針對(duì)深感應(yīng)測(cè)井儀6FF40的測(cè)量信息，在非均勻背景介質(zhì)中采用一種迭代方法對(duì)地層電導(dǎo)率分布進(jìn)行反演和剖面成像。該方法是基于場(chǎng)點(diǎn)在目標(biāo)區(qū)內(nèi)、外的電場(chǎng)積分方程，建立適合于6FF40的反演積分方程。在每次反演迭代過程中，用數(shù)值模式匹配法(NMM)求解6FF40的測(cè)量信息。利用沿井軸的6FF40不完備的低信息量對(duì)地層剖面進(jìn)行反演，數(shù)值模擬結(jié)果表明該迭代方法在實(shí)際工程應(yīng)用中的潛力。另外，還討論了6FF40的縱向、徑向分辨率和先驗(yàn)知識(shí)的利用等問題。
關(guān) 鍵 詞 電磁逆散射; 非線性反演方法; 深感應(yīng)測(cè)井儀; 分辨率; 先驗(yàn)知識(shí)

Abstract Reconstruction of formation conductivity distribution for 6FF40 measurement information using an inverse method was described in this paper. Based on the internal and external electrical field integral equation, the inversion equation is derived. Then, the Numerical Mode- Matching is used to solve the logging response of the 6FF40. Numerical simulations show that satisfactory inversion result of the complicated formation can be obtain from the incomplete measurement of the 6ff40. In addition, prior information, the radial and vertical resolution of the 6FF40 is also investigated.
Key words electromagnetic inverse scattering; nonlinear inverse method; 6FF40; resolution; prior information