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| 1 | A new alternative approach for investigating acidization dissolution front propagation in fluid-saturated carbonate rocks显示文摘The natural phenomenon associated with the chemical dissolution of dissolvable minerals of rocks can be employed to develop innovative technology in mining and oil extracting engineering.This paper presents a new alternative approach for theoretically dealing with chemical dissolution front(CDF) propagation in fluid-saturated carbonate rocks.Note that the CDF is represented by the porosity front in this study.In this new approach,the porosity,pore-fluid velocity and acid concentration are directly used as independent variables.To illustrate how to use the present new approach,an acidization dissolution system(ADS) consisting of carbonate rocks,which belongs to one of the many general chemical dissolution systems(CDSs),is taken as an application example.When the acid dissolution capacity(ADC) number(that is defined as the ratio of the volume of the carbonate rock dissolved by an acid to that of the acid) approaches zero,the present new approach can be used to obtain analytical solutions for the stable ADS.However,if the ADC number is a nonzero finite number,then numerical solutions can be only obtained for the ADS,especially when the ADS is in an unstable state.The related theoretical results have demonstrated that:(1) When the ADS is in a stable state and in the case of the ADC number approaching zero,the present new approach is mathematically equivalent to the previous approach,in which the porosity,pore-fluid pressure and acid concentration are used as independent variables.However,when the ADS is in an unstable state,the use of the present new approach leads to a free parameter that needs to be determined by some other ways.(2) The existence of a non-step-type dissolution front within a transient region should at least satisfy that none of the ADC number,injected acid velocity and reciprocal of the dissolution reaction rate is equal to zero in the stable ADS. | ZHAO ChongBin HOBBS Bruce ORD Alison | 2017 | Science China(Technological Sciences)2017，60，8： | 6 |
| 2 | 热液矿床成矿作用研究新途径:数值模拟显示文摘热液矿床是最具有工业价值的矿床类型之一,传统矿床学研究在成岩成矿作用、成矿机制和成矿规律等方面已有丰硕成果.但仍存在一些尚无法有效回答的科学问题。近年来,数值模拟方法逐步应用于热液矿床的研究,已成为成矿过程定量研究的新手段。本文系统总结了近年来热液矿床成矿过程数值模拟研究的成果和进展,并对存在问题和发展趋势进行了分析和展望,以期进一步推动这一交叉学科领域的研究. | 袁峰 李晓晖 胡训宇 李跃 贾蔡 Ord Alison 张明明 戴文强 李贺 | 2019 | 地质科学2019，54，3： | 3 |
| 3 | 不同数值算法对模拟饱水孔隙岩石中化学溶解面非稳定性的影响(英文)显示文摘鉴于求得解析解的困难,需要采用数值方法和算法得到大量科学和工程问题的计算模拟结果。这对求解饱水孔隙岩石中化学溶解面非稳定性问题而言也不例外。由于这类非稳定性问题可具有常规解和非常规解,很有必要探讨不同数值算法对模拟饱水孔隙岩石中化学溶解面非稳定性的影响。因此,本文考虑了与常用有限元相关的2种不同数值算法。在第1种数值算法中,孔隙率、孔隙流体压力和酸液浓度被选为基本变量。在第2种数值算法中,孔隙率、孔隙流体流速和酸液浓度被选为基本变量。相关的计算模拟结果表明:(1)第1种数值算法可真实地模拟非稳定化学溶解面在化学溶解系统中传播时的演化过程;(2)第2种数值算法不能模拟非稳定化学溶解面在化学溶解系统中传播时的演化过程;(3)过度的数学微分运算是导致第2种数值算法失效的主要原因。 | 赵崇斌 Bruce HOBBS Alison ORD | 2018 | Journal of Central South University2018，25，8： | 3 |
| 4 | A unified theory for sharp dissolution front propagation inchemical dissolution of fluid-saturated porous rocks显示文摘This paper presents a unified theory to deal with when, why and how a sharp acidization dissolution front(ADF), which is represented by the porosity distribution curve, can take place in an acidization dissolution system composed of fluid-saturated porous rocks. The theory contains the following main points:(1) A reaction rate of infinity alone can lead to a sharp ADF of the Stefan-type in the acidization dissolution system. This sharp front is unstable when permeability in the downstream region is smaller than that in the upstream region.(2) For a finite reaction rate, when the acid dissolution capacity number approaches zero,the ADF can have a sharp profile of the Stefan-type either on a much smaller time scale or on a much larger time scale than the dissolution time scale. In the former case, the ADF may become unstable on a much larger time scale than the transport time scale, while in the latter case, it may become unstable if the growth rate of a small perturbation is greater than zero.(3) On the dissolution time scale, even if both the reaction rate is finite and the acid dissolution capacity number approaches zero, the profile of an ADF may not be sharp because it is in a transient state. In this case, not only can an ADF change its profile with time, but also its morphology can grow if the growth rate of a small perturbation is greater than zero. Due to the involvement of both the change rate and the growth rate of the ADF profile, it is necessary to conduct a transient linear stability analysis for determining whether or not a time-dependent ADF is stable in the acidization dissolution system. | ZHAO ChongBin HOBBS Bruce ORD Alison | 2019 | Science China(Technological Sciences)2019，62，1： | 3 |
| 5 | Transient-state instability analysis of dissolution-timescale reactive infiltration in fluid-saturated porous rocks: Purely mathematical approach显示文摘This paper deals with how the purely mathematical approach can be used to solve transient-state instability problems of dissolution-timescale reactive infiltration(DTRI) in fluid-saturated porous rocks. Three key steps involved in such an approach are:(1) to mathematically derive an analytical solution(known as the base solution or conventional solution) for a quasi-steady state problem of the dissolution timescale, which is viewed as a frozen state of the original transient-state instability problem;(2)to mathematically deduce a group of first-order perturbation partial-differential equations(PDEs) for the quasi-steady state problem;(3) to mathematically derive an analytical solution(known as the perturbation solution or unconventional solution) for this group of first-order perturbation PDEs. Because of difficulty in mathematically solving a transient-state instability problem of DTRI in general cases, only a special case, in which some nonlinear coupling between governing PDEs of the problem can be decoupled, is considered to illustrate these three key steps in this study. The related theoretical results demonstrated that the transient chemical dissolution front can become unstable in the DTRI system of large Zh numbers when the long wavelength perturbations are applied to the system. This new finding may lay the theoretical foundation for developing innovative technique to exploit shale gas resources in the deep Earth. | ZHAO ChongBin HOBBS Bruce ORD Alison | 2020 | Science China(Technological Sciences)2020，63，2： | 2 |
| 6 | 上地壳内饱水孔隙岩石中孔隙流体对流的有限元模拟综述(英文)显示文摘孔隙流体对流在生成地下深部矿产资源和油田过程中起着关键作用。因此,为了探测新的地下深部矿产资源和油田,非常有必要对驱动和控制饱水孔隙岩石中孔隙流体对流的热动力过程进行理论分析和数值模拟。根据科学的观点,上地壳内孔隙流体对流问题可被归结为一类发生在饱水孔隙介质中的热动力非稳定性问题。处理这类科学问题的关键点在于如何评价所考虑的热动力系统是否处于超临界状态。为了克服采用理论分析和实验方法在求解上地壳内孔隙流体对流问题时的局限性,有限元模拟方法已在过去二十多年中发展成为广泛使用的一种有效方法。本文的主要目的是对采用有限元模拟方法求解上地壳内孔隙流体对流问题的发展过程及应用进行综述。所考虑的应用主要涉及采用有限元模拟方法求解具有复杂几何构形和介质材料分布的大尺度地质系统中孔隙流体对流问题。尤其重要的是,本文详细地介绍了两种常用的有限元数值模拟方法,即稳态方法和瞬态方法,并对它们在模拟上地壳内孔隙流体对流问题时的优缺点进行了讨论。 | 赵崇斌 Bruce HOBBS Alison ORD | 2019 | Journal of Central South University2019，26，3： | 2 |
| 7 | 辽东半岛海城-大石桥菱镁矿矿床成因探讨显示文摘辽东半岛古元古界辽河群大石桥组三段地层中赋存有全球最大工业储量的菱镁矿矿床。在总结和整理已发表的辽东半岛晶质菱镁矿床地质和地球化学数据的基础上,本次研究进行了Mg和B同位素测试及研究工作,获得以下认识:①菱镁矿矿体呈北东东走向,产于大石桥组三段,但不同矿床的矿体厚度差异较大(30~300 m),菱镁矿矿体与顶、底板高镁白云岩之间以断层接触为主,常可见到绿泥石化板岩和碳质千枚岩产于大型菱镁矿矿体的内部韧性剪切面上,说明地层经历了强烈构造形变作用;②围岩白云岩与晶质菱镁矿矿石的地球化学特征基本一致,均表现为大离子亲石性元素(K、Rb、Ba、Sr等)亏损和氧同位素负漂移(δ^(18)O:-24.9‰~-11.0‰);③在经历构造形变和角闪岩相变质作用后,菱镁矿矿石仍继承有海相蒸发沉积岩的稳定同位素地球化学特征(δ^(13)C:-2.7‰~+1.6‰;δ^(34)S:+15.6‰~+23.7‰;δ^(26)Mg:-1.53‰~-0.49‰;δ^(11)B:+9.8‰~+13.4‰);④后期裂控型滑石具有相对较高的δ^(26)Mg值(-0.32‰~-0.15‰),发生滑石矿化的菱镁矿(δ^(11)B:+7.7‰~+8.4‰)和围岩变粒岩(δ^(11)B:+4.3‰)显示较低的δ^(11)B值,这反映了变质热液作用所引发的Mg和B同位素分馏现象。因此,辽东半岛海城-大石桥地区菱镁矿矿床镁质富集的根本原因可能为湖相沉积碳酸盐岩经准同生阶段的富镁卤水交代所致,非后期变质热液交代作用的结果。 | 胡古月 孙新胜 郑军 余旭辉 王东波 李延河 赵悦 陈翰 徐莺 ALISON Ord | 2022 | 地质学报2022，96，4： | 1 |
| 8 | Effect of water in the rheology o f experimentally deformed quartzite显示文摘 | Christie J Alison Ord | 1989 | J G R1989，94，13： | 1 |
| 9 | Two different mathematical schemes for solving chemical dissolution-front instability problems in fluid-saturated rocks显示文摘Chemical dissolution-front instability(CDFI)problems usually involve multiple temporal and spatial scales,as well as multiple processes.A key issue associated with solving a CDFI problem in a fluid-saturated rock is to mathematically establish a theoretical criterion,which can be used to judge the instability of a chemical dissolution-front(CDF)propagating in the fluidsaturated rock.This theoretical paper deals with how two different mathematical schemes can be used to precisely establish such a theoretical criterion in a purely mathematical manner,rather than in a numerical simulation manner.The main distinguishment between these two different mathematical schemes is that in the first mathematical scheme,a curved surface coordinate system is used,while in the second mathematical scheme,a planar surface coordinate system is employed.In particular,all the key mathematical deduction steps associated with using these two different mathematical schemes are described and discussed in great detail.The main theoretical outcomes of this study have demonstrated that(1)two different mathematical schemes under consideration can produce exactly the same theoretical criterion;(2)the main advantage of using the first mathematical scheme is that the interface conditions at the curved interface between the downstream and upstream regions can be easily described mathematically;(3)the main advantage of using the second mathematical scheme is that the first-order perturbation equations of the CDFI problem can be easily described in a purely mathematical manner. | ZHAO ChongBin HOBBS Bruce ORD Alison | 2022 | Science China(Technological Sciences)2022，65，1： | 1 |
| 10 | 基于地表数据及产状数据的交切断层建模方法研究显示文摘三维地质建模是地质研究的有力工具,断层的三维建模比其他地质体建模具有更大的难度,其中一个主要难题是交切断层切割关系的处理。本文以广西珊瑚矿田为例,探讨了基于地表数据和产状数据的交切断层建模方法,采用地表断层线-剖面断层轨迹-系列断层线-断层面的技术路线进行切割断层建模,采用初始断层面-断后约束条件-交切处理-约束插值的技术路线进行被切割断层的建模,并与其他建模方法的建模效果进行对比和讨论。最终形成了如下建模方法:(1)以旋转法求取部分切割断层的错开部位约束,以平移法求取完全切割断层的错开部位约束;以断层错开部位约束、地表断层线约束及断层面边界约束为控制条件,进行断层面DSI插值,实现断层错动;(2)局部法建模、分段断层线的平移连接及过度追求完全切割关系建模可能分别引起断层面延展可控性差、断面整体偏移误差及沿走向过度延伸问题,与地质事实相悖,故本文优选采用了整体法建模、顺延连接分段断层线及遵从原有切割关系的处理方法,获得了较好的建模效果。 | 赵义来 Alison Ord 汤静如 胡荣国 杨启军 汪劲草 王本达 | 2023 | 大地构造与成矿学2023，47，6： | 0 |
| 11 | Near-field performance of chemical dissolution-front instability around a circular acid-injection-well in fluid-saturated porous media显示文摘This paper investigates the near-field performance of chemical dissolution-front instability(CDFI) around a circular acidinjection-well in fluid-saturated porous media(FSPM) through using purely mathematical deductions.After the mathematical governing equations of the CDFI problem involving radially divergent flow are briefly described,both analytical base solutions and perturbation solutions for the considered problem are mathematically derived.These analytical solutions lead to the theoretical expression of the perturbation induced dimensionless growth-rate and the following two new findings.The first new finding is that the critical Peclet number of a chemical dissolution system(CDS) associated with radially divergent flow in FSPM is not only a function of the permeability ratio between the undissolved and dissolved regions as well as the dimensionless wavenumber,but also a function of the circular chemical dissolution-front location relative to the circular acid-injection-well in FSPM.The second new finding is that as the direct result of considering a nonzero radius of the circular acid-injection-well,there exits a critical closeness number,which may be used to assess where the circular chemical dissolution-front starts becoming unstable in the CDS associated with radially divergent flow.Based on these two new findings,a theoretical criterion of two parts has been established.The first part of the established theoretical criterion answers the scientific question when a circular chemical dissolution-front can become unstable,while the second part of the established theoretical criterion answers the scientific question where a circular chemical dissolution-front can become unstable.Through applying the established theoretical criterion,a long-term existing mystery why the wormhole pattern of fractal nature and the compact pattern of fingering nature are formed at different locations away from the circular acid-injection-well circumference in fluid-saturated carbonate rocks has been successfully revealed. | ZHAO ChongBin HOBBS Bruce ORD Alison | 2023 | Science China(Technological Sciences)2023，66，7： | 0 |
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