儲層注氣引起地表變形的全場建模與分析
發(fā)布時間：2018-11-18 15:11
【摘要】：全球范圍內(nèi)化石能源的大規(guī)模開發(fā)利用,造成二氧化碳排放量的大幅度增加,地球大氣層中二氧化碳濃度的升高開始影響自然生態(tài)系統(tǒng),對人類的生存和發(fā)展構(gòu)成危害。二氧化碳地質(zhì)封存作為一項減少二氧化碳凈排放量的極具潛力的技術(shù)措施,受到國內(nèi)外廣泛的關(guān)注。儲層注氣工程區(qū)別于普通的巖土工程,具有深埋、隱蔽的特點,且一旦封閉失效,形成滲漏途徑,輕則浪費資源能源,重則危害環(huán)境,傷及人畜性命,因此,對儲層動態(tài)的(reservoir behavior)監(jiān)控和預(yù)測尤為重要。模擬和分析儲層注氣引起的地表變形,可用于儲層工程災(zāi)害預(yù)測、指導(dǎo)設(shè)計監(jiān)測巖層變形的傾斜儀安置陣列、校準(zhǔn)現(xiàn)有地質(zhì)模型等,是有效監(jiān)測地表變形、實施施工過程歷史擬合、反演與預(yù)測深部儲層動態(tài)的基礎(chǔ)。為對儲層注氣工程引起地表變形的全場建模分析提供可行的方法和思路,共做出如下方面的成果：(1)通過閱讀和分析國內(nèi)外相關(guān)學(xué)者的文獻(xiàn)著作,綜述了國內(nèi)外二氧化碳埋存研究的發(fā)展現(xiàn)狀及未來研究趨勢,總結(jié)了儲層工程遠(yuǎn)場巖石力學(xué)效應(yīng)研究領(lǐng)域的研究內(nèi)容,亟待解決的問題和存在的難點。(2)將儲層注氣引起地表變形這一深部儲層在初始地應(yīng)力場約束下由注氣過程引起近遠(yuǎn)場二次彈性力學(xué)效應(yīng)問題抽象簡化為概念模型、全場二維模型或全場三維模型,逐漸增加簡化模型對實際工程問題的近似能力,利用解析解推導(dǎo),邊界元程序求解、FLAC-3D軟件模擬等手段,得到針對這一問題的系統(tǒng)的全場建模分析的結(jié)果及規(guī)律。為建立該類問題實際工程尺度的全場建模分析方法奠定了基礎(chǔ)。(3)針對儲層注氣引起地表變形的全場建模和分析問題的特點,自主研發(fā)了用戶可控的大規(guī)模網(wǎng)格化離散源程序。運行該程序即可將Eclipse儲層模型自動轉(zhuǎn)換并延伸成FLAC3D全場地質(zhì)模型,將Eclipse儲層流動分析結(jié)果轉(zhuǎn)換使其為FLAC3D巖石力學(xué)分析所用,從而實現(xiàn)復(fù)雜地質(zhì)結(jié)構(gòu)儲層流動與近遠(yuǎn)場巖石力學(xué)效應(yīng)的單向耦合。(4)基于自主研發(fā)的源程序,模擬了某大型咸水層二氧化碳封存項目注氣一定時間后的地表變形。研究了常規(guī)模擬流程遇到的逼近能力局限性等特殊問題,揭示了其原因并給出了解決方案。探討了全場地質(zhì)模型中包含的儲層下覆巖層的厚度,即深度方向建模范圍,對地表變形模擬精度的影響。
[Abstract]:The large-scale exploitation and utilization of fossil energy in the world has caused a large increase in carbon dioxide emissions, and the increase of carbon dioxide concentration in the earth's atmosphere has begun to affect the natural ecosystem, which is harmful to the survival and development of human beings. Geological sequestration of carbon dioxide, as a potential technical measure to reduce net carbon dioxide emissions, has attracted wide attention at home and abroad. Reservoir gas injection engineering is different from ordinary geotechnical engineering. It has the characteristics of deep burial and concealment, and once the seal fails, it forms a leakage path, which wastes resources and energy resources, harms the environment and endangers human and animal lives. (reservoir behavior) monitoring and prediction of reservoir performance is particularly important. Simulation and analysis of surface deformation caused by gas injection can be used to predict reservoir engineering disasters, guide the design of tiltmeter array for monitoring rock deformation, calibrate existing geological models, etc., are effective in monitoring surface deformation. The foundation of inversion and prediction of deep reservoir dynamic is carried out by historical fitting of construction process. In order to provide feasible methods and ideas for full-field modeling and analysis of surface deformation caused by reservoir gas injection engineering, the following achievements have been made: (1) by reading and analyzing the literature works of domestic and foreign scholars, The present situation and future research trend of carbon dioxide sequestration at home and abroad are summarized, and the research contents in the field of far-field rock mechanics effect of reservoir engineering are summarized. (2) Abstract the concept model of the deep reservoir under the constraint of initial in-situ stress field, which is caused by the gas injection process to cause the near far-field secondary elastic effect. The approximate ability of the simplified model to the practical engineering problems is gradually increased by using the full-field two-dimensional model or the full-field three-dimensional model, using analytical solution derivation, boundary element program solving, FLAC-3D software simulation and so on. The results and rules of full-field modeling and analysis for this problem are obtained. It lays a foundation for the establishment of full-field modeling and analysis method for the practical engineering scale of this kind of problems. (3) aiming at the characteristics of full-field modeling and analysis of surface deformation caused by gas injection, A large scale gridded discrete source program is developed. The Eclipse reservoir model can be automatically transformed into a FLAC3D full-field geological model by running the program, and the result of Eclipse reservoir flow analysis can be converted to be used in FLAC3D rock mechanics analysis. Thus the unidirectional coupling of reservoir flow and near-far-field rock mechanics effect is realized. (4) based on the self-developed source program, the surface deformation of a large salt water layer carbon dioxide sequestration project after injecting gas for a certain time is simulated. This paper studies some special problems such as the limitation of approximation ability encountered by the conventional simulation process, reveals the reasons and gives the solutions. This paper discusses the influence of the thickness of overlying strata in the full-field geological model, that is, the depth direction modeling range, on the accuracy of surface deformation simulation.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE357.7
本文編號：2340390
[Abstract]:The large-scale exploitation and utilization of fossil energy in the world has caused a large increase in carbon dioxide emissions, and the increase of carbon dioxide concentration in the earth's atmosphere has begun to affect the natural ecosystem, which is harmful to the survival and development of human beings. Geological sequestration of carbon dioxide, as a potential technical measure to reduce net carbon dioxide emissions, has attracted wide attention at home and abroad. Reservoir gas injection engineering is different from ordinary geotechnical engineering. It has the characteristics of deep burial and concealment, and once the seal fails, it forms a leakage path, which wastes resources and energy resources, harms the environment and endangers human and animal lives. (reservoir behavior) monitoring and prediction of reservoir performance is particularly important. Simulation and analysis of surface deformation caused by gas injection can be used to predict reservoir engineering disasters, guide the design of tiltmeter array for monitoring rock deformation, calibrate existing geological models, etc., are effective in monitoring surface deformation. The foundation of inversion and prediction of deep reservoir dynamic is carried out by historical fitting of construction process. In order to provide feasible methods and ideas for full-field modeling and analysis of surface deformation caused by reservoir gas injection engineering, the following achievements have been made: (1) by reading and analyzing the literature works of domestic and foreign scholars, The present situation and future research trend of carbon dioxide sequestration at home and abroad are summarized, and the research contents in the field of far-field rock mechanics effect of reservoir engineering are summarized. (2) Abstract the concept model of the deep reservoir under the constraint of initial in-situ stress field, which is caused by the gas injection process to cause the near far-field secondary elastic effect. The approximate ability of the simplified model to the practical engineering problems is gradually increased by using the full-field two-dimensional model or the full-field three-dimensional model, using analytical solution derivation, boundary element program solving, FLAC-3D software simulation and so on. The results and rules of full-field modeling and analysis for this problem are obtained. It lays a foundation for the establishment of full-field modeling and analysis method for the practical engineering scale of this kind of problems. (3) aiming at the characteristics of full-field modeling and analysis of surface deformation caused by gas injection, A large scale gridded discrete source program is developed. The Eclipse reservoir model can be automatically transformed into a FLAC3D full-field geological model by running the program, and the result of Eclipse reservoir flow analysis can be converted to be used in FLAC3D rock mechanics analysis. Thus the unidirectional coupling of reservoir flow and near-far-field rock mechanics effect is realized. (4) based on the self-developed source program, the surface deformation of a large salt water layer carbon dioxide sequestration project after injecting gas for a certain time is simulated. This paper studies some special problems such as the limitation of approximation ability encountered by the conventional simulation process, reveals the reasons and gives the solutions. This paper discusses the influence of the thickness of overlying strata in the full-field geological model, that is, the depth direction modeling range, on the accuracy of surface deformation simulation.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE357.7
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，本文編號：2340390
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