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松辽盆地东部地区推覆构造与油气勘探趋势 总被引：8，自引：0，他引：8
本文通过重力、航磁、大地电磁测深和地面石油地质调查等工作,将虎林盆地划分了七个二级构造单元,确定了虎林盆地存在一个大型推覆构造,其基本特征不仅表现在1000～5000Ωm的高阻层覆盖在3～20Ωm的低阻层之上,而且在宏观与微观的构造变形与变位方面也有显示。说明虎林盆地确实经历了塑性流变和剪切滑脱构造事件,即经历了拉张、推覆碰撞、第三纪盆地形成三个阶段;并且指出由于推覆构造的存在,便可有望在推覆体之下发现油气田,扩大油气勘探新领域。 相似文献
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中国科学院地质所石油构造组在1988—1989年间,在青海石油管理局石油勘探开发研究院的合作与支持下,在阿尔金山南部斜坡区发现一个大推覆带。现已根据地质、大地电磁测深、地震等物探资料,结合邻区钻井资料明确了这个推覆带的基底形态、掩覆地层、构造变形以及发展演化。该推覆带分布在采石岭到咸水泉一线,东西两端都有延伸。推覆带,由北向南冲掩,倾角变化较大,但一般小于20°。已知推掩距离约18km,前缘推冲带最宽达0.5km。 相似文献
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论述了瞬变电磁剖面测量及测深在上覆低电阻层的条件下,在水平层状铅锌金矿床上的地质效果,对取得的经验及资料推断解释中的问题作了说明. 相似文献
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通过钻探、重磁和频率电磁测深资料的综合研究后认为,隐伏在新生界之下的阜(阳)凤(台)逆冲推覆构造体系由外来系统、主滑面和原地系统等单元组成。外来系统为典型的叠瓦扇构造;主滑面具断坡—断坪特征;原地系统中有可能存在更深层次的滑脱。阜凤推覆构造是豫准煤田南缘逆冲断裂带的重要组成部分。在推覆体下,蕴藏着储量可观的石炭二叠纪煤系。 相似文献
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电偶源瞬变电磁测深研究(一)——基本原理 总被引：2，自引：0，他引：2
从分析瞬变电磁测深激发波形的频谱出发,进而证明瞬变电磁测深与频率电磁测深场分量间的关系,最后论述了探测地质结构的物理原理。 相似文献
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雪峰隆起带西缘是否存在大的推覆构造,是80年代以来地质学者热烈争论的一个问题。本文依据丰富的地面地质资料和深部物探资料,从地面地质构造特征、早古代沉积相带展布、深部物探资料(主要是可控震源地震资料和大地电磁测深资料)的对比分析、雪峰隆起带所处的大地构造位置及其演化过程等几个方面,论证了该区并不存在大的推覆构造,雪峰隆起带不会是外来的推覆体。 相似文献
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萍—乐坳陷及其基底存在不同层次的滑脱,并由宜春盆地滑覆系、九岭南缘逆冲推覆系和乐平逆冲推覆系组成一个规模宏大的复杂推覆系。推覆系内部存在三种不同的结构类型:基底逆冲叠瓦式、盆地盖层对滑式和盆岭对冲式。盖层区逆冲断层扩展的主导因素是盖层底部不整合面的拆离,后继作用是多层次滑脱和随后的切层逆冲,扩展顺序由盆内指向盆缘,即内序列。推覆作用主要导源于东秦岭中生代的陆内俯冲,分三个推覆期:印支期、燕山早期和喜马拉雅期。 相似文献
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磁偶源频率测深法是一种有效的地球物理勘探方法。多年来,人们对这种方法的正演理论和反演解释进行了研究。文中利用快速汉克尔数值滤波算法计算了层状介质上直立磁偶极子的电磁场响应以及频率测深视电阻率的振幅响应,这种计算方法与常用的数值积分算法相比,具有计算速度快、精度高等特点。同时详细地讨论了磁偶源频率测深的特点及视电阻率理论曲线的特征。 相似文献
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Frank Radstake 《Hydrogeology Journal》1992,1(2):50-56
The Service National des Ressources en Eau (SNRE) of the Ministry of Agriculture of Haiti, in cooperation with the UNDTCD, carried out a geophysical investigation in the Northern Plain of Haiti. It included a reinterpretation of the available resistivity soundings and the realization of eight additional soundings and 11 electromagnetic profiles. The mathematical interpretation of the soundings permitted the determination of the true resistivity of different lithologies present in the area and the mapping of the thickness of the alluvial aquifer. The results of the five electromagnetic resistivity profiles in the Trou du Nord area are presented, with a total lenght of 17.4 km. They show distinctive resistivity anomalies, which are assumed to represent buried river channels filled with coarse sands and gravels. One of the anomaly zones was explored in more detail and shows clearly lateral resistivity differences at greater depths. The data interpretations have been checked through response calculations of geoelectrical layer models. 相似文献
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Zhamaletdinov A. A. Velikhov E. P. Shevtsov A. N. Skorokhodov A. A. Kolobov V. V. Ivonin V. V. Kolesnikov V. E. 《Doklady Earth Sciences》2019,486(1):575-579
Doklady Earth Sciences - This paper describes the Murman-2018 experiment on remote electromagnetic sounding in combination with frequency and audio magnetotelluric soundings. The experimental... 相似文献
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Integrated geoelectrical survey for groundwater and shallow subsurface evaluation: case study at Siliyin spring, El-Fayoum, Egypt 总被引：3，自引：1，他引：2
Mohamed Metwaly Gad El-Qady Usama Massoud Abeer El-Kenawy Jun Matsushima Nasser Al-Arifi 《International Journal of Earth Sciences》2010,99(6):1427-1436
Siliyin spring is one of the many natural fresh water springs in the Western Desert of Egypt. It is located at the central
part of El-Fayoum Delta, which is a potential place for urban developments and touristic activities. Integrated geoelectrical
survey was conducted to facilitate mapping the groundwater resources and the shallow subsurface structures in the area. Twenty-eight
transient electromagnetic (TEM) soundings, three vertical electrical soundings (VES) and three electrical resistivity tomography
(ERT) profiles were carried out around the Siliyin spring location. The dense cultivation, the rugged topography and the existence
of infra structure in the area hindered acquiring more data. The TEM data were inverted jointly with the VES and ERT, and
constrained by available geological information. Based on the inversion results, a set of geoelectrical cross-sections have
been constructed. The shallow sand to sandy clay layer that forms the shallow aquifer has been completely mapped underneath
and around the spring area. Flowing of water from the Siliyin spring is interconnected with the lateral lithological changes
from clay to sand soil. Exploration of the extension of Siliyin spring zone is recommended. The interpretation emphasizes
the importance of integrating the geoelectrical survey with the available geological information to obtain useful, cheap and
fast lithological and structural subsurface information. 相似文献
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Mohamed Ahmed Khalil Abbas Mohamed Abbas Fernando M. Santos Usama Masoud Hany Salah 《Arabian Journal of Geosciences》2013,6(8):3093-3101
The present study is an approach to detect the sea/freshwater interface in Sidi Abdel Rahman area, northwestern coast of Egypt using both vertical electrical sounding and time domain electromagnetic. The measured vertical electrical soundings are interpreted in 1D and 2D manner. The 1D inversion is carried out using the commercial software (RESIST), whereas 2D resistivity nonlinear iterative inversion scheme based on the finite element technique and regularization method was used. The time domain electromagnetic stations are interpreted using Temixxl-4 software by Interpex Ltd. To have the advantages of the vertical electrical sounding in shallow depths and time domain electromagnetic in deep depths, a joint inversion algorithm is applied for the electric profile and the nearby electromagnetic profile. Very low resistivity values have been observed near the coast as well as a considerable salt/fresh water interface. The tip-top portion of the interface lies approximately 1,000 m from the shore line. 相似文献
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Locating lagoon seepage with radar and electromagnetic survey 总被引：1，自引：0，他引：1
Ground-penetrating radar and electromagnetic terrain conductivity (EM) surveys were investigated as possible techniques for determining the presence and extent of groundwater contamination from leachate plumes emanating from animal waste lagoons. Preliminary data suggest that the electromagnetic technique offers the greater range of applicability. Data obtained from EM soundings of three different animal waste lagoons are used to illustrate the usefulness of this technique. 相似文献
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《Russian Geology and Geophysics》2014,55(1):89-97
We analyze the results of a mathematical simulation of pulsed electromagnetic fields in geologic media with dipping near-vertical boundaries as well as interpretations within approximating block models and a layered homogeneous conducting model. We consider the possibilities and limitations of these approaches to the inversion of data from pulsed soundings of actual geologic media. 相似文献
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Abera Tessema Haile Mengistu Emmanuel Chirenje Tamiru A. Abiye Molla B. Demlie 《Hydrogeology Journal》2012,20(2):351-368
Airborne magnetic data and Landsat imagery, as well as time-domain electromagnetic soundings, were used to assess groundwater potential of the region around the town of Mafikeng in North West Province, South Africa. Lineaments were extracted based on on-screen digital data derived from magnetic and Landsat 7 imagery. The relationship between lineament-intersection density and borehole yield was assessed using statistical analysis. The results were discussed with respect to factors that determine the groundwater potential of the area. Correlation between lineament-intersection frequency and borehole yield is 60?C65% in the south and southeastern parts, and 45?C50% within 5?C30?km radius of Mafikeng. The eastern and western parts of the study area are characterized by weak or no correlation. Areas that correspond to high correlation between lineament-intersection frequency and borehole yield suggest the significance of cross-cutting structures in controlling groundwater potential zones, while results that suggest low or no correlation represent the influence of other factors. The overall results demonstrate that the combined analysis of airborne magnetic data, satellite imagery, borehole yield and ground-based time-domain electromagnetic soundings provide the best approach for groundwater assessment within the hard rock and carbonate terrains of the study area. 相似文献
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A. A. Zhamaletdinov E. P. Velikhov A. N. Shevtsov V. V. Kolobov V. E. Kolesnikov A. A. Skorokhodov T. G. Korotkova V. V. Ivonin P. A. Ryazantsev M. A. Birulya 《Doklady Earth Sciences》2017,474(2):641-645
This paper addresses the Kovdor-2015 Experiment involving frequency electromagnetic soundings of the Archaean basement of the Earth’s crust in the southwestern part of the Kola Peninsula. Eleven soundings were carried out using two transmitting arrangements, 85 km apart. Each arrangement consisted of two mutually orthogonal grounded electric dipoles of 1.5 km long. The distances between the source and the receiver were 25 and 50 km. Interpretation of the results took into account the influence of displacement currents and static distortions. It is found that there is an intermediate conductive layer of the dilatancy–diffusion nature (DD layer) with a longitudinal conductivity of about one siemens at depths ranging from 1.5–2 to 5–7 km. The results are interpreted in the terms of geodynamics. 相似文献