基于微孔充填模型的页岩储层吸附动力学特征分析   总被引：1，自引：0，他引：1       下载免费PDF全文

尹帅  丁文龙  刘建军  何建华  王濡岳  李昂  王莹莹 《高校地质学报》2014,20(4):635

微孔填充是吸附质分子在吸附剂纳微孔隙中、较高平衡压力下表现出来的一种吸附特征,以此为基础发展起来的热
力学理论在确定吸附剂微观结构及吸附性能研究方面起到了巨大推动作用。基于此,该文重点探讨了甲烷在页岩中吸附时
填充率θ、特征能量E、特征系数n、微分吸附功A 、吸附热Q、吸附焓ΔH 及吸附熵ΔS 的变化关系。结果表明：特征系数n
取1较为适当;温度升高特征能量E 值略降,3组样品E 值范围4.14~5.63 kJ/mol;随着θ 的不断增加,A ,Q ,｜ΔH ｜及｜
ΔS ｜等参数值逐渐降低,各能量参数随吸附进行而发生较为规律的变化,无突变。结果认为,热力学参数一定程度上代表
了TOC 及Ro 等参数的综合效应,受单一因素干扰性不强。将计算的Q 及ΔS 等热力学参数与四川盆地志留系龙马溪组页岩的
相应参数进行了对比,进一步表明四川盆地该套龙马溪组页岩具有巨大的页岩气勘探和开发潜力。  相似文献   

考虑河流地貌演化因素的清江隔河岩库区岸坡稳定性预测     

李景富  ;常宏  ;谭建民 《华南地质与矿产》2014,(2):162-168

根据清江中下游河流地貌演化与岸坡稳定性的响应关系,将河流地貌演化因子作为岸坡稳定性评价指标,采用层次分析与信息量评价模型相结合的方法,通过地理信息系统实现了清江隔河岩库区的岸坡稳定性定量预测,其预测结果与现实情况比较吻合。研究表明该方法是一种行之有效的岸坡稳定性预测方法,以及河流地貌演化对岸坡稳定性预测具有显著作用。  相似文献   

The late Mesozoic–Cenozoic tectonic evolution of the South China Sea: A petrologic perspective     

《Journal of Asian Earth Sciences》2014

This paper presents a review of available petrological, geochonological and geochemical data for late Mesozoic to Recent igneous rocks in the South China Sea (SCS) and adjacent regions and a discussion of their petrogeneses and tectonic implications. The integration of these data with available geophysical and other geologic information led to the following tectono-magmatic model for the evolution of the SCS region. The geochemical characteristics of late Mesozoic granitic rocks in the Pearl River Mouth Basin (PRMB), micro-blocks in the SCS, the offshore continental shelf and Dalat zone in southern Vietnam, and the Schwaner Mountains in West Kalimantan, Borneo indicate that these are mainly I-type granites plus a small amount of S-type granites in the PRMB. These granitoids were formed in a continental arc tectonic setting, consistent with the ideas proposed by Holloway (1982) and Taylor and Hayes, 1980, Taylor and Hayes, 1983, that there existed an Andean-type volcanic arc during later Mesozoic era in the SCS region. The geochonological and geochemical characteristics of the volcanics indicate an early period of bimodal volcanism (60–43 Ma or 32 Ma) at the northern margin of the SCS, followed by a period of relatively passive style volcanism during Cenozoic seafloor spreading (37 or 30–16 Ma) within the SCS, and post-spreading volcanism (tholeiitic series at 17–8 Ma, followed by alkali series from 8 Ma to present) in the entire SCS region. The geodynamic setting of the earlier volcanics was an extensional regime, which resulted from the collision between India and Eurasian plates since the earliest Cenozoic, and that of the post-spreading volcanics may be related to mantle plume magmatism in Hainan Island. In addition, the nascent Hainan plume may have played a significant role in the extension along the northern margin and seafloor spreading in the SCS.  相似文献   

Thermal and compositional stratification of the inner core     

《Comptes Rendus Geoscience》2014,346(5-6):119-129

The improvements of the knowledge of the seismic structure of the inner core and the complexities thereby revealed ask for a dynamical origin. Sub-solidus convection was one of the early suggestions to explain the seismic anisotropy, but it requires an unstable density gradient either from thermal or compositional origin, or from both. Temperature and composition profiles in the inner core are computed using a unidimensional model of core evolution including diffusion in the inner core and fractional crystallisation at the inner core boundary (ICB). The thermal conductivity of the core has been recently revised upwardly and, moreover, found to increase with depth. Values of the heat flow across the core mantle boundary (CMB) sufficient to maintain convection in the whole outer core are not sufficient to make the temperature in the inner core super-isentropic and therefore prone to thermal instability. An unreasonably high CMB heat flow is necessary to this end. The compositional stratification results from a competition of the increase of the concentration of light elements in the outer core with inner core growth, which makes the inner core concentration also increase, and of the decrease of the liquidus, which makes the partition coefficient decrease as well as the concentration of light elements in the solid. While the latter (destabilizing) effect dominates at small inner core sizes, the former takes over for a large inner core. The turnover point is encountered for an inner core about half its current size in the case of S, but much larger for the case of O. The combined thermal and compositional buoyancy is stabilizing and solid-state convection in the inner core appears unlikely, unless an early double-diffusive instability can set in.  相似文献   

南海北部深水区荔湾凹陷构造演化及其石油地质意义   总被引：1，自引：0，他引：1  

纪沫  张功成  赵志刚  杨海长  曾清波 《地质通报》2014,33(5):723-732

荔湾凹陷北与白云凹陷相邻,南与双峰盆地(南海西北次海盆)相接,发育于洋陆过渡边界,具有独特的结构构造特征。选取荔湾凹陷为研究对象,在3D地震资料解释的基础上,以断裂特征分析厘定凹陷性质、构造古地貌恢复解析凹陷结构,进而指出古地貌恢复和构造演化对油气勘探的影响。研究获得三方面的创新性认识:①荔湾凹陷为洋陆过渡壳上发育的断坳,断坳作用占主导地位;②32Ma的底辟作用将荔湾凹陷改造为"四洼三凸"的构造格局,恩平组沉积期凹陷北部是一个连通的洼陷;③恩平组沉积期连通洼陷的古地貌有利于三角洲(烃源岩)的发育,背斜型圈闭的定型受控于32Ma的底辟作用,是荔湾凹陷油气勘探的有利目标。  相似文献   

川南地区龙马溪组页岩有机质特征及其对页岩含气量的影响     

周宝刚  李贤庆  张吉振  董泽亮  李媛媛  宋雷  热汗古-丽牙库甫  张明扬  郭曼 《中国煤炭地质》2014,(10):27-32

四川盆地南部地区广泛发育下古生界寒武系、志留系等多套海相页岩层,其中龙马溪组是该区页岩气勘探开发的重点目标层。根据钻井岩心资料,通过有机碳、热解、碳同位素、等温吸附等地球化学实验分析,对川南地区下志留统龙马溪组页岩的有机质特征及其对页岩含气量的影响进行了研究。结果表明,川南地区龙马溪组页岩有机碳含量较高(平均1.53%),有机质类型较好(Ⅰ型和Ⅱ1型),热演化程度高(Ro为1.94%~2.42%),且页岩含气量较高(平均1.85m3/t)。页岩有机质特征是影响页岩含气量的主要因素,有机质丰度、有机质类型和热演化程度三者共同决定了川南地区龙马溪组页岩的含气量。  相似文献   

Causes of geothermal fields and characteristics of ground temperature fields in China     

MAO Xiao-ping  LI Ke-wen  WANG Xin-wei 《地下水科学与工程》2014,7(1):15-28

There are many arguments on energy sources and main controlling factors of geothermal fields, so a systematic study on the distribution of ground temperature fields shall be necessary. In this paper the thermal conduction forward method of geothermal field is used to simulate cooling rate of abnormal heat sources and heat transfer of the paleo-uplift model. Combined with a large number of geothermal field exploration cases and oil exploration well temperature curves of domestic and foreign, the following conclusions are drawn: (1) According to the magmatic activity time, the magmatism activities are divided into two categories: Magma active areas (activity time < 500 000 years) and weak/magma inactive areas (activity time > 500 000 years). The latter has a fast cooling rate (the cooling time of the magma pocket buried around 10 km is less than 200 000 years) after it has intruded into the shallow layer and it has no direct contribution to modern geothermal fields; (2) China belongs to a weak/magma inactive area such as Tengchong region and Qinghai-Tibet region because the chronological data of these regions show that its magma activity time is more than 500 000 years; (3) The temperature of most geothermal fields can be obviously divided into three segments in the vertical direction: A high geothermal gradient segment (Segment H) at the surface, then a low geothermal gradient segment (Segment L) at a secondary depth, and finally a lower temperature segment (Segment D) at a deeper depth. The temperature isoline presents a mirror reflection relation on the temperature profile, indicating that geothermal field is dominated by heat conduction, rather than having an abnormally high temperature “heat source” to provide heat; (4) Near-surface (0-5 km) materials’ lateral heterogeneity caused by tectonic movement shall probably be the main controlling factor of ground temperature fields.  相似文献   

Sedimentary stylolite networks and connectivity in limestone: Large-scale field observations and implications for structure evolution     

《Journal of Structural Geology》2014

Stylolites are rough surfaces, formed by localized rock dissolution, and prevalent in carbonates and other sedimentary rocks. Their impact on porosity and permeability, and capacity to accommodate compactive strain, are well documented. This paper presents a meso-scale field study on sedimentary stylolites in carbonates, characterizing large-scale distributions of stylolites, including measurements conducted on longer than kilometer-long stylolites. Our field study suggests that on large scales connections between stylolites become important. Since connectivity, and also lack of connectivity, are expected to play a significant role in strain accommodation and hydraulic rock properties, we suggest that large-scale analysis may require a new characterization scheme for “stylolite populations”, based on their connectivity. We therefore divide sedimentary stylolite populations into three end-member types, which are correlated with the three possibilities for percolation of such systems: isolated stylolites (with zero percolation/connectivity), long-parallel stylolites (with 2-dimensional percolation/connectivity), and interconnected stylolite networks (with 3-dimensional percolation/connectivity). New statistical parameters and measures are devised and used to quantitatively characterize the different population types. Schematic mechanistic models are then offered to explain the evolution of the three end-member connectivity-classes. In addition we discuss the effect on fluid flow of the different population types.  相似文献   

塔里木盆地西南部麦盖提斜坡构造演化过程的 记录——生长地层及生长不整合   总被引：2，自引：0，他引：2  

吕明  汤良杰  岳勇 《地质论评》2014,60(1):91-101

根据塔里木盆地西南部麦盖提斜坡生长地层的发育模式,并结合不整合类型及发育特征的变化规律,探讨了麦盖提斜坡的构造演化过程。认为在早古生代时期,麦盖提斜坡为一北倾的斜坡,构造高点位于斜坡南部;晚古生代,麦盖提斜坡的构造演化过程具有明显的分段性,斜坡西段主要的构造演化时期始于早石炭世,并持续至早二叠世,构造高点迁移至斜坡中部,呈现出"中间高、两头低"的古构造特征;而斜坡东段的主要构造演化时期推迟至晚二叠世。新生代,麦盖提斜坡已反转为南倾的斜坡,构造高点已迁移至斜坡北部,斜坡东段从前中新世开始进入构造演化时期,而西段则推迟至中新世,且东段的构造活动强度要大于西段。  相似文献   

斑岩-浅成低温热液型Cu-Au矿H2O-Cl-S流体性质和演化方式对成矿的制约     

胡庆成  闫浩  吴春明 《地质论评》2014,60(3):601-610

斑岩—浅成低温热液型Cu—Au成矿流体最具代表性的是H2O—Cl—S流体。流体的性质强烈控制着Cu、Au的成矿行为,包括溶解性、迁移形式和气—液分配。流体的氧逸度和流体中Cl、S物种相对含量决定金属在流体中的溶解形式,高氧逸度的高温高盐度流体中Cu、Au主要和Cl络合,S-3也可能是促进Au溶解的重要S物种形式。而过量的S有利于Cu、Au等元素以含S离子络合物进入液相流体,与含S中性络合物配分进入气相流体并迁移Au至浅成低温热液环境形成矿床。岩浆需要经历充分的分异,出溶成分和性质有利于金属迁移的流体,形成高品位的斑岩型Cu、Au矿体;上覆叠加浅成低温热液型Au矿体可能需要初始的成矿流体状态进入NaCl—H2O的超临界区、有效的演化方式、良好的流体缓冲环境和有利的Au沉淀场所。相分离和流体—流体反应是沉淀斑岩—浅成低温热液型Cu—Au矿体最重要的流体演化方式。气相流体具有独特的流体性质和演化方式,可能成为十分重要的成矿流体。  相似文献