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由中国地球物理学会地球物理勘探委员会、中国石油学会石油物探分会举办的“波动方程专题讨论会”于一九八○年十二月十二日至十六日在南京举行。参加会议的有来自全国各地的有关高等院校、研究所、石油和地质等部门共29个单位,代表共54人。 这次会议的主题是研究石油地震勘探中弹性波传播的正反演问题,讨论的重点是有限元方法在波动理论中的应用以及有关地震偏移和地震模拟问题。会上宣读了22篇论文,基本上反映出我国现阶段石油物探中波动理论的应用和研究水平,也展示了经过几年的努力,我国在这方面的工作已逐步接近 相似文献
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由中国地球物理学会委托中国科学院测量与地球物理研究所筹备召开的全国第一次地球重力场及固体潮学术讨论会于1982年10月6—11日在武昌举行。出席会议的有全国测绘、地震、石油、地质、海洋、中国科学院及高等院校等66个单位,100名代表。我国地球物理学界老前辈中国地球物理学会副理事长方俊教授出席了会议并宣读了论文。 相似文献
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测井地质学在我国的发展历程及其启示 总被引：3，自引：3，他引：0
油气勘探开发目标的复杂化、隐蔽性,使测井评价技术面临挑战,深化测井地质学的理论及应用,是测井技术应对挑战的途径之一.论文在尝试分析我国测井地质学的发展动力和存在问题的基础上,认为测井地质学在我国的发展大致经历了3个发展阶段:测井地质学的引入和初步探索阶段;国内学者对测井地质学的多方位研究、探索阶段以及测井新技术为主导的测井地质学发展阶段.通过深入总结各阶段测井地质学的发展水平和成果推广效果,论文进一步探讨测井地质学在我国的应用现状与不足,指出阻碍该学科发展的突出矛盾在于学术研究的过于分化.对于我国测井地质学的发展方向,认为地质家和测井分析家的深入合作,是该学科走向完善的唯一途径. 相似文献
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中国地球物理学会第一次地壳与上地幔物理学术讨论会于1982年12月31日至1983年1月5日在南宁市举行。参加会议的有石油、地质、冶金、铁道、海洋、地震、中国科学院及高等院校等47个单位,约110名代表。 会上宣读了83篇论文,内容广泛,涉及人工源地震的地壳与上地幔深部探测,天然地震、大地电磁测深,重力、地磁、古地磁、地热、遥感,板块构造与地球动力学等方面研究的进展,从理论、方法、分析解 相似文献
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神经网络在石油测井解释中的应用综述 总被引：2，自引：0，他引：2
常规测井解释往往通过"四性关系"研究建立储层参数解释模型,将测井信息转化成地质参数开展储层评价,但对于复杂岩性储层、低渗低阻等储层而言,将测井信息转化为储层参数及利用测井曲线开展储层评价往往存在多解性.作为一种非线性数学方法,神经网络具有多信息融合、综合预测的功能,在解决一些复杂、非线性问题领域展示了强大的生命力.将神经网络引入石油测井解释中,综合利用多种测井信息开展岩性、物性及含油性分析,可有效提高石油测井解释的精度和效率;利用神经网络技术开展流体性质识别和储层裂缝研究可有效破解此类世界性难题.为此,本文对神经网络技术在石油测井解释中的应用进行了综述,并对应用中应注意的事项进行分析,最后进行了应用展望. 相似文献
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《地球物理学进展》1991,(3)
中国地球物理学会第七届年会于1991年10月8—12日在北京召开。参加会议的代表来自科学院、高等院校、地矿、石油、地震、能源、冶金、有色金属等部门的113个单位,共343人。其中青年占36%,中年占60%,老年占4%。共收到论文425篇,会议期间宣读270余篇,《中国地球物理学会年刊(1991)》刊入251篇论文摘要,164篇论文题目。中国科学院地球物理研究所献给大会一册论文摘要集,3幅成果图(1.中国及邻域布格重力异常图;2.中国及邻域空间重力异常图;3.中国及邻域卫星重力异常图)。同济大学马在田教授、中南工业大学何继善教授、国家地震局陈颙研究员分别以“石油物探技术的进展”、“金属矿物探的进展”和“地震预报的进展”为题作了大会发言,会议 相似文献
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阪神·淡路大震灾后 ,日本着手对原有的地震观测体制作彻底改革 ,多项全国性配置地震计的计划同时开始启动。地震引起的地面晃动的程度不尽相同 ,无感微小地震引发的晃动仅有 0 .0 0 1 μm,频率为1 0 Hz;巨大地震引起的地面晃动的幅度高达 2～ 3 m,周期也有几十秒。虽说都称之为地震计 ,但由于地震动的振幅和频率涉及的范围太大 ,所以应针对观测对象选用不同类型的地震计。下面介绍不同类型的观测网。1 强震观测网 ( K- NET)无论大地有多大的晃动都能将其准确记录下来的地震计称之为强震计。它构造坚实 ,信号明确 ,通常设置在地表 ,对了… 相似文献
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Michael O. Garcia Diane Hanano Ashton Flinders Dominique Weis Garrett Ito Mark D. Kurz 《Bulletin of Volcanology》2012,74(6):1445-1463
The size, shape, and magmatic history of the most recently discovered shield volcano in the Hawaiian Islands, Mahukona, have been controversial. Mahukona corresponds to what was thought to be a gap in the paired sequence (Loa and Kea trends) of younger Hawaiian volcanoes (<4?Ma). Here, we present the results of marine expeditions to Mahukona where new bathymetry, sidescan sonar, gravity data, and lava samples were collected to address these controversies. Modeling of bathymetric and gravity data indicate that Mahukona is one of the smallest Hawaiian volcanoes (～6,000?km3) and that its magmatic system was not focused in a long-lived central reservoir like most other Hawaiian volcanoes. This lack of a long-lived magmatic reservoir is reflected by the absence of a central residual gravity high and the random distribution of cones on Mahukona Volcano. Our reconstructed subsidence history for Mahukona suggests it grew to at least ～270?m below sea level but probably did not form an island. New 40Ar–39Ar plateau ages range from 350 to 654?ka providing temporal constraints for Mahukona’s post-shield and shield stages of volcanism, which ended prematurely. Mahukona post-shield lavas have high 3He/4He ratios (16–21?Ra), which have not been observed in post-shield lavas from other Hawaiian volcanoes. Lava compositions range widely at Mahukona, including Pb isotopic values that straddle the boundary between Kea and Loa sequences of volcanoes. The compositional diversity of Mahukona lavas may be related to its relatively small size (less extensive melting) and the absence of a central magma reservoir where magmas would have been homogenized. 相似文献
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In this study, we have checked the location and focal depth of the Yecheng earthquake (m b = 6.0, maximum intensity VII) of February 14, 1980. The result shows that this is an intermediate event with a focal depth of 90 km. The microepicenter is located at 36. 4°N, 76, 9°E, while the macroepicenter is at 37.3°N, 76.9°E, 90 km to the north of the microepicenter. This is the first destructive intermediate event in China which led to a damage as severe as of intensity VII. The focal mechanism of the event is determined to be of thrust type. Combined with the analysis of seismological and geological data in surrounding area, the possible relation between the event and plate movement has been discussed. The result in this paper indicates that in some particular place, the destructive effect of intermediate event should be considered in seismic hazard assessment. 相似文献
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In this study, we experimentally established the relationship between physical properties, vitrinite reflectance, and microstructure of coal, Taiyuan Formation, Qinshui Basin, China using representative coal samples collected from three different mines via the rock mechanics testing system (MTS). We analyzed the organic macerals, vitrinite reflectance, and microstructure of 11 coal samples using petrography and scanning electron microscopy (SEM). The experimental results suggest that (1) the elastic parameters can be described by linear equations, (2) both P-and S-wave velocities display anisotropy, (3) the anisotropy negatively correlates with vitrinite reflectance, and (4) the acoustic velocities and Young’s modulus are negatively correlated with the volume of micropores. The derived empirical equations can be used in the forward modeling and seismic inversion of physical properties of coal for improving the coal-bed methane (CBM) reservoir characterization. 相似文献
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Sun, climate, hunger, and mass migration 总被引：9，自引：1，他引：8
Kenneth J. Hsu 《中国科学D辑(英文版)》1998,41(5):449-472
Paleoclimatic studies indicate four epochs of global cooling during the last 4 000 years, i. e. during the few centuries before
and after 2000 BC, 800 BC, 400 AD, and 1 600 AD; the quasiperiodicity corresponds to cyclic variation of solar activity. Global
temperature changes influenced regional precipitation patterns: Northern Europe was wetter while the middle- and low-latitude
lands were more arid during colder epochs. Both sets of cold climatical conditions were unfavorable for agricultural production.
Historical records show that large demographic movements in history took place because of crop failures and mass starvation,
rather than escaping from war zones. The “wandering” of the Germanic tribes during the first two or three centuries of the
Christian Era is one example. Whereas the accelerated release of carbon dioxide from the burning of fossil fuels is ultimately
to cause global warming, historical evidence indicates, however, that global warming has been on the whole a blessing to mankind.
Global cooling, on the other hand, has curtailed agricultural production and has led to famines and mass migrations of people.
Perhaps the most important task at the present is not so much computer-modelling of greenhouse effect on global climate, but
water-management and agricultural researches to insure food-supply for an everincreasing world population. 相似文献
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Abu Sayeed Shafiuddin Ahmed Mohammad Belal Hossain Saad Mohammad Omar Faruque Babu Moshiur Rahman Jun Sun Mohammad Shafiqul Islam Sarker 《国际泥沙研究》2022,37(1):83-96
Sediment samples from the Gomti River basin were investigated to determine and evaluate trace metal concentrations,their biological effect,and potential ecological and human health risks for adults and children.The mean concentrations of trace metals were organized in the descending order of mercury(Hg)(0.08 mg/kg)>chromium(Cr)(0.06 mg/kg)>lead(Pb)(0.05 mg/kg)>arsenic(As)(0.02 mg/kg)>cadmium(Cd)(0.01 mg/kg).The current study illustrated that metals were attributed to the area from natural sources and different anthropogenic sources especially from industries.However,the concentration levels were lower than the sediment quality guidelines(SQGs)based on the effect-range classifications of threshold effect concentration(TEC)and probable effect concentration(PEC).Therefore,the concentration of the elements showed no adverse biological effects on aquatic organisms.The evaluated potential ecological risk index also revealed the low toxicity to the aquatic environment.Moreover,the applied sediment quality indices,geo-accumulation index(Igeo),contamination factor(CF),and contamination severity index(CSI)suggested that the contamination levels of the elements were in the acceptable range,and the contamination had not notably impacted on the sediment quality.The risk index(HI)concerning age groups was significantly less than the threshold limit of 1 indicating that the contamination had no non-carcinogenic risk effect.The total carcinogenic risk(TCR)was less than a risk value of 1×104.Hence,the current study suggests that immediate remediation is not required due to an absence of alarming conditions in the study area.Proper monitoring of the attribution of the metal elements should be done for the betterment of human and environmental health。 相似文献