本文選題：高分辨率 + 自然伽馬��； 參考：《東北石油大學(xué)》2015年碩士論文

【摘要】：自然伽馬測井的基本原理是利用不同巖性中天然放射性元素含量上的差異,通過放射性探頭——NaI晶體直接測量井軸上的自然伽馬射線強(qiáng)度在井眼周圍的變化,借此進(jìn)行泥質(zhì)含量計(jì)算、地層對比、地層剖面劃分,以及追蹤射孔和探尋放射性礦物等。自然伽馬測井曲線作為常規(guī)解釋中最常用的巖性曲線,而薄互層中自然伽馬測井曲線受到上下圍巖的影響不能準(zhǔn)確反映地層的真實(shí)情況,所以準(zhǔn)確識別這樣的儲層,提高儲層參數(shù)的計(jì)算精度,盡量使自然伽馬曲線的測值接近于真值是十分必要的。由于自然放射性強(qiáng)度受地層條件影響,通常不能滿足自然伽馬探測器的計(jì)數(shù)率要求,為了克服放射性統(tǒng)計(jì)漲落效應(yīng)等影響曲線精度的因素,保證足夠的探測精度,當(dāng)前國內(nèi)外自然伽馬探測器常選用較大的單一NaI晶體作為探頭,其自然伽馬測井曲線的縱向分辨率最高僅達(dá)到0.6m左右,而今大部分油田已到勘探開發(fā)后期,已無法滿足對薄差儲層勘探開發(fā)的需要。找到一種即能克服自然伽馬曲線放射性統(tǒng)計(jì)漲落誤差,同時(shí)可以提高自然伽馬曲線縱向分辨率的數(shù)據(jù)處理方法,為油田挖掘薄層開采潛力,有著重要的實(shí)際意義。本文結(jié)合自然伽馬核物理理論基礎(chǔ),以及多探頭自然伽馬測井儀器設(shè)計(jì)原理,建立自然伽馬探測器體積模型,驗(yàn)證多探頭自然伽馬儀器相較于傳統(tǒng)單一探頭自然伽馬儀器的優(yōu)點(diǎn)。利用高分辨率處理方法對測井資料進(jìn)行預(yù)處理,同時(shí)對多探頭自然伽馬測井?dāng)?shù)據(jù)進(jìn)行深度校正,進(jìn)一步提高本文章的研究在實(shí)際應(yīng)用上的效果。以自適應(yīng)濾波理論為基礎(chǔ),確立多變量非線性自適應(yīng)濾波方法,求取增益調(diào)整權(quán)系數(shù),合成多條自然伽馬曲線。通過處理測井資料,與微梯度、微電極等測井資料以及常規(guī)單探頭自然伽馬測井曲線進(jìn)行對比,分辨率明顯提高,對薄層的響應(yīng)明顯,通過巖心分析泥質(zhì)含量對比進(jìn)行應(yīng)用效果驗(yàn)證,平均誤差小于4%,應(yīng)用效果良好。
[Abstract]:The basic principle of natural gamma logging is to make use of the difference of natural radioactive elements in different lithology and directly measure the change of natural gamma ray intensity around the borehole through the radioactive probe-Nai crystal. It is used to calculate muddy content, stratigraphic correlation, stratigraphic profile division, and to trace perforation and explore radioactive minerals. The natural gamma log curve is the most commonly used lithologic curve in conventional interpretation, but the natural gamma logging curve in thin interbed can not accurately reflect the real situation of the formation by the influence of the upper and lower rock, so the reservoir can be accurately identified. It is necessary to improve the calculation accuracy of reservoir parameters and make the measured value of natural gamma curve approach the true value as far as possible. Because the natural radioactivity intensity is affected by the formation condition, it usually can not meet the requirement of the natural gamma detector's counting rate. In order to overcome the factors that affect the precision of the curve, such as the effect of radioactive statistical fluctuation, we can ensure the sufficient detection precision. At present, the natural gamma detectors at home and abroad often choose a large single NaI crystal as the probe. The vertical resolution of the natural gamma log curve is only about 0.6 m. Now most oilfields have reached the late stage of exploration and development. Can not meet the thin reservoir exploration and development needs. It is of great practical significance to find a data processing method that can overcome the statistical fluctuation error of radioactivity of natural gamma curve and improve the vertical resolution of natural gamma curve. It is of great practical significance to exploit the potential of thin layer exploitation for oil field. Based on the theory of natural gamma nuclear physics and the design principle of multi-probe natural gamma logging tool, the volume model of natural gamma detector is established in this paper. Verify the advantages of multi-probe natural gamma instrument compared with traditional single-probe natural gamma instrument. The high resolution processing method is used to preprocess the logging data and the depth correction of the multi-probe natural gamma logging data is carried out to further improve the effect of the research in the practical application of this paper. Based on the theory of adaptive filtering, the multivariable nonlinear adaptive filtering method is established, the gain adjustment weight coefficient is obtained, and many natural gamma curves are synthesized. By processing logging data and comparing them with microgradient, microelectrode and conventional single probe natural gamma logging curves, the resolution is improved obviously and the response to thin layer is obvious. The average error is less than 4 and the application effect is good.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P631.817

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