常规数字声波质量可靠性识别与应用

Quality and Reliability Identification of Conventional Digital Acoustic Logging and Its Application

塔里木油田越来越多井的孔隙度资料仅采集常规数字声波;储层的准确解释,要求数字声波时差质量必须满足测井解释要求。但数字声波测井资料在现场测井过程中,由于受到各种不同因素的影响,使得声波时差并不能完全直接用于测井解释。文中通过对数字声波测井仪器及采集原理的研究,分析了影响现场数字声波时差质量的各种原因;提出只有在全波包含纵波首波的情况下,才能对声波时差进行重新提取;以及检查数字声波时差质量可靠性的方法。该方法在现场进行了广泛应用,为储层解释提供了重要参考。

There are only conventional digital acoustic logging data which provide porosity information for more and more wells in Tarim oilfield.For correct interpretation of reservoirs,the digital acoustic time quality must meet the requirements of logging interpretation.But acoustic time can not be used in logging interpretation completely and directly because it is affected by different kinds of fatctors during logging.In the paper,various reasons which impacts acoustic time quality are analyzed through studying the tool structure and data acquisition principle.It is proposed that the acoustic time can be recomputed only when the first arrival of compress wave included in the full wave.It provides a method to check the reliability of digital acoustic time quality.This method is widely used in the field and provides an important reference for reservoir interpretation.