本文選題：數(shù)字巖心　切入點：數(shù)值模擬　出處：《地球物理學(xué)進展》2017年05期

【摘要】：本文以二維巖心圖像的微觀孔隙結(jié)構(gòu)特征為基礎(chǔ),采用過程法模擬實際巖心的沉積、壓實、膠結(jié)過程,并建立三維數(shù)字巖心模型.采用有限元法模擬所建巖心模型的導(dǎo)電特性,探討阿爾奇公式在微觀數(shù)字巖心領(lǐng)域的適用性,實現(xiàn)數(shù)字巖心的導(dǎo)電性差異分析.研究表明所建數(shù)字巖心模型的電阻率隨孔隙度呈指數(shù)關(guān)系變化,這與阿爾奇公式的表現(xiàn)形式一致.在三個主軸方向上,巖石系數(shù)和膠結(jié)指數(shù)值的大小和變化規(guī)律與理論結(jié)果較為接近,說明所建立的數(shù)字巖心模型在導(dǎo)電性上表現(xiàn)出各向異性,而用有限元法計算數(shù)字巖心模型導(dǎo)電性的具有較高的可靠性.
[Abstract]:Based on the microscopic pore structure characteristics of two-dimensional core images, the process method is used to simulate the deposition, compaction and cementation of actual cores, and a three-dimensional digital core model is established.The electric conductivity of the core model is simulated by finite element method, and the applicability of Archie formula in micro digital core is discussed, and the difference analysis of conductivity of digital core is realized.The results show that the resistivity of the digital core model varies exponentially with porosity, which is consistent with the expression of Archie formula.In the three principal axis directions, the magnitude and variation of rock coefficient and cementation index value are close to the theoretical results, which shows that the digital core model is anisotropic in conductivity.The calculation of conductivity of digital core model by finite element method has high reliability.
【作者單位】： 核工業(yè)二一六大隊;大慶鉆探工程測井公司;
【基金】：新疆準噶爾盆地砂巖型鈾礦資源調(diào)查評價(201609)資助
【分類號】：P618.13

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