高煤级煤储层渗透性与应力耦合模型及控制机理   总被引：2，自引：0，他引：2       下载免费PDF全文

孟召平  侯泉林 《地球物理学报》2013,56(2):667-675

煤储层应力敏感性是影响煤层气井产能的地质因素,以鄂尔多斯盆地东南缘高煤级煤储层为对象,通过煤样的应力敏感性实验和现场测试,建立了高煤级煤储层渗透性与应力之间的相关关系和模型;探讨了渗透性变化的控制机理.研究结果表明, 煤储层渗透率随应力的增加按负指数函数规律降低.在应力小于5 MPa时,煤储层渗透率随应力增加快速下降,应力敏感性最强;应力在5~10 MPa时,渗透率随应力增加而较快下降,应力敏感性较强;而当应力大于10 MPa后,渗透率随应力的增加下降速度减缓,应力敏感性减弱.与沁水盆地南部高煤级煤样实验结果对比认为,鄂尔多斯盆地东南缘山西组2煤层应力敏感性要小于沁水盆地南部山西组3煤层的应力敏感性.煤储层渗透性是在应力作用下煤储层中裂隙产生压缩(压密)变形,裂隙开度急剧减小的结果.因此在煤层气开发过程中控制排采速度,尤其是排采早期降液速度,对于防止煤储层应力敏感性,提高采收率具有实际意义.  相似文献   

MESURE DE LA PERMÉABILITÉ DES SOLS EN PLACE: UN NOUVEL APPAREIL POUR LA MÉTHODE MUNTZ UNE EXTENSION DE LA MÉTHODE PORCHET AUX SOLS HÉTÉROGÈNES     

J. COLOMBANI  J.-P. LAMAGAT  J. THIEBAUX 《水文科学杂志》2013,58(2):197-235

ABSTRACT

The authors make a general survey of the methods of measuring soil permeability in the field, looking at them from the point of view of the hydrologist.

In the first part they describe new equipment built by the ORSTOM Centre in Lome, Togo, to apply the Muntz method of vertical infiltration under constant head, equipment using a double cylinder and semi-automatic regulation of the discharge.

In the second part, the authors make a mathematical analysis of the Porchet method of horizontal infiltration in a borehole full of water: they show that results may be interpreted even with heterogeneous (multi-layered) soils and that the calculations are simplified using a computer programme.

In conclusion they deal with some results of measurements obtained by the two methods, and examine their accuracy and their correlation with the physical and hydrodynamics characteristics of the soils.  相似文献   

新疆地震烈度衰减关系模型参数拟合   总被引：1，自引：0，他引：1  

谭明  李帅  孙静  王伟  唐丽华  吴传勇 《中国地震研究》2013,27(2):261-268

By using the existing historical earthquake investigation data in Xinjiang,this paper obtained the envelope curves of isoseismal maps of 103 destructive earthquakes occurring from 1716 to 2010 after digitization of the data. The author summarized the seismic intensity attenuation laws in the Xinjiang region with the multiple regression fitting method. The intensity attenuation function of the elliptical model was provided and the fitting results in different periods and areas were compared. Finally, the intensity attenuation relationship in the Xinjiang region was obtained by the method of constraining the start and end of the attenuation curves.  相似文献   

天津近海海域隐伏断裂地震危险性评价1     

刘红艳  陈宇坤  闫成国  杨菲 《中国地震研究》2013,27(4):542-552

Based on faults surveying and research data in the Tianjin offshore areas, through studying tectonic structure, Quaternary activity, deep structure, stress and strain fields and seismicity in the Tianjin offshore areas, the activity and tectonic features of the faults are determined synthetically. Using seismo-geological data, and the historical and modern seismicity data, the frequency-magnitude relationship model normalized by 500a is established and based on the relationship between the upper limit of maximum magnitude Mu and at/b, the maximum magnitudes of the sea section of the Haihe river fault and the Haiyi fault are calculated. Then Poisson probability model is adopted and the quantitative parameters, such as the maximum magnitude, occurrence probability, recurrence cycle of the faults in the south Tianjin offshore areas in the coming 50 - 200a, are calculated.  相似文献   

A prediction model for horizontal run-out distance of landslides triggered by Wenchuan earthquake   总被引：1，自引：0，他引：1  

Changwei Yang  Jianjing Zhang  Ming Zhang 《地震工程与工程振动(英文版)》2013,12(2):201-208

The peak ground acceleration (PGA), the volume of a sliding mass V, the height of a mountain H _L and the slope angle θ of a mountain are four important parameters affecting the horizontal run-out distance of a landslide L. Correlations among them are studied statistically based on field investigations from 67 landslides triggered by the ground shaking and other factors during the Wenchuan earthquake, and then a prediction model for horizontal run-out distance L is developed in this study. This model gives due consideration to the implications of the above four parameters on the horizontal run-out distance L and the validity of the model is verified by the Donghekou and Magong Woqian landslides. At the same time, the advantages of the model are shown by comparing it with two other common prediction methods. The major findings drawn from the analyses and comparisons are: (1) an exponential relationship exists between L and log V, L and log H _L, L and log PGA separately, but a negative exponential relationship exists between L and log tanθ, which agrees with the statistical results; and (2) according to the analysis results of the relative relationship between the height of a mountain (H) and the place where the landslides occur, the probabilities at distances of 2H/3-H, H/3-2H/3, and 0-H/3 are 70.8%, 15.4%, and 13.8%, respectively, revealing that most landslides occurred at a distance of H/2-H. This prediction model can provide an effective technical support for the prevention and mitigation of landslide hazards.  相似文献   

黄渤海底栖纤毛虫分子多样性和生物地理学研究   总被引：3，自引：0，他引：3  

李桂豪  苏蕾  张倩倩  张晓黎  龚骏 《海洋学报(英文版)》2019,38(2):78-86

对中国渤海、北黄海和南黄海三个海域底栖纤毛虫的分子多样性与生物地理学进行了研究。从底栖真核微生物18S rDNA的焦磷酸测序数据中提取出隶属于纤毛门的序列，并在此基础上分析了纤毛虫群落的阿尔法多样性和贝塔多样性。结果表明，纤毛虫操作分类单元的丰富度在渤海比北黄海和南黄海都高，但夏冬两季无显著差异。在所有检测的环境因子中，水体深度与阿尔法多样性的相关性最强。就纤毛虫群落组成上看，总体上旋唇纲的序列及操作分类单元丰富度均占优势地位（占比分别为77.0%和66.5%）；旋唇纲主要由环毛亚纲以及未能进一步分类的类群组成。底栖纤毛虫群落结构在三个海域之间显著不同，但夏冬两季无显著差异。从各主要类群的相对比例来看，唯有侧口纲的序列比例在三个区域间呈现显著的不同。偏门特尔分析表明，相对于地理距离和环境因子而言，水体深度在调控底栖纤毛虫群落结构中扮演者更为重要的角色。本研究同时也发现，超过60%的操作分类单元未能被进一步分类到纲或目级水平，约45%的操作分类单元与GenBank数据库中已描述种类的序列相似度低于或等于97%，表明在近海沉积物中可能存在大量待发现的纤毛虫类群或物种。本研究发现底栖纤毛虫阿尔法多样性从北黄海到南黄海降低的趋势，这一点与之前基于形态学方法的调查结果相似。然而，测序数据显示旋唇纲是最主要类群，而形态学调查表明前口纲和核残迹纲是主要类群。本文也探讨了可能造成分子与形态学研究结果差异的一些潜在原因。  相似文献   

Land engineering and its role for sustainable agriculture in the agro-pastoral ecotone: A case study of Yulin,Shaanxi Province,China     

Wu  Wenhao  Chen  Zongfeng  Li  Yuheng  Wang  Yongsheng  Yan  Jiayu  Song  Chuanyao 《地理学报(英文版)》2019,29(5):818-830

Journal of Geographical Sciences - With global climate change, the agricultural light-temperature potential productivity in the agro-pastoral ecotone has increased. This offers a good opportunity...  相似文献   

中国地理学中的甘南研究     

赵雪雁  李巍 《地理研究》2019,38(4):743-759

区域研究是地理学的核心领域,开展区域研究需要选择既具全球意义又具区域特色,且符合国家重大战略需求的关键区域。作为“第三极”的重要组成部分,地处青藏高原东北缘的甘南高原不仅是典型的地理过渡区与生态脆弱区,也是重要的生态功能区与深度贫困区,因而成为中国地理学开展区域研究的最佳实验区之一。在阐述甘南高原地理学研究价值的基础上,从陆地地表过程与机理、土地利用/覆被变化、农户对气候变化的感知及适应、生态系统服务与生态补偿机制、农户生计及其对生态环境的影响、社会资本与区域发展、城镇化与乡村聚落、旅游发展等领域出发,系统梳理了中国地理学中的甘南研究现状,提出新时期应以更综合的多维视角开展甘南研究,重点关注甘南高原地表格局-过程集成研究、人地耦合系统演化与区域可持续发展、生态系统服务与生态补偿、可持续生计、新型城镇化、乡村发展等关键问题。  相似文献   

旅游者在场情感体验建构：理论模型与实证检验     

孙小龙  郜捷  林璧属  李磊 《热带地理》2019,39(3):430-439

以社会建构主义为视角，分析了在场阶段中游客情感体验建构的理论结构模型，识别出地方感和关系承诺等在场情感体验建构的2个直接影响因素，通过结构方程模型实证检验了该理论模型及各结构要素间的作用关系。研究表明：物理情境和社会情境是在场情感体验建构的2个概念要素，并构成了旅游者在场情感体验建构的理论结构模型。地方感与关系承诺是在场情感体验建构的直接影响要素，地方感中的地方认同与地方依赖分别从情感和功能层面正向影响旅游者的情感体验。关系承诺除对情感体验产生直接影响外，还中介了地方感对情感体验的影响。最后，提出游客情感体验提升的建议。  相似文献   

Assessing China’s human-environment relationship   总被引：3，自引：0，他引：3  

Yang  Yu  Li  Xiaoyun  Dong  Wen  Poon  Jessie P. H.  Hong  Hui  He  Ze  Liu  Yi 《地理学报(英文版)》2019,29(8):1261-1282

Journal of Geographical Sciences - China’s coupled human-environment system (CHES) is assessed here via a systems schema that emphasizes the complex interactions of components and their...  相似文献