论文部分内容阅读
从五次详细的速度测量中得到了衰减值。在所有五口井中观测到的衰减有效量,最小衰减值是最大衰减值的十分之一,其变化范围小于0.1—0.9分贝/波长。就测量的分辨率范围来说,衰减与岩性之间的相关性是好的。其中一次测量完成于西得克萨斯,另外四次是在海湾地区完成的。在每次测量中,所记录的总深度的变化范围为31—208英尺。在关键地层带中,每隔10英尺或20英尺获取一张井下测量的记录。在全部五口井的测量中,井旁安置一个监视检波器来检测震源的一致性。在测量衰减值的过程中,要在每一个井下脉冲和一个特殊参考脉冲之间建立频谱比,然后从每一个频谱比中求出累积衰减(CA)值,并绘成做为检波器深度的函数的曲线图. 在测定每个深度间隔上的衰减值过程中,本方法要求进行多次测量。
The attenuation is obtained from five detailed speed measurements. The observed attenuation in all five wells, the minimum attenuation value is one tenth of the maximum attenuation, the range of variation is less than 0.1-0.9 dB / wavelength. The correlation between attenuation and lithology is good with respect to the range of resolution measured. One of the measurements was completed in West Texas, and the other four were done in the Gulf. The total depth recorded varies from 31 to 208 feet in each measurement. In key strata, take a downhole survey every 10 feet or 20 feet. In all five well surveys, a monitoring geophone was placed next to the well to detect source consistency. In measuring attenuation values, a spectral ratio is established between each downhole pulse and a particular reference pulse, then the cumulative attenuation (CA) value is found from each spectral ratio and plotted as the depth of the detector Function of the curve in the determination of each depth interval attenuation value process, the method requires multiple measurements.