鄂尔多斯盆地天环坳陷北段奥陶系烃源岩特征及成熟演化史     

黄志刚  任战利  陈玉林  郑庆荣 《地质学报》2022,96(11):3967-3976

为研究天环坳陷北段下古生界天然气成藏规律,利用探井资料和有机地球化学方法,评价了天环坳陷北段奥陶系烃源岩特征并恢复其成熟演化史。天环坳陷北段奥陶系乌拉力克组和克里摩里组烃源岩有机碳含量和生烃潜量相对较高,烃源岩有机质丰度以中等—好为主,少部分为差烃源岩;三道坎组和桌子山组烃源岩以差为主。干酪根组分鉴定表明,天环坳陷北段奥陶系烃源岩主要为Ⅱ₁～Ⅰ型干酪根,热演化程度高,处于生干气阶段。成熟演化史模拟显示,古生代—中生代早期地温梯度低,地层埋藏浅,烃源岩成熟演化程度低。燕山期,由于构造热事件,地温梯度迅速升高,早白垩世烃源岩经历的最高温度超过200℃,达到生气高峰期,早白垩世是油气成藏的主要时期。早白垩世之后,鄂尔多斯盆地整体抬升,地温梯度减小,生烃作用停止。  相似文献   

OC4漂浮式风电平台的水弹性响应及波浪载荷研究     

林琳  陈明杨  杨鹏  张洁  徐浩然  张凯 《海洋工程》2024,(2):56-67

漂浮式风电平台在波浪中的摇晃运动会导致塔架根部产生很大的弯矩,极大地威胁平台结构安全。同时流体的附连水质量效应对平台塔架结构的动响应有着较为显著的影响,因此充分考虑这种流固耦合效应有利于更加准确地评估平台塔架的结构动响应。采用三维频域线性水弹性方法计算塔架在流体作用下的结构共振频率特征以及各阶模态振动的主坐标响应特性,然后通过弹性模态叠加法获得塔架的弯矩载荷。并结合概率学手段,预报了短期极限海况下塔架弯曲载荷响应,为新一代漂浮式风电平台结构安全性评估和方案设计提供了技术支撑。  相似文献   

An internal-external optimized convolutional neural network for arbitrary orientated object detection from optical remote sensing images     

Sihang Zhang  Zhenfeng Shao  Xiao Huang  Linze Bai  Jiaming Wang 《地球空间信息科学学报》2021,24(4):654-665

Due to the bird's eye view of remote sensing sensors, the orientational information of an object is a key factor that has to be considered in object detection. ...  相似文献   

Quasi-waveform seismic tomography of crustal structures in the capital circle region of China     

Xueyuan HUANG  Dinghui YANG  Ping TONG  Yuan GAO  Yutao SHI  Hao WU 《中国科学:地球科学(英文版)》2021,64(1):110-126

Seismic tomography is one of the main tools to explore the interior of the earth.In this study,the quasi-waveform seismic tomographic method is used for the first time to reveal the crustal structures in the capital region of China.3-D highresolution V_P,V_S and the Poisson’s ratio models are generated by inverting 29839 direct P-and 29972 direct S-wave traveltimes selected from 3231 local earthquakes.The results reveal strong crustal heterogeneities.The velocity anomalies at shallow depths are well consistent with surface geologic structures.The relatively low-velocity anomaly layer in the middle crust may be the result of multiple phases of tectonic activity.Earthquakes generally occurred on the boundaries of high-and low-velocity and Poisson’s ratio anomalies.There are obvious low-velocity anomalies below the hypocenters of the Tangshan earthquake and the historical Sanhe-Pinggu earthquake,implying the existence of fluids.The similar velocity structures around the hypocenters of the two earthquakes indicate that the occurrences of the two earthquakes may be related to the same mechanism.The highresolution velocity models provide important observational constraints on the small-scale heterogeneities and dynamic mechanism of the crust in the capital region of China.  相似文献   

Modeling 3D thermal fracture propagation by transient cooling using virtual multidimensional internal bonds          下载免费PDF全文

K. Huang  A. Ghassemi 《国际地质力学数值与分析法杂志》2016,40(17):2293-2311

Thermal fracturing can play an important role in development of unconventional petroleum and geothermal resources. Thermal fractures can result from the nonlinear deformation of the rock in response to thermal stress related to cold water injection as well as heating. Before the rock reaches the final failure stage, material softening and bulk modulus degradation can cause changes in the thermo‐mechanical properties of the solid. In order to capture this aspect of the rock fracture, a virtual multidimensional internal bond‐based thermo‐mechanical model is derived to track elastic, softening, and the failure stages of the rock in response to the temporal changes of its temperature field. The variations in thermo‐mechanical properties of the rock are derived from a nonlinear constitutive model. To represent the thermo‐mechanical behavior of pre‐existing fractures, the element partition method is employed. Using the model, numerical simulation of 3D thermal fracture propagation in brittle rock is carried out. Results of numerical simulations provide evidence of model verification and illustrate nonlinear thermal response and fracture development in rock under uniform cooling. In addition, fracture coalescence in a cluster of fractures under thermal stress is illustrated, and the process of thermal fracturing from a wellbore is captured. Results underscore the importance of thermal stress in reservoir stimulation and show the effectiveness of the model to predict 3D thermal fracturing. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

Modeling three‐dimensional hydraulic fracture propagation using virtual multidimensional internal bonds     

K. Huang  Z. Zhang  Ahmad Ghassemi 《国际地质力学数值与分析法杂志》2013,37(13):2021-2038

Propagation of fractures, especially those emanating from wellbores and closed natural fractures, often involves Mode I and Mode II, and at times Mode III, posing significant challenges to its numerical simulation. When an embedded inclined fracture is subjected to compression, the fracture edge is constrained by the surrounding materials so that its true propagation pattern cannot be simulated by 2D models. In this article, a virtual multidimensional internal bond (VMIB) model is presented to simulate three‐dimensional (3D) fracture propagation. The VMIB model bridges the processes of macro fracture and micro bond rupture. The macro 3D constitutive relation in VMIB is derived from the 1D bond in the micro scale and is implemented in a 3D finite element method. To represent the contact and friction between fracture surfaces, a 3D element partition method is employed. The model is applied to simulate fracture propagation and coalescence in typical laboratory experiments and is used to analyze the propagation of an embedded fracture. Simulation results for single and multiple fractures illustrate 3D features of the tensile and compressive fracture propagation, especially the propagation of a Mode III fracture. The results match well with the experimental observation, suggesting that the presented method can capture the main features of 3D fracture propagation and coalescence. Moreover, by developing an algorithm for applying pressure on the fracture surfaces, propagation of a natural fracture is also simulated. The result illustrates an interesting and important phenomenon of Mode III fracture propagation, namely the fracture front segmentation. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

Seasonal temperature extremes in Potsdam   总被引：1，自引：1，他引：0  

Zbigniew W. Kundzewicz  Shaochun Huang 《Acta Geophysica》2010,58(6):1115-1133

The awareness of global warming is well established and results from the observations made on thousands of stations. This paper complements the large-scale results by examining a long time-series of high-quality temperature data from the Secular Meteorological Station in Potsdam, where observation records over the last 117 years, i.e., from January 1893 are available. Tendencies of change in seasonal temperature-related climate extremes are demonstrated. “Cold” extremes have become less frequent and less severe than in the past, while “warm” extremes have become more frequent and more severe. Moreover, the interval of the occurrence of frost has been decreasing, while the interval of the occurrence of hot days has been increasing. However, many changes are not statistically significant, since the variability of temperature indices at the Potsdam station has been very strong.  相似文献   

Modeling the effects of riparian planting strategies on stream temperature: Increasing suitable habitat for endangered Formosan Landlocked Salmon in Shei‐Pa National Park,Taiwan     

T. Y. Lee  J. C. Huang  L. Y. Liao  C. S. Tzeng  C. H. Yang  P. K. Kalita  C. P. Tung 《水文研究》2012,26(24):3635-3644

Reducing or stabilizing the stream temperature of ChiChiaWan Creek is a crucial work for Formosan Landlocked Salmon because ChiChiaWan Creek is the only one habitat for this endangered species. Planting trees in the riparian zone would be one of the alternatives. The purpose of this study was to evaluate the effects of several planting strategies on daily maximum stream temperature along the river. The results showed the effective vegetative shading angles should be more than 50° along ChiChiaWan Creek to reduce the direct solar radiation heating effectively. Upstream planting with 70° vegetative shading angle could be the most effective way among all the scenarios. However, this planting strategy could not improve the worst situations in summer because of the large solar elevation angles. The upstream planting in ChiChiaWan Creek was strongly recommended because the canopies could be easier to extend to totally cover the narrow width of river producing the most effective shades. Practicing the upstream planting with 90° vegetative shading angle can increase more than 1 km long suitable habitats for the endangered Salmon in summer. Alternatively, the west‐side planting scenario was the second effective way for temperature reduction. Our result provided a useful suggestion for the authorities in charge of saving the Formosan Landlocked Salmon, particularly under the stress of global warming. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

利用U—1000型激光拉曼探针测定流体包裹体气体成分的研究     

黄伟林  薛理辉等 《矿物学报》1990,10(1):1-7,T001

本文利用U－1000型激光拉曼探针成功地测量出单个流体包裹体中H2S、CH4、CO2气体成分，并讨论了包裹体中这些气体的拉曼谱峰位移与包裹体内压的关系，分析了影响激光拉曼探针定量测定包裹体气相成分的取面积和拉曼定量因子因素。  相似文献   

The vascular flora of the Qomolangma-Xixabangma region,Tibet     

Rongfu Huang 《GeoJournal》1988,17(4):625-633

According to the classification and statistics of the specimens collected in the Xixabangma-Qomolangma region there are a total of 1624 species of vascular plants (136 families, 573 genera). Based on the statistics of the 573 genera of vascular plants, 14 distribution types are derived (Cosmopolitans, pantropical, tropical asian-american, palaeotropical, indo-malayan, north-temperate, east-asian-north-american disjunctions, temperate asian, central asian, tethys elements, endemic etc.). The origin of the flora of the area under consideration is polygenetic. There is no endemic family, but there are 14 endemic genera and 240 endemic species. The majority of the endemic species are derived from large and polytypic genera. The group of endemic species and varieties show that the flora of Xixabangma-Qomolangma is young and under violent floristic differentiation.  相似文献