本文關(guān)鍵詞： 側(cè)向測(cè)井 信號(hào)預(yù)處理 數(shù)字相敏檢波 小波去噪　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著探測(cè)深度的不斷增加,鉆井液侵入地層特征越來(lái)越復(fù)雜,雙側(cè)向測(cè)井儀僅能提供深淺兩種模式下的視電阻率曲線,無(wú)法滿足復(fù)雜油氣評(píng)價(jià)的需求,研制多探測(cè)模式的新型陣列側(cè)向測(cè)井儀勢(shì)在必行。根據(jù)數(shù)值模擬結(jié)果,井下監(jiān)督電極上探測(cè)到的最小電壓幅度只有百納伏級(jí)別,且動(dòng)態(tài)范圍大,為了提高檢測(cè)的精度,需深入研究微弱信號(hào)檢測(cè)技術(shù)在側(cè)向測(cè)井中的應(yīng)用。 本文針對(duì)側(cè)向測(cè)井中的陣列側(cè)向測(cè)井微弱信號(hào)檢測(cè)技術(shù)進(jìn)行了研究,通過(guò)研究陣列側(cè)向測(cè)井工作模式,在分析側(cè)向測(cè)井中信號(hào)的特點(diǎn)的基礎(chǔ)上,提出了相應(yīng)檢測(cè)系統(tǒng)設(shè)計(jì)方案,包括硬件設(shè)計(jì)部分與數(shù)字信號(hào)處理關(guān)鍵技術(shù)的確定。硬件部分首先確定設(shè)計(jì)參數(shù)指標(biāo),重點(diǎn)部分為設(shè)計(jì)信號(hào)預(yù)處理電路,包括設(shè)計(jì)低噪聲前置放大器,選取濾波器的結(jié)構(gòu)及參數(shù),并進(jìn)行Multisim仿真分析。數(shù)字信號(hào)處理重點(diǎn)在于方案的選取。在Matlab仿真環(huán)境下,對(duì)比數(shù)字濾波器與小波變換的去噪結(jié)果發(fā)現(xiàn)后者效果更好,對(duì)比FFT變換算法與數(shù)字相敏檢波兩種不同算法檢測(cè)結(jié)果發(fā)現(xiàn)后者檢測(cè)準(zhǔn)確度更高,誤差更小,最后通過(guò)對(duì)比分析小波去噪結(jié)合數(shù)字相敏檢波與直接數(shù)字相敏檢波檢測(cè)的相對(duì)誤差,從時(shí)效性與精簡(jiǎn)設(shè)計(jì)考慮確定選用直接數(shù)字相敏檢波檢測(cè)方案,并設(shè)計(jì)了數(shù)字信號(hào)處理流程圖,最后對(duì)信號(hào)預(yù)處理印制電路板進(jìn)行了功能測(cè)試實(shí)驗(yàn),實(shí)驗(yàn)結(jié)果達(dá)到預(yù)定設(shè)計(jì)指標(biāo)。
[Abstract]:With the increasing depth, drilling fluid invasion formation characteristics become more and more complex, the dual laterolog instrument can only provide the depth of apparent resistivity curves under the two modes, can not meet the complex evaluation of oil and gas demand, development of a new type of array laterolog tool potential multi detection mode is necessary. According to the results of numerical simulation, the minimum voltage the amplitude monitor electrode to detect only bynano volt level, and high dynamic range, in order to improve the detection accuracy, the application needs further study of weak signal detection technology in lateral logging in.
This paper studies the weak signal detection technology of array laterolog in lateral logging was carried out, through the study of array lateral logging mode, based on analyzing the characteristics of the signal in the lateral logging, put forward corresponding design detection system, including hardware design and key technology of digital signal processing. The hardware part design parameter the key part is the design of indicators, signal pretreatment circuit, including the design of low noise preamplifier, select the filter structure and parameters, and analysis of Multisim simulation. Digital signal processing is the key for selection. In the Matlab simulation environment, comparison of digital filter and wavelet transform denoising results and find that the latter effect is better, compared to FFT transform algorithm and digital phase sensitive detection of two kinds of algorithm tests found that the latter detection accuracy, small error, finally Through the comparative analysis of wavelet denoising based on digital phase sensitive detection and direct digital phase sensitive detection from relative error detection, timeliness and streamline design considerations determine the selection of direct digital phase sensitive detection scheme, and the design of the digital signal processing flow chart, at the end of the signal preprocessing of printed circuit board of the function test, the experimental results met the design index.

【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P631.81

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