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通过将地质参数构成的反射率剖面与3.5千赫实测地震脉冲进行褶积,构制了巴西盆地 DSDP515井位处的合成地震剖面。声阻抗用62米长的液压活塞岩芯剖面(515A井)上每10厘米测定的碳酸盐含量计算。合成地震记录和井位附近两、条十字交叉的3.5千赫回声测深剖面彼此有惊人的相似性,表明碳酸盐含量控制着此处的3.5千赫记录。尽管相邻碳酸盐峰值带上反射的脉冲之间的干扰,有时会改变反射剖面的特性,但特殊反射层仍可用特殊的碳酸盐峰来对比。以前的研究表明,该岩芯的碳酸盐含量峰值带相当于浊积物。在不具备基本物性资料之处,此法可用来制造沉积岩芯的合成地震记录。
Synthetic seismic sections at well DSDP515 in Brazil Basin were constructed by convolution of the reflectance profile of geological parameters with the 3.5 kHz measured seismic pulse. The acoustic impedance is calculated as carbonate content per 10 cm measured on a 62 m long hydraulic piston core profile (well 515A). The synthetic seismograms and the two, cross-hatched 3.5 kHz echo sounding profiles near the well location have striking resemblances to each other, indicating that the carbonate content controls the 3.5 kHz record here. The characteristics of the reflection profile are sometimes altered in spite of the interference between the reflected pulses on the adjacent carbonate peaks, but the special reflecting layer can still be compared with the special carbonate peak. Previous studies have shown that the carbonate peak in this core corresponds to turbidity. In the absence of basic physical data, this method can be used to make synthetic seismograms of sedimentary cores.