三维感应测井仪多道数据采集系统的研究与设计.pdf

华中科技大学硕士学位论文

摘要
三维感应测井是一种新型的油气储层探测系统,它主要应用于各向异性油层的
勘探中,可直接测量水平电阻率和垂直电阻率,是人们认识地层特性,进行油、气
储层评价的有效方法。
本文通过对三维感应测井仪原理和特性的研究,提出了一种新型的三维感应测
井仪多道数据采集系统的设计方案。该设计方案以数字信号处理(DSP)和现场可
编程门阵列(FPGA)为核心架构,实现了整个系统的整体控制和数据处理功能。
三维感应测井仪多道数据采集系统主要由前置放大模块、滤波模块、模数转换模块、
采集控制和数据转换模块、数据处理模块、CAN 总线接口模块和电源等模块组成。
为了验证方案的可行性,文中首先对关键模块前置放大模块、滤波模块和差分
模块等进行了设计前仿真分析和计算。在软件设计方面,文中首先介绍了有限冲击
响应滤波(FIR)和数字相敏检波(DPSD)等数字信号处理算法的原理,然后结合
实际情况分别设计和实现了针对于本系统的有限冲击响应滤波(FIR)和数字相敏
检波算法(DPSD)。
实验结果表明,本系统在保证信号同步高速采集、采集效率以及数据可靠性的
同时能较好地从强环境噪声中检测到约为 4μV 的混频微弱信号。

关键词三维感应测井仪多道数据采集系统有限冲击响应滤波数字相敏检
波
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华中科技大学硕士学位论文
Abstract
Three-dimension induction logging is a whole new stratum structure detection
systems, which is mainly used for detecting the anisotropic reservoirs. It can directly
measure both horizontal and vertical resistivity. It is effective methods for people to
recognize the stratum characteristics and have an oil or gas reservoirs evaluation.
This paper puts forward a new kind design scheme of three-dimension induction
logging tool multi-channel data acquisition system. The design with digital signal
processing (DSP) and field programmable gates array (FPGA) as the core framework,
realized overall control and data processing function of the whole system. The
Three-dimension induction logging tool multi-channel data acquisition system is mainly
composed of the preamplifier module, filter module, modulus conversion module,
acquisition control and data conversion module, data processing module, CAN bus
interface module and power supply module.
In order to verify the feasibility of the design, this paper firstly has a simulation
analysis and calculation before design on the key modules such as the preamplifier
module, filter module and differential module. In software design, this paper firstly
introduces the digital signal processing algorithm principle of the finite impulse response
(FIR) filter and digital phase-sensitive detection (DPSD), an