摘要
数字检波器是近年来发展起来的一种新型检波装置.为了对比数字检波器与普通模拟检波器的差别,我们选择数字检波器DSU3与模拟检波器20dx进行了一个针对性的野外试验.从试验结果上来看,二者主要存在四个方面的差异.通过分析差异的原因,我们认为模拟检波经过多年的应用,从理论认识到实践操作都非常成熟,但是存在容易受到电磁干扰、信号串音、漏电等现象;同时,即使经过‘类检波器反褶积’后,模拟检波器仍然难以补偿数据的‘极低频’部分;模拟检波器的灵敏度有待于进一步提高,以便降低电噪声在全部信号中所占的比例,提高信噪比;数字检波器确实在电学指标方面取得了一些进步,尤其在灵敏度、线性畸变、线性频带范围、适量保真度等方面;但是,数字检波器在耦合效应,一致性、稳定性或者抗干扰能力均存在一些问题.同时,在石油勘探中‘强噪音’以及‘多次覆盖’的双重背景下,受当前处理能力的限制,检波器电学性能方面的‘极高指标’,并不能保证地震数据的‘极高质量’.我们的研究表明:使检波器更小、更轻、更好耦合的努力与电学指标的改进具有同等重要的意义;具有良好的电学性能,更好的耦合参数,稳定性好,耐用,价格合理的检波器是我们追求的目标.
The MEMS accelerometer is a kind of newly introduced device of receiving waves in seismic survey in the past decade. We conducted a field test to determine the differences between the analog geophone and the MEMS accelerometer. Four main differences have been showed by the test results. By tracking the reasons for these differences, we confirmed that MEMS accelerometer, DSU3 as an example, indeed have made some improvements, especially on the electric performances, such as linear frequency hand, distortion, sensitivity, vector fidelity, etc. However there are also some shortcomings with DSU3, such as bad coupling ability, inconsistency and vulnerable to EM interference. Only when the above issues were covered, DSU3 could make a systemic success. The analog geophone has been used for many years and is a reliable device both theoretically and practically, however it is easily to be influenced by EM interferences. At the same time the geophone cannot deal with the ultra low-frequency component of the ground＇s vibration, even after being compensated by deconvoiution indoors. Generally speaking, the attempt to achieve a better coupling ability of a sensor, including being lighter in mass, smaller in size, and moresuitable with regard to shape and material for spiking etc, has equal importance to the pursuit of higher electric performance on the road to enhance the seismic data quality. The sensor, which has outstanding electric performance, good coupling effect, stability, long lasting and economical to use etc,is our target.
出处
《地球物理学进展》
CSCD
北大核心
2013年第3期1398-1407,共10页
Progress in Geophysics
基金
胜利油田博士后基金(GKB0810)资助
关键词
野外试验
数字检波器
模拟检波器
电学指标
耦合效应
field test, MEMS accelerometer, analog geophone, electric performance, coupling effect
