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    利用彈性參數(shù)識(shí)別致密砂巖儲(chǔ)層流體性質(zhì)

    2015-01-07 19:32:06邊會(huì)媛王飛岳崇旺張永浩
    關(guān)鍵詞:氣層里格測(cè)井

    邊會(huì)媛+王飛+岳崇旺+張永浩

    摘要:鄂爾多斯盆地蘇里格氣田致密砂巖儲(chǔ)層的孔隙結(jié)構(gòu)復(fù)雜,儲(chǔ)層低孔、低滲、非均質(zhì)性特征明顯,儲(chǔ)層流體識(shí)別困難。基于偶極聲波測(cè)井資料,以致密砂巖巖石彈性參數(shù)為基礎(chǔ),利用指標(biāo)法、交會(huì)圖分析法、支持向量機(jī)進(jìn)行儲(chǔ)層流體性質(zhì)識(shí)別的方法研究。結(jié)果表明:縱橫波時(shí)差比、地層壓縮系數(shù)與泊松比比值、縱波彈性模量差比可以作為氣層識(shí)別的指標(biāo);引入流體敏感度評(píng)價(jià)參數(shù),優(yōu)選出能敏感反映儲(chǔ)層含氣性的彈性參數(shù),如拉梅系數(shù)與密度之積、拉梅系數(shù)、體積模量、拉梅系數(shù)與剪切模量之比、彈性模量,結(jié)合支持向量機(jī)對(duì)流體進(jìn)行識(shí)別,能夠提高流體識(shí)別精度;對(duì)有試氣結(jié)論的儲(chǔ)層樣本進(jìn)行實(shí)際分類(lèi)處理,利用支持向量機(jī)判別樣本的成功率為92%。通過(guò)對(duì)蘇里格氣田的X350井進(jìn)行實(shí)際分類(lèi)處理,并經(jīng)過(guò)試氣結(jié)論驗(yàn)證,證明優(yōu)選能敏感反映儲(chǔ)層含氣性的彈性參數(shù),結(jié)合支持向量機(jī)對(duì)儲(chǔ)層流體進(jìn)行識(shí)別的方法是切實(shí)可行的。

    關(guān)鍵詞:測(cè)井學(xué);流體識(shí)別;彈性參數(shù);氣層指標(biāo);支持向量機(jī);敏感度;交會(huì)圖;致密砂巖

    中圖分類(lèi)號(hào):P631;TE122文獻(xiàn)標(biāo)志碼:A

    0引言

    儲(chǔ)層含氣時(shí),巖石的力學(xué)參數(shù)將會(huì)發(fā)生改變,如縱波時(shí)差增大,橫波時(shí)差基本不變,儲(chǔ)層巖石泊松比降低,地層壓縮系數(shù)升高等[1]。利用偶極聲波測(cè)井資料分析得到的縱橫波時(shí)差,結(jié)合常規(guī)密度測(cè)井資料可以得到儲(chǔ)層巖石的彈性模量、體積模量以及泊松比等巖石力學(xué)參數(shù),這些彈性參數(shù)都能在一定程度上反映儲(chǔ)層的含氣性[24]。支持向量機(jī)結(jié)構(gòu)簡(jiǎn)單,泛化能力比較強(qiáng),且能夠克服神經(jīng)網(wǎng)絡(luò)存在局部極小點(diǎn)的缺點(diǎn),尤其是在解決小樣本、非線(xiàn)性和高維數(shù)模式識(shí)別方面具有特有的優(yōu)勢(shì),能夠用于儲(chǔ)層的流體識(shí)別[510]。

    蘇里格氣田致密砂巖儲(chǔ)層的孔隙結(jié)構(gòu)復(fù)雜,儲(chǔ)層低孔、低滲、非均質(zhì)性特征明顯,儲(chǔ)層流體識(shí)別困難[1112]。筆者利用偶極聲波測(cè)井資料,建立縱橫波時(shí)差比、地層壓縮系數(shù)與泊松比比值、縱波彈性模量差比3個(gè)氣層識(shí)別指標(biāo)來(lái)進(jìn)行流體識(shí)別,并且利用交會(huì)圖分析法研究巖石各種彈性屬性之間的相互關(guān)系,確定能夠區(qū)分儲(chǔ)層巖性及含氣性的彈性參數(shù)。由于蘇里格氣田地質(zhì)條件復(fù)雜,交會(huì)圖分析法不能將反映儲(chǔ)層流體性質(zhì)的影響因素綜合考慮進(jìn)來(lái),進(jìn)而影響流體性質(zhì)的識(shí)別精度,為此引入流體敏感度評(píng)價(jià)參數(shù),優(yōu)選出反映儲(chǔ)層含氣性敏感的彈性參數(shù),結(jié)合支持向量機(jī)對(duì)流體進(jìn)行識(shí)別,提高流體識(shí)別精度。

    1單參數(shù)流體識(shí)別指標(biāo)法

    在含氣地層中,地層縱波速度減小明顯,而橫波速度基本不變,因此,與飽含水地層的縱橫波速度比比較,含氣地層的縱橫波速度比偏小,并且油、氣、水的壓縮系數(shù)是不同的。氣的壓縮系數(shù)最大,水的壓縮系數(shù)最?。ū?)。根據(jù)氣、水的這些性質(zhì)可以識(shí)別氣層。

    1.1縱橫波時(shí)差比

    當(dāng)巖石中天然氣飽和時(shí),縱波時(shí)差會(huì)增大,橫波時(shí)差基本不變,導(dǎo)致縱橫波時(shí)差比增大,因此,可通過(guò)完全飽和水時(shí)縱橫波時(shí)差比與實(shí)測(cè)縱橫波時(shí)差比的差值來(lái)指示氣層。

    氣層識(shí)別指標(biāo)ΔR的計(jì)算公式為ΔR=DTRW-DTR(3)流體識(shí)別標(biāo)準(zhǔn):通過(guò)聲波全波資料獲得儲(chǔ)層含氣時(shí)巖石的縱橫波時(shí)差比實(shí)際值,將其與純水層巖石的縱橫波時(shí)差比進(jìn)行比較,當(dāng)前者大于后者時(shí),即儲(chǔ)層縱橫波時(shí)差比小于水層背景值,則認(rèn)為儲(chǔ)層是氣層。

    1.2地層壓縮系數(shù)與泊松比比值

    當(dāng)巖石中天然氣飽和時(shí),地層壓縮系數(shù)(CB)增大,泊松比(σ)減小,從而導(dǎo)致CB/σ值增大。地層壓縮系數(shù)計(jì)算公式為[15]CB=1/K=1/[ρ(V2p-4V2s/3)](4)泊松比計(jì)算公式為σ=(VpVs)2-22[(VpVs)2-1](5)式中:ρ為地層體積密度;K為流體飽和巖石體積模量;Vp為地層縱波速度;Vs為地層橫波速度。

    流體識(shí)別標(biāo)準(zhǔn):當(dāng)巖石中天然氣飽和時(shí),地層壓縮系數(shù)會(huì)增大,泊松比會(huì)減小,地層壓縮系數(shù)與泊松比呈鏡像變化特征。

    1.4小結(jié)

    利用縱橫波時(shí)差比、地層壓縮系數(shù)與泊松比比值、縱波彈性模量差比3個(gè)指標(biāo)對(duì)實(shí)際資料進(jìn)行處理(圖1)。由圖1可見(jiàn),含氣儲(chǔ)層的地層壓縮系數(shù)與泊松比曲線(xiàn)成麻花狀。儲(chǔ)層含氣時(shí)巖石的縱橫波時(shí)差比小于純水層巖石的縱橫波時(shí)差比,巖石的氣層識(shí)別指標(biāo)大于純水層氣層識(shí)別指標(biāo);對(duì)于水層,儲(chǔ)層含氣時(shí)巖石的縱橫波時(shí)差比與純水層巖石的縱橫波時(shí)差比重合,巖石的氣層識(shí)別指標(biāo)小于純水層氣層識(shí)別指標(biāo),彈性指標(biāo)能很好地區(qū)分氣層和水層。

    2利用交會(huì)圖分析法識(shí)別流體性質(zhì)

    交會(huì)圖分析法可以對(duì)各種屬性之間的關(guān)系進(jìn)行研究,成為儲(chǔ)層描述的重要研究方法之一[1724]。利用交會(huì)圖分析法對(duì)蘇里格氣田有試氣資料的地層進(jìn)行研究,分析顯示巖石的彈性參數(shù)能夠很好地區(qū)分巖性,并且對(duì)氣層與非氣層也有明顯的指示作用。因此,選取蘇里格氣田盒8段儲(chǔ)層有試氣結(jié)論的井段數(shù)據(jù)做交會(huì)圖(圖2)。

    3利用支持向量機(jī)識(shí)別流體性質(zhì)

    雖然交會(huì)圖可以在一定程度上將流體識(shí)別出來(lái),但是交會(huì)圖的確立受人為影響比較大,并且蘇里格氣田地質(zhì)條件復(fù)雜,交會(huì)圖分析法不能將反映儲(chǔ)層流體性質(zhì)的影響因素綜合考慮進(jìn)來(lái),進(jìn)而影響流體性質(zhì)的識(shí)別精度。由于不同彈性參數(shù)對(duì)流體識(shí)別敏感度不同,篩選儲(chǔ)層含氣時(shí)靈敏度比較高的參數(shù),引入支持向量機(jī)綜合識(shí)別流體性質(zhì)[2526]。

    3.1流體參數(shù)敏感性分析

    為了定量確定各彈性參數(shù)對(duì)流體識(shí)別的靈敏度,定義流體識(shí)別敏感度參數(shù)(S)的計(jì)算公式為S=2|P-Pg|P+Pg(8)式中:P、Pg分別為干層和氣層的流體識(shí)別因子。

    流體識(shí)別敏感度參數(shù)越大,說(shuō)明識(shí)別因子對(duì)氣層的識(shí)別效果越好。對(duì)不同彈性參數(shù)區(qū)分氣層與干層的靈敏度進(jìn)行分析(圖3),區(qū)分氣層與干層敏感度較好的參數(shù)依次為拉梅系數(shù)與密度之積(λρ)、拉梅系數(shù)(λ)、體積模量(K)、拉梅系數(shù)與剪切模量之比(λ/G)、彈性模量(E)、剪切模量(G)、泊松比(σ)、縱波阻抗(Ip)、橫波阻抗(Is)、橫波速度(Vp)、縱波速度(Vs)、縱橫波速度比(Vp/Vs)。

    3.2支持向量機(jī)的原理

    支持向量機(jī)是一種機(jī)器學(xué)習(xí)方法。其統(tǒng)計(jì)學(xué)習(xí)理論是采用結(jié)構(gòu)風(fēng)險(xiǎn)最小化準(zhǔn)則,在最小化樣本點(diǎn)誤差的同時(shí),最小化結(jié)構(gòu)風(fēng)險(xiǎn),提高模型的泛化能力,且沒(méi)有數(shù)據(jù)維數(shù)的限制。利用支持向量機(jī)算法進(jìn)行流體識(shí)別的具體步驟如下[2729]。

    第1步:產(chǎn)生訓(xùn)練樣本/預(yù)測(cè)樣本。在蘇里格氣田選取有試氣結(jié)論的儲(chǔ)層,將不同儲(chǔ)層所對(duì)應(yīng)的彈性參數(shù)作為訓(xùn)練樣本,利用支持向量機(jī)對(duì)樣本進(jìn)行訓(xùn)練。訓(xùn)練所用的彈性參數(shù)選取流體識(shí)別靈敏度最高的5個(gè)彈性參數(shù),分別為拉梅系數(shù)與密度之積、拉梅系數(shù)、體積模量、拉梅系數(shù)與剪切模量之比、彈性模量。訓(xùn)練選取的樣本為100個(gè),其中氣水同層樣本10個(gè),氣層樣本25個(gè),差氣層樣本15個(gè),干層樣本20個(gè),泥巖樣本30個(gè);另選取有試氣結(jié)論的50個(gè)樣本作為預(yù)測(cè)樣本。

    第2步:創(chuàng)建/訓(xùn)練支持向量機(jī)診斷模型。由于系統(tǒng)中各影響因素量綱不同,在比較分析時(shí)會(huì)很大程度地影響權(quán)重,難以得到正確結(jié)論,所以在創(chuàng)建支持向量機(jī)診斷模型前需要對(duì)彈性參數(shù)進(jìn)行歸一化處理;同時(shí),選擇合適的核函數(shù)類(lèi)型及參數(shù)。筆者選用徑向基核函數(shù)(RBF),并用粒子群算法尋找最佳參數(shù)c(懲罰因子)和參數(shù)g(RBF核函數(shù)中的方差),然后利用最佳參數(shù)訓(xùn)練診斷模型。

    第3步:預(yù)測(cè)樣本測(cè)試。當(dāng)支持向量機(jī)診斷模型訓(xùn)練好后,輸入預(yù)測(cè)樣本的類(lèi)別標(biāo)簽,并利用創(chuàng)建好的診斷模型對(duì)預(yù)測(cè)樣本進(jìn)行預(yù)測(cè),可以得到預(yù)測(cè)的類(lèi)別標(biāo)簽及正確率。

    第4步:性能評(píng)價(jià)。依據(jù)預(yù)測(cè)樣本測(cè)試結(jié)果,對(duì)所建立的模型進(jìn)行評(píng)價(jià)。

    利用支持向量機(jī)對(duì)訓(xùn)練樣本進(jìn)行訓(xùn)練,回判的結(jié)果與原始樣本分類(lèi)結(jié)果見(jiàn)圖4(a)。100個(gè)樣本的回判成功率為100%。利用支持向量機(jī)對(duì)預(yù)測(cè)樣本進(jìn)行預(yù)測(cè),預(yù)測(cè)結(jié)果見(jiàn)圖4(b)。預(yù)測(cè)成功46個(gè),成功率為92%,說(shuō)明利用支持向量機(jī)進(jìn)行流體識(shí)別的穩(wěn)定性較好。

    3.3支持向量機(jī)預(yù)測(cè)效果分析

    以X350井的支持向量機(jī)識(shí)別流體效果為例(圖5),從支持向量機(jī)結(jié)論中可以看出支持向量機(jī)解釋1、2小層為氣層,試氣產(chǎn)量為日產(chǎn)氣21 286 m3,日產(chǎn)水0 m3 ,試氣結(jié)果為氣層,解釋結(jié)論與試氣結(jié)論相符。支持向量機(jī)解釋5、6、7小層為氣水同層。試氣產(chǎn)量為日產(chǎn)氣54 411 m3,日產(chǎn)水7.5 m3,試氣結(jié)論為氣水同層,解釋結(jié)論與試氣結(jié)論相符。

    4結(jié)語(yǔ)

    (1)對(duì)于致密砂巖氣層,可以利用巖石的聲學(xué)特性對(duì)儲(chǔ)層流體進(jìn)行識(shí)別。縱橫波時(shí)差比、地層壓縮系數(shù)與泊松比比值、縱波彈性模量差比可以作為氣層識(shí)別的指標(biāo)。

    (2)不同彈性參數(shù)對(duì)儲(chǔ)層的含氣性指示敏感度有差異。利用彈性參數(shù)的這些屬性,建立合理的交會(huì)圖,可以對(duì)流體進(jìn)行有效識(shí)別。

    (3)不同彈性參數(shù)對(duì)流體識(shí)別的敏感度不同。選取對(duì)氣層識(shí)別敏感度較高的彈性參數(shù),引入支持向量機(jī),綜合利用這些參數(shù)對(duì)流體進(jìn)行識(shí)別,可以提高流體的識(shí)別精度。

    (4)本文是基于縱橫波測(cè)井?dāng)?shù)據(jù)進(jìn)行的研究,但是油田大部分井沒(méi)有陣列聲波測(cè)井?dāng)?shù)據(jù),這將使本文的方法應(yīng)用受到一定限制。

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