northern sag of the sag are favorable facies facies for sedimentary facies. The method overcomes the difficulties of insufficient data, reduces the multi-solution of the prediction method of sedimentary facies of the traditional seismic phase inversion, and provides a basis for the prediction of deep source rocks and favorable reservoirs in the deep water area.