Application of Seagull Optimization Algorithm Log Interpretation to Shale Gas Reservoir of Well H in Sichuan Basin Yuxi Block     

Yuanyuan Chen  Xiao Yang  Xiaojiang Deng  Xiaolan Wang  Qi He  Lili Cheng  Kegui Chen 《地球科学进展》1986,35(7):761-768

Due to the diversity of mineral types in shale gas reservoirs, it is difficult to establish reservoir parameter volume model by conventional log interpretation methods. The optimization log interpretation method can evaluate complex lithology reservoirs effectively, and the key is optimization algorithm. With the newly proposed seagull optimization algorithm method, we calculate the mineral and physical parameters of shale gas reservoir in Well H of Yuxi block, Sichuan Basin, and compare with the genetic algorithm and the genetic algorithm-complex hybrid algorithm. It shows that calculation results of seagull optimization algorithm optimization log interpretation match well with core analysis data, and calculation error is small, calculation speed is fast. Seagull optimization algorithm also makes up for the shortcomings of premature convergence and easy to fall into local optimization of genetic algorithm, the need for secondary optimization and slow search speed of genetic-complex hybrid algorithm. It provides a reference for the application of seagull optimization algorithm in other shale gas reservoirs regions.  相似文献   

地球自转十年尺度波动与核幔耦合的可能机制   总被引：2，自引：1，他引：2  

李金岭  傅容珊 《地球科学进展》1997,12(6):514-518

简要介绍了地球自转变化的一般规律可能的地球物理激发因素，十年尺度波动与核幔边界耦合之间的联系，以及几种可能的核幔耦合机制。强调了地震波探测手段对于获限地球内部信息的重要性，同时指出将空间大地测量，重力测量和地磁怀地球物理学方面的理论与模型研究相结合，对于最终分析和确认地球自转变化中的各种信息及其激当因素是十分重要的。  相似文献   

图们江下游跨国界经济开发区的空间极化问题研究   总被引：1，自引：0，他引：1  

陈长春 《世界地理研究》1995,(1)

本文以东北亚区域经济合作为主要背景，以区域极化发展理论为指导，对图们江下游跨国界经济开发区这一发展极核的概念进行说明，提出了该新型经济开发区赖以产生和发展的背景条件与区位条件，并对其极核的功能效应作了初步预测与展望。以对国内外积极参与图们江下游地区的合作开发提供参考依据。  相似文献   

Response surface and genetic method of deformation back analysis for high core rockfill dams     

《Computers and Geotechnics》2016

High core rockfill dams exhibit complex deformation mechanisms because of complicated geological conditions, many material partitions and severe weather conditions. When realistic parameters cannot be obtained through laboratory tests or engineering analogies because of effects of size or time, back analysis is necessary to predict deformation characteristics. This paper proposes a method of deformation back analysis based on the response surface method and genetic optimization theory. The parameters of the creep and Duncan–Chang models for the Pubugou gravelly soil core rockfill dam are sequentially calculated. Back analysis performed using this method efficiently yields more precise results than those obtained from laboratory-determined parameters.  相似文献   

HyLogger-3, a visible to shortwave and thermal infrared reflectance spectrometer system for drill core logging: functional description   总被引：1，自引：0，他引：1  

M. C. Schodlok  L. Whitbourn  J. Huntington  P. Mason  A. Green  M. Berman 《Australian Journal of Earth Sciences》2016,63(8):929-940

Australian Geological Surveys are the custodians of a major national asset in the form of historically drilled and archived drill cores of the top few kilometres of the continent acquired by government agencies and companies over many decades. The AuScope National Virtual Core Library (NVCL) component of the AuScope Earth Model comprises geological/rock samples, technology, people and database/delivery infrastructure located in six nationally distributed nodes and is aimed at extracting additional value from this asset. The technology components of the NVCL comprise an integrated suite of hardware (HyLogger-3) and software (TSG-Core) systems for the imaging and hyperspectral characterisation of drill cores in their original core trays and the interpretation of their contained oxide, carbonate, hydrous and anhydrous silicate mineralogy. The HyLogger-3 includes state-of-the-art Fourier Transform Spectrometers that continuously measure calibrated spectral reflectance from nominal 10 by 18 mm fields of view. These spectra are in turn passed through a series of automatic and semi-automatic pre-processing and mineralogical unmixing algorithms. These, along with numerous other tools in TSG-Core, output a variety of mineralogical and image products for use by scientists in many branches of the earth sciences. This paper provides a functional overview of the HyLogging hardware and software tools available in each of Australia's Geological Surveys.  相似文献   

Holocene environmental changes of the Hwajinpo Lagoon on the eastern coast of Korea     

Jong-Gwon Yum  Keiji Takemura  Takao Tokuoka  Kang-Min Yu 《Journal of Paleolimnology》2003,29(2):155-166

Lithologic and geochemical data of a core from the Hwajinpo Lagoon, located on the eastern coast of Korea, provided the evolutionary history of the lagoon related to Holocene sea-level changes of the East Sea (Sea of Japan). Grain size analysis, water content analysis, and soft X-ray analysis of core samples were used to reconstruct sedimentary environments, as were total organic carbon, C/N, S and C/S chemical records. Assemblages of mollusc and diatom remains also provided paleoenvironmental information. The reconstruction of paleoenvironments from these multi-proxy data allows the establishment of an evolutionary model of the Hwajinpo Lagoon. The environmental changes of the Hwajinpo Lagoon can be divided into seven different depositional facies: (l) Exposed basement rock; (2) Estuarine; (3) Stagnant brackish lagoon (isolated); (4) Oxic condition lagoon (organic activity); (5) Fresh water lake; (6) Oxic brackish lagoon (recent condition); (7) Prograding river delta. These environmental changes can be related to sea-level change during the Holocene. The trends of sea-level change in the Hwajinpo Lagoon from this study can be compared to those of the Japanese coastal areas located on the other side of the East Sea such as Lakes Shinji and Nakaumi.  相似文献   

Permeability of the rocks from the Kola superdeep borehole at high temperature and pressure: implication to fluid dynamics in the continental crust     

A. V. Zharikov  V. M. Vitovtova  V. M. Shmonov  A. A. Grafchikov 《Tectonophysics》2003,370(1-4):177-191

Permeability of the samples collected from the surface and from the depths of 8–11 km in the Kola SG-3 and from the depth of 3.8 in the KTB boreholes was studied at temperatures up to 600 °C and pressures up to 150 MPa. These PT correspond to in situ conditions of the deep parts of the superdeep boreholes and to the conditions of progressive and regressive metamorphism of the Kola series rocks. The experiments were carried out with fluid filtration parallel and normal to rock foliation and parallel to core axis. The temperature–permeability trend behavior depends on effective pressure and depth of sample collection. At low effective pressure, a temperature increase leads first to a permeability decrease and then to its increase. At higher effective pressure, inversions appear on all the temperature trends of the samples collected from great depths. In contrast, permeability of the samples selected at shallow depth (3.8 km) and on the surface decreases within the entire temperature range. As a rule, with flow parallel to foliation, the values of permeability are higher than with flow normal to foliation. The results of microstructure studies allow to conclude that microcrack initiation and closure, due to a competitive influence of temperature and pressure cause such permeability behavior. In the samples, there are two families of microcracks: with low aspect ratio and those with high aspect ratio. Their effect on rock permeability changes with temperature. On sample heating, the low aspect ratio microcracks close and, on the contrary, high aspect ratio ones open. The total effect is expressed by minima in the temperature–permeability trends. Permeability anisotropy increases with temperature, reaches a maximum at 200 °C and then decreases. Sample permeability decreases with different gradients at simultaneous increase of temperature and pressure, simulating in situ depth increase. Hence, the deep seat rocks can vary greatly in permeability and against the common background of permeability decrease with depth, local deep aquifers may occur. At PT of progressive metamorphism the permeability values were high enough to permit the fluid flow to penetrate the whole volume of rock massif. At PT of regressive metamorphism, the permeability values were a few decimal orders lower, so fluid flow could be concentrated in large disjunctive zones only.  相似文献   

The caldera of Volcan Fernandina: a remote sensing study of its structure and recent activity     

Scott K Rowland  Duncan C Munro 《Bulletin of Volcanology》1992,55(1-2):97-109

Air photographs taken in 1946, 1960, and 1982, together with SPOT HVR-1 images obtained in April and October of 1988, are used to characterize recent activity in and around the caldera of Fernandina Volcano, West Galapagos Islands. The eruptive and collapse events during this time span appear to be distributed in a NW-SE band across the summit and caldera. On the flanks of the volcano, subtle topographic ridges indicate that this is a long-term preferred orientation of extra-caldera activity as well (although radial and arcuate fissures are found on all sectors). The caldera is formed from the coalescence of multiple collapse features that are also distributed along a NW-SE direction, and these give the caldera its elongate and scalloped outline. The NW and SE benches consist of lavas that ponded in once-separated depressions that have been incorporated into the caldera by more recent collapse. The volume of individual eruptions within the caldera over the observed 42 years appears to be small (4x10⁶ m³) in comparison to the volumes of individual flows exposed in the caldera walls (120–150x10⁶ m³). Field observations (in 1989) of lavas exposed in the caldera walls and their cross-cutting relationships show that there have been at least three generations of calderas, and that at times each was completely filled. An interplay between a varying supply rate to the volcano and a regional stress regime is suggested to be the cause of long-term spatial and volumetric variations in activity. When supply is high, the caldera is filled in relative to collapse and dikes tend to propagate in all directions through the edifice. At other times (such as the present) supply is relatively low; eruptions are small, the caldera is far from being filled in, and dike propagation is influenced by an extra-volcano stress regime.  相似文献   

南海晚第四纪的硅藻遗体及其地质意义　Ⅱ.南海北部下大陆坡KL37剖面的硅藻组合     

蓝东兆 《台湾海峡》1994,(1)

南海下大陆坡KL37剖面共鉴定出硅藻112种和变种，隶属于45属。依据剖面硅藻种类的百分含量变化，自下而上划分两个硅藻带，其中Ⅰ带划分出8个亚带。Ⅰ1、Ⅰ3、Ⅰ5亚带和Ⅱ带的热性种平均含量高于40％；Ⅰ2、Ⅰ4、Ⅰ6、Ⅰ7、Ⅰ8亚带的热性种含量低于40％，反映了该区古温度和古地理条件的变化。并依据结节圆筛藻壳体大小的比值变化，确定出该剖面的地层年代：Ⅱ带属于全新世沉积，Ⅰ带属于晚更新世的沉积。  相似文献   

南海晚第四纪的硅藻遗体及其地质意义──Ⅳ.南海中部深海平原KL 91剖面的硅藻组合     

蓝东兆 《台湾海峡》1994,(3)

南海中部深海平原KL91剖面共鉴定出硅藻109种和变种，隶属于43属。依据剖面硅藻种类的含量变化，自下而上划分为三个硅藻带，其中Ⅰ带划分出6个亚带，Ⅱ带8个亚带。文中讨论了各硅藻带的古温度和古地理条件，并依据结节圆筛藻壳体大小比值变化，确定出该剖面的地层年代：Ⅲ带属于全新世沉积，Ⅱ带和Ⅰ2～6亚带属于晚更新世沉积，Ⅰ1亚带属于中更新世沉积。  相似文献