本文選題：含泥含鈣致密砂巖 + 有效介質(zhì)對稱導(dǎo)電理論�。� 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：致密砂巖儲層具有低孔低滲,泥質(zhì)、鈣質(zhì)含量高,孔隙結(jié)構(gòu)復(fù)雜的特征,這些特征使得儲層的導(dǎo)電規(guī)律相比于常規(guī)儲層更加的復(fù)雜,現(xiàn)有的飽和度模型不能同時描述泥質(zhì)、鈣質(zhì)及孔隙結(jié)構(gòu)對致密砂巖導(dǎo)電規(guī)律的影響,為致密砂巖儲層飽和度評價增加了難度。本文首先選取了15塊致密砂巖儲層巖心,對15塊巖心進(jìn)行了巖電實驗、粒度分析、碳酸鹽巖分析、壓汞實驗及核磁共振實驗。運(yùn)用15塊巖心的實驗數(shù)據(jù)資料深入研究了致密砂巖的導(dǎo)電規(guī)律,并分析了影響儲層導(dǎo)電規(guī)律的三個主要因素—泥質(zhì)、鈣質(zhì)膠結(jié)及孔隙結(jié)構(gòu),得出當(dāng)巖石的泥質(zhì)含量增大、鈣質(zhì)含量減小、孔隙結(jié)構(gòu)變好時,巖石的導(dǎo)電性隨之變好。基于致密砂巖的儲層特征及其導(dǎo)電規(guī)律的實驗研究結(jié)果,考慮致密砂巖導(dǎo)電性的三種主要影響因素,利用孔隙幾何形態(tài)導(dǎo)電理論和連通導(dǎo)電方程能夠描述復(fù)雜孔隙結(jié)構(gòu)變化對巖石導(dǎo)電性的影響,而有效介質(zhì)對稱導(dǎo)電理論能夠描述泥質(zhì)、鈣質(zhì)膠結(jié)對巖石導(dǎo)電性的影響這一優(yōu)點,將有效介質(zhì)對稱導(dǎo)電理論分別與孔隙幾何形態(tài)導(dǎo)電理論以及連通導(dǎo)電方程結(jié)合,綜合建立了兩種能夠適用于致密砂巖儲層的導(dǎo)電模型。采用單參數(shù)變化的方法,對兩種致密砂巖導(dǎo)電模型進(jìn)行了理論驗證,表明兩種致密砂巖導(dǎo)電模型均能夠正確的描述泥質(zhì)、鈣質(zhì)膠結(jié)以及孔隙結(jié)構(gòu)變化對致密砂巖導(dǎo)電規(guī)律的影響,并且兩種模型預(yù)測的理論規(guī)律均與實驗規(guī)律相符合。使用15塊致密砂巖巖心實驗測量數(shù)據(jù),運(yùn)用最優(yōu)化技術(shù)對兩種模型進(jìn)行了實驗驗證,表明建立的兩種致密砂巖導(dǎo)電模型均能夠描述致密砂巖的導(dǎo)電規(guī)律。經(jīng)過與1口密閉取心井飽和度的對比,建立的兩種致密砂巖導(dǎo)電模型計算的含水飽和度平均絕對誤差分別為5.8%和5.7%;利用本文建立的兩種模型處理解釋了致密砂巖儲層的實際井資料,通過對比處理解釋結(jié)果與試油結(jié)果,發(fā)現(xiàn)二者相吻合,綜合以上結(jié)果表明本文所建立的兩種致密砂巖導(dǎo)電模型能夠很好地適用于含泥含鈣孔隙結(jié)構(gòu)復(fù)雜的致密砂巖儲層測井解釋評價。
[Abstract]:The tight sandstone reservoir has the characteristics of low porosity and low permeability, high content of calcareous, high content of calcium and complex pore structure. These characteristics make the conductivity law of reservoir more complex than that of conventional reservoir, and the existing saturation model can not describe the muddy material at the same time.The influence of calcium and pore structure on the conductivity of tight sandstone makes it difficult to evaluate the saturation of tight sandstone reservoir.In this paper, 15 cores of tight sandstone reservoir are selected, and the experiments of rock electricity, particle size analysis, carbonate rock analysis, mercury injection and nuclear magnetic resonance are carried out in 15 cores.Based on the experimental data of 15 cores, the electrical conductivity of tight sandstone is studied in depth, and the three main factors that affect the conductivity of reservoir are analyzed, which are muddy, calcareous cementation and pore structure. It is concluded that when the shale content of the rock increases,With the decrease of calcium content and the improvement of pore structure, the conductivity of rock becomes better.Based on the experimental results of reservoir characteristics and electrical conductivity of tight sandstone, three main factors affecting the conductivity of tight sandstone are considered.The effect of complex pore structure changes on the conductivity of rock can be described by using the theory of conductivity of pore geometry and the connected conductive equation, while the effect of shale and calcium cementation on the conductivity of rock can be described by the theory of symmetric conductivity of effective medium.By combining the effective medium symmetric conductivity theory with the pore geometry shape conduction theory and the connected conductive equation, two conductive models suitable for tight sandstone reservoirs are established.By using the method of single parameter variation, two kinds of conductive models of tight sandstone are theoretically verified. It is shown that the two models can describe the shale correctly.The effects of calcareous cementation and pore structure changes on the conductivity of tight sandstone are discussed. The theoretical laws predicted by the two models are in agreement with the experimental ones.The experimental data of 15 tight sandstone cores were used to verify the two models by using optimization technique. The results show that both of the two models can describe the conductivity law of dense sandstone.After a comparison with the saturation of a closed coring well,The average absolute error of water saturation calculated by the two conductive models of tight sandstone is 5.8% and 5.7% respectively, and the actual well data of tight sandstone reservoir are interpreted by the two models established in this paper.By comparing the interpretation results with the oil test results, it is found that the two agree with each other.The above results show that the two conductive models developed in this paper can be well applied to the logging interpretation and evaluation of tight sandstone reservoirs with complex pore structure with mud and calcium.
【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】：2017
【分類號】：P618.13

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