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介绍了应用钻井和三维地震资料来划分高精度(四级)层序和体系域的地震沉积学方法。其关键技术包括:(1)将地震数据进行90°相位调整来记录岩性,从而获得更完善的测井资料;(2)假设并解释沉积体系中连续的平面地貌特征。下面我们推荐一种新的解释方法,就是将高精度层序地层学的研究重点从解释垂直地震剖面转变为分析更加水平、分辨率更高的地震地貌信息。这方面的研究表明,有岩性限制的地震资料中,地层切片可提供通常为同沉积体系的连续地震图像。反过来,这种图像又可作为识别和划分高频体系域、层序边界以及层序地质年代范围的基础。在路易斯安那近海的中新统地层中,运用测井资料划分的四级层序或层序组,可通过地震资料来划分,地震数据体的主频为30Hz,相当于分辨率为30ft(10m)。所用的这一分辨率在井控外的地震覆盖区,对高精度层序地层格架进行精确再现非常有效。
This paper introduces the method of seismic sedimentology that uses drilling and 3D seismic data to classify high-precision (quaternary) sequences and system domains. The key technologies include: (1) 90 ° phase adjustment of seismic data to record lithology, resulting in better logging data; (2) Assumptions and interpretation of continuous planar topography in sedimentary systems. Here we recommend a new interpretation that shifts the focus of high-precision sequence stratigraphy from explaining vertical seismic profiles to analyzing more-level, higher resolution seismic landscape information. Research in this area shows that in lithologic-restricted seismic data, stratal slices provide continuous seismic images, often of the same sedimentary system. In turn, this image can be used as a basis for identifying and demarcating high-frequency system domains, sequence boundaries, and sequence-age geochronology. In the Miocene strata off the coast of Louisiana, the fourth-order sequences or sequence groups that are divided by log data can be divided by seismic data with a seismic frequency of 30 Hz, corresponding to a resolution of 30 ft 10m). The resolution used is very effective in accurately reproducing high-precision sequence stratigraphy frames outside the well-controlled seismic coverage area.