【摘要】：重慶及其周緣地區(qū)下古生界下寒武統(tǒng)筇竹寺組、上奧陶統(tǒng)五峰組—下志留統(tǒng)龍馬溪組頁巖具備頁巖氣形成的有利地質(zhì)條件,是四川盆地主要的氣源巖之一。探索該區(qū)頁巖核磁共振的有效實驗方法,可以為頁巖氣的勘探開發(fā)提供技術(shù)支持;研究該區(qū)頁巖的孔隙度、滲透率等物理性質(zhì),并輔以理論分析、巖石物理實驗與分析,可以更好的分析評價該區(qū)目標儲層頁巖的開發(fā)潛力。本文基于頁巖核磁共振原理,選取研究區(qū)代表性樣品,開展實驗研究。首先,設(shè)置不同實驗參數(shù)開展頁巖核磁共振實驗,分析實驗參數(shù)對核磁共振測量結(jié)果的影響,研究核磁共振實驗有效參數(shù)的選取方法。然后,對研究區(qū)頁巖進行核磁共振測量,定量計算頁巖的孔隙度、滲透率等物性參數(shù),并結(jié)合常規(guī)巖心分析資料,通過數(shù)值擬合確定核磁滲透率模型的待定系數(shù)C。最后,構(gòu)建頁巖核磁共振T2譜分布,將研究區(qū)頁巖進行分型分類,定性評價頁巖孔隙結(jié)構(gòu)、孔徑分布等特征,建立研究區(qū)頁巖核磁共振解釋方法。本文通過頁巖樣品核磁共振實驗,確定以下參數(shù):回波間隔TE=0.11ms,回波個數(shù)NECH=4096,采樣次數(shù)NS=8,等待時間TW=6000ms適合研究區(qū)頁巖核磁共振測試;根據(jù)頁巖巖樣孔徑分布中峰值點T2值的分布及各類孔隙的含量百分比,將研究區(qū)頁巖分為3型:過渡孔—微孔型、過渡孔—中孔型、中孔—過渡孔型;根據(jù)各型頁巖不同層位巖樣橫向弛豫時間T2譜形態(tài)的差異,將各型頁巖T2譜分為3類:單峰態(tài)T2譜、雙峰態(tài)T2譜、三峰態(tài)T2譜。分析研究發(fā)現(xiàn):研究區(qū)下志留統(tǒng)龍馬溪組(LMX)頁巖孔滲條件最好,下寒武統(tǒng)筇竹寺組(QZS)次之,奧陶統(tǒng)五峰組(WF)較差。通過實驗及數(shù)值擬合確定了研究區(qū)頁巖樣品核磁共振T2截止值為2ms,核磁滲透率模型待定系數(shù)C=30.03,且Coates模型在研究區(qū)有更好的適用性。頁巖樣品核磁共振孔隙度與密度、滲透率與峰值點T2值均有較好的相關(guān)性,可建立計算模型,便于快速獲取研究區(qū)頁巖孔隙度、滲透率等物性參數(shù)。
[Abstract]:The shales of Lower Cambrian Qiongzhusi formation and Upper Ordovician Wufeng formation and Lower Silurian Longmaxi formation in Chongqing and its surrounding areas have favorable geological conditions for shale gas formation and are one of the main gas source rocks in Sichuan Basin. Exploring the effective experimental method of shale nuclear magnetic resonance in this area can provide technical support for the exploration and development of shale gas, study the physical properties of shale porosity and permeability, and be supplemented by theoretical analysis, rock physics experiment and analysis. It can better analyze and evaluate the development potential of the target reservoir shale in this area. Based on the theory of shale nuclear magnetic resonance (NMR), the representative samples of the study area were selected and the experimental study was carried out. Firstly, the shale nuclear magnetic resonance (NMR) experiment was carried out with different experimental parameters. The influence of the experimental parameters on the nuclear magnetic resonance (NMR) measurement results was analyzed, and the method of selecting the effective parameters of the NMR experiment was studied. Then, the nuclear magnetic resonance (NMR) measurements were carried out to quantitatively calculate the porosity and permeability of shale, and combined with the conventional core analysis data, the undetermined coefficient C of the model was determined by numerical fitting. Finally, the NMR T2 spectrum distribution of shale was constructed, the shale in the study area was classified, the pore structure and pore size distribution of shale were evaluated qualitatively, and the interpretation method of nuclear magnetic resonance was established. In this paper, the following parameters are determined by nuclear magnetic resonance (NMR) experiments of shale samples: the echo interval is 0.11ms, the number of echo is NECH 4096, the sampling number is NS8, and the waiting time TW=6000ms is suitable for shale nuclear magnetic resonance testing in the study area. According to the distribution of T _ 2 value of peak point and percentage of various pores in the pore distribution of shale samples, the shale in the study area is divided into three types: transitional pore-micropore type, transitional pore-mesoporous type, mesoporous-transitional pore type; According to the difference of transverse relaxation time T 2 spectra of different types of shale samples, the T 2 spectra of different types of shale are classified into three types: single peak T 2, double peak T 2 and three peak T 2. It is found that the (LMX) shale porosity and permeability conditions are the best in the lower Silurian Longmaxi formation, followed by the lower Cambrian Qiongzhusi formation (QZS) and the Ordovician Wufeng formation. The T _ 2 cut-off value of nuclear magnetic resonance (NMR) for shale samples in the study area is determined to be 2msand the undetermined coefficient C _ (30.03) of the nuclear magnetic permeability model is determined by experiments and numerical fitting. The Coates model is more suitable for the study area. The nuclear magnetic resonance porosity and density, permeability and peak T _ 2 value of shale samples are all well correlated, so the calculation model can be established to obtain the physical parameters of shale porosity and permeability in the study area quickly.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.13

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