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近年来,西方阿特拉斯推出了一种新的多通道、全数字频谱感应系统,改进了对高清晰度感应测井的地层评价。该系统通过覆盖宽频带的多路接收器采集全部数据集;探测深度的广阔范围;确定储集岩中的侵入剖面。由于对冲洗带和过渡带进行了评价,使得油气流动性和真电阻率(R_t)的预测值能够更加可信,从而使测井分析和储量的估算更加精确。用不希望有的最小灵敏度处理仪器响应,以得到最佳分辨率(比如,由那些不规则的井眼尺寸和电导率侵入所引起的)。为了增强并使在所有探测深度上的垂向分辨率一致,也可应用拟合分辨率曲线。为了与补测的测井曲线比较,或者实行现场研究,全部数据集允许其它现用的感应仪器的合成测量结果。随着所钻的大角度井的增多,在斜井眼,或者钻入有明显视倾角的井中,估算精确的地层电阻率是重要的。多路接收器和宽频带使得在这样一个环境中,可能有可靠地聚焦仪器的测量结果。处理后的测井曲线相似于垂直地钻入同一地层所测得的测井特性曲线。该数据的完整性确保将来在其它处理技术中的开发,与其它测井曲线及储集层信息的综合,新的感应测量将明显地增强对储集层评价的能力。
In recent years, Western Atlas has introduced a new multi-channel, all-digital spectrum sensing system that improves the formation evaluation of high-resolution induction logging. The system acquires the entire dataset through a wide-band multiplex receiver; detects a wide range of depths; and determines the intrusion profile in reservoir rocks. The evaluation of both the wash zone and the transition zone has made the predictions of hydrocarbon mobility and true resistivity (R_t) more credible, resulting in more accurate logging and reserve estimates. The instrument response is processed with the least sensitivity desired, to get the best resolution (for example, due to irregular hole size and conductivity intrusion). To enhance and equalize the vertical resolution at all probing depths, a fitting resolution curve can also be applied. For comparison with the retest log, or to perform field studies, the entire data set allows for the synthesis of measurements from other active sensing instruments. As the number of high angle wells drilled increases, it is important to estimate the accurate formation resistivity in deviated wellbores or wells drilled with significant dip. Multiple receivers and wideband make it possible in such an environment to reliably focus instrument measurements. The processed logs are similar to those measured perpendicularly into the same formation. The data integrity ensures future developments in other processing technologies, integration with other well logs and reservoir information, and new sensing measurements will significantly enhance reservoir evaluation.