The Extension of the Gravity Net to The Unsurveyed Areas of The Earth: Geophysical Methods

2013 ◽  
pp. 75-77
Author(s):  
W. A. Heiskanen
Keyword(s):  
Geophysical Methods ◽  
The Earth

Pengantar Geofisika

2020 ◽  
Author(s):  
Muhammad Syukri ◽  
Keyword(s):  
Geophysical Methods ◽  
Magnetic Method ◽  
Scientific Concept ◽  
Physical Parameters ◽  
Study Program ◽  
The Earth ◽  
Engineering Study ◽  
Close Relationship ◽  
Study Programs ◽  
The Relationship

This introductory book on Geophysics was created to support teaching materials for basic subjects in the Geophysical Engineering Study Program, Physics Study Program, and related Study Programs in addition to other major books. This book introduces the basics of the earth and the structure of the earth, as well as the layers of the earth globally. Furthermore, it is also shown how the relationship between geophysics and other related branches of science within the sphere of geoscience. So that each scientific concept is clearly distinguished, although sometimes there is a very close relationship. In another section, various geophysical methods are described, starting from the basic theory, working principles, approaches and applications. All physical parameters that are applied from each discussion such as seismic method, geoelectric method and IP, gravity method, georadar method, and magnetic method. The hope is that this book can provide benefits for readers and enthusiasts of geoscience.

GEOPHYSICAL METHODS ADAPTED TO HIGHWAY ENGINEERING PROBLEMS

Geophysics ◽  
1952 ◽  
Vol 17 (3) ◽  
pp. 505-530 ◽  
Author(s):  
R. Woodward Moore
Keyword(s):  
Seismic Refraction ◽  
Geophysical Methods ◽  
Engineering Structures ◽  
Highway Engineering ◽  
Earth Resistivity ◽  
The Earth ◽  
Ore Bodies ◽  
Geophysical Surveys ◽  
Engineering Problems ◽  
Test Use

Of the several geophysical methods used in exploration for oil and useful ore bodies, the earth‐resistivity and seismic‐refraction tests have been found to be the most adaptable to the shallow tests generally required in highway construction work. Of these, the earth‐resistivity test is the faster and has a wider range of application to highway problems than does the seismic test. Use of both methods of tests in subsurface explorations for engineering structures is expanding. The paper cites a growing need for a more thorough subsurface investigation of all engineering structure sites and gives examples of field data obtained by the Bureau of Public Roads when making preliminary geophysical surveys of proposed highway locations or structure sites. The economic aspects and the advantages and limitations of the two methods of test are discussed with particular reference to their application to highway engineering problems.

Cementation exponent as a geometric factor for the elastic properties of granular rocks

Geophysics ◽  
2020 ◽  
Vol 85 (6) ◽  
pp. MR341-MR349
Author(s):  
Tongcheng Han ◽  
Zhoutuo Wei ◽  
Li-Yun Fu
Keyword(s):  
Elastic Properties ◽  
Geophysical Methods ◽  
Effective Medium ◽  
Geometric Factor ◽  
Rock Properties ◽  
Modeling Approaches ◽  
The Earth ◽  
Elastic Rock ◽  
Effective Medium Models ◽  
Electromagnetic Surveys

A geometric factor properly describing the microstructure of a rock is compulsory for effective medium models to accurately predict the elastic and electrical rock properties, which, in turn, are of great importance for interpreting data acquired by seismic and electromagnetic surveys, two of the most important geophysical methods for understanding the earth. Despite the applications of cementation exponent for the successful modeling of electrical rock properties, however, there has been no demonstration of cementation exponent as the geometric factor for the elastic rock properties. We have developed a workflow to model the elastic properties of clean and normal granular rocks through the combination of effective medium modeling approaches using cementation exponent as the geometric factor. Based on the dedicated modeling approaches, we find that cementation exponent can be adequately used as a geometric factor for the elastic properties of granular rocks. Further results highlight the effects of cementation exponent on the elastic and joint elastic-electrical properties of granular rocks. The results illustrate the promise of cementation exponent as a geometric link for the joint elastic-electrical modeling to better characterize the earth through integrated seismic and electromagnetic surveys.

scholarly journals Sparsity-based compressive reservoir characterization and modeling by applying ILS-DLA sparse approximation with LARS on DisPat-generated MPS models using seismic, well log, and reservoir data

2016 ◽  
Author(s):  
Mohammad Hosseini ◽  
Mohammad Ali Riahi
Keyword(s):  
Image Processing ◽  
Internal Structure ◽  
Sparse Coding ◽  
Geophysical Methods ◽  
Sparse Approximation ◽  
Distance Functions ◽  
Multiple Point ◽  
Image Modeling ◽  
Training Images ◽  
The Earth

Abstract. In the earth sciences, there is only one single true reality for a property of any dimension whereas many realization models of the reality might exist. In other words, a set of interpreted multiplicities of an unknown property can be found but only one unique fact exists and the task is to return from the multiplicities to the uniqueness of the reality. Such an objective is mathematically provided by sparse approximation methods. The term "approximation" indicate the sufficiency of an interpretation that is close enough to the true mode, i.e. reality. In geosciences, the multiplicities are provided by multiple-point statistical methods. Realistic modeling of the earth interior demands for more sophisticated geostatistical methods based on true available images, i.e. the training images. Among available MPS methods, the DisPat algorithm is a distance-based MPS method which generate appealing realizations for stationary and nonstationary training images by classifying the patterns based on distance functions using kernel methods. Advances in nonstationary image modeling is an advantage of the DisPat method. Realizations generated by the MPS methods form the training set for the sparse approximation. Sparse approximation is consisted of two steps, i.e. sparse coding and dictionary update, which are alternately used to optimize the trained dictionary. Model selection algorithms like LARS are used for sparse coding. LARS optimizes the regression model sequentially by choosing a proper number of variables and adding the best variable to the active set in each iteration. Out of numerous training dictionary methods given in the literature, the ILS-DLA is a variant of the MOD algorithm where the latter is inspired by the GLA and the whole trained dictionary is sequentially updated by alternating between sparse coding and dictionary training steps. The ILS-DLA is different from the MOD for addressing the internal structure of the dictionary by considering overlapping or non-overlapping blocks and modifying the MOD algorithm according to the internal structure of the trained dictionary. The ILS-DLA is faster than the MOD in the sense that it inverts for smaller blocks constructing the trained dictionary rather than inverting for the entire block. The subject of this paper is an integration study between sparse approximations from image processing and compressed sensing, multiple-point statistics from the field of geostatisitcs, and the geophysical methods and reservoir engineering from the branch of petroleum science. This paper specifically emphasizes the utilization of image processing in solving reservoir complexities and enhancing reservoir models.

scholarly journals Gravity Field Theory

2021 ◽  
Author(s):  
Ahmed Shehab Ahmed Al-Banna
Keyword(s):  
Field Theory ◽  
Gravity Field ◽  
Geophysical Methods ◽  
The Other ◽  
Earth Surface ◽  
Gravity Method ◽  
Geophysical Model ◽  
The Earth ◽  
Figure Of The Earth ◽  
Model Understanding

Gravity keep all things on the earth surface on the ground. Gravity method is one of the oldest geophysical methods. It is used to solve many geological problems. This method can be integrated with the other geophysical methods to prepare more accepted geophysical model. Understanding the theory and the principles concepts considered as an important step to improve the method. Chapter one attempt to discuss Newton’s law, potential and attraction gravitational field, Geoid, Spheroid and geodetically figure of the earth, the gravity difference between equator and poles of the earth and some facts about gravity field.

scholarly journals The results of direct-prospecting geophysical methods used for the detection and localization of zones of hydrogen accumulation and migration in the Earth and the Moon cross-sections

2021 ◽  
pp. 65-76
Author(s):  
M.A. Yakymchuk ◽  
◽  
I.M. Korchagin ◽  
Keyword(s):  
Hydrogen Production ◽  
Satellite Images ◽  
Geophysical Methods ◽  
Experimental Studies ◽  
The Moon ◽  
Frequency Resonance ◽  
The Earth ◽  
Basaltic Volcanoes ◽  
Production Site ◽  
Hydrogen Accumulation

The results of experimental studies at the hydrogen production site, hydrogen degassing sites in various regions, as well as on the Moon are presented. Experiments using the direct-prospecting technology of frequency- resonance processing and interpretation of satellite images and photographs are carried out in order to study the features of the deep structure in the areas of hydrogen degassing. The results of instrumental measurements indicate that, in the areas of the basalt volcanoes location with roots at different depths, signals at hydrogen frequencies are almost always recorded. When scanning the cross-section, responses from hydrogen are recorded practically from the upper edges of basalt volcanoes to their roots. Therefore, it can be assumed that basaltic volcanoes are a kind of channels through which hydrogen migrates to the upper horizons of the crosssection and further into the atmosphere. Deep (living) water is synthesized within many basalt volcanoes at a depth of 68 km. Hydrogen-rich water is healing and can be used for wellness purposes. All previously surveyed longevity zones on the Earth are located within basalt volcanoes, in which water synthesized at a depth of 68 km migrates to the surface and is used for the water supply. Hydrogen deposits can be formed by basaltic volcanoes in adjacent sealed reservoirs. The Mali hydrogen production site is located outside the contour of the basalt volcano; hydrogen responses were recorded from marl at the well site. At local sites in the Carpathians, signals from hydrogen are obtained from dolomites and marls. Hydrogen deposits formed near basalt volcanoes in different types of reservoirs can be discovered and localized during areal exploration using the methods of frequency- resonance processing of satellite images and photographs. Direct-prospecting technology can also be used to study reservoirs in crystalline rocks (including basalts). The materials of the article, as well as the previously published results of experimental work in various regions, indicate the advisability of using direct-prospecting methods of frequency–resonance processing of satellite images and photographs to detect zones of hydrogen accumulation in areas, where basalt volcanoes are located, as well as in areas of hydrogen degassing. The use of the mobile low-cost technology will significantly speed up the exploration process for hydrogen, as well as reduce the financial costs for its implementation.

scholarly journals Interpretasi Bawah Permukaan Daerah Penambangan Batuan Andesit Awang Bangkal Kabupaten Banjar Kalimantan Selatan Menggunakan Metode Magnetik

2019 ◽  
Vol 16 (2) ◽  
pp. 117
Author(s):  
Ayi Nurhidayah ◽  
Sri Cahyo Wahyono ◽  
Simon Sadok Siregar
Keyword(s):  
Magnetic Field ◽  
Data Processing ◽  
Geophysical Methods ◽  
Mining Area ◽  
Magnetic Method ◽  
Contour Map ◽  
Total Magnetic Field ◽  
Qualitative And Quantitative ◽  
Qualitative Interpretation ◽  
The Earth

This research has been done in the mining area of andesite rock of Awang Bangkal village by using magnetic method. Magnetic method is one of the most common geophysical methods used for preliminary surveys on petroleum, earth, and mineral rock exploration. It is intended to determine the subsurface distribution in the area by performing qualitative and quantitative interpretations based on the magnetism value of the earth. The result of data processing using geosoft oasis montaj software shows that the total magnetic field anomaly is -807,3 to -361,7 nT. Qualitative interpretation is done by looking at the contour map of the anomaly, the result of upward continuation and the reduction to the poles. While the interpretation is done by making a modeling of the path that has been determined using mag2dc software. The model shows that the rocks that dominate the area are andesite rocks with their susceptibility value of 0.0992 to 0.2305 in SI units.

scholarly journals CORRELATION OF NATURAL PULSED ELECTROMAGNETIC FIELD OF THE EARTH WITH STRESSES AND DEFORMATIONS, WHICH APPEARED IN EXHAUSTED SALT FIELDS IN THE PRECARPATHIANS FOR KARST CREATION FORECASTING

2020 ◽  
pp. 79-88
Author(s):  
S. Bagriy ◽  
E. Kuzmenko ◽  
U. Dzoba
Keyword(s):  
Electromagnetic Field ◽  
Potassium Salt ◽  
Upper Cretaceous ◽  
Evaluation Method ◽  
Geophysical Methods ◽  
Donets Basin ◽  
Salt Deposit ◽  
Pulsed Electromagnetic Field ◽  
The Earth ◽  
Pulsed Electromagnetic

The purpose of the work is to determine the state of study and the prospects for further research on the vertebrate animals remains from the Mesozoic deposits of the Lugansk region. To achieve this goal, collection and generalization of information on the locations of vertebral remains among the Mesozoic deposits of Lugansk region were made. Despite the considerable amount of findings of various groups of Mesozoic vertebrates remains in the Donets Basin territories adjoining them, their systematic and purposeful study, unfortunately, was not conducted in Lugansk region, although indications of the findings of the Mesozoic vertebrates remains in the Luhansk region occur quite often. As a result of the processing of published materials and preliminary interpretation of field observations, a list of 20 sites located mainly on the right bank of the Siversky Donets within the Lugansk region is compiled. Almost all the places are confined to the Upper Cretaceous deposits, much less – to the basal layers of the Paleogene and only one to the Triassic. The vast majority of the locations of the Upper Cretaceous are confined to the area in contact with an array of coal deposits (the so-called "open Carboniferous"). Outwards from it, the rocks are more open-sea and they drastically reduce the diversity of the fossil fauna. Therefore, outlining the range of promising areas regarding finding vertebrate animals remains one should be aware of the above-mentioned pattern of their placement. Triassic deposits of the Donbas are not at all investigated for finding the remains of vertebrates, although their potential is very significant. Nevertheless, due to the small area of the Triassic deposits outcrop in the Lugansk region, searches need to be directed to the west – in the Donetsk and Kharkiv regions.The problem of solving the ecological and geological issues which arise as the result of working off in natural resources (in particular the deposits of potassium salts) is actual at this time. Specificity is in easy solubility of salts and therefore the creation of artificial cavities and karstic phenomena. The article examines the ways to solve the problems of mapping the salt karst and forecasting creation of dips and subsidence of the earth's surface by the example of Kalush-Holyn potassium salt deposit which is located in Ukrainian Precarpathians. As the basis of the research, the complex geophysical methods were considered. It was proved that the method of natural pulsed electromagnetic field of the Earth (NPEMFE) can be selected as a reliable evaluation method of stress-strain state of rocks and prediction of karst processes and deformations which is associated with the presence of extracting chambers. The article describes the physical preconditions for applying the method, sets out the basic postulates of field intensity anomalies classification and proposes the methodology for depth evaluation. Using the real examples - the profile and planar research of potassium salt deposit - the succes of the NPEMFE method is shown, along with its effectiveness to solve some ecological and geological problems, as well as feasibility of using the method in other areas.

scholarly journals Hydrogen as an indicator of geodynamic processes in coal-bearing strata

2021 ◽  
Keyword(s):  
Coal Mining ◽  
Geophysical Methods ◽  
Field Work ◽  
Environmental Research ◽  
Operational Decisions ◽  
Main Research ◽  
Mining Sites ◽  
The Earth ◽  
Coal Deposits ◽  
The World

Formulation of the problem. The problem of developing and implementing exploration technology that will ensure the protection of mine workings and prevent catastrophes in the development of coal deposits is especially relevant now, when the issue of environmental protection and safety at coal mines is very acute. Analysis of recent research and publications. The idea of degassing of the Earth as a global process of its self-organization was developed by V.I. Vernadsky in a number of works published in 1911, 1912, 1924. This concept has had and continues to have a powerful growing influence on modern Earth sciences. The idea of the key role of hydrogen in degassing of the Earth is developed in the works of V.M. Larin, F.A. Letnykov, А.А. Marakushev, V.V. Khmelyovska, A.V. Shcherbakov, N.D. Kozlova, Yu.A. Kolyasnikov, V.M. Shestopalov, V.I. Starostenko, A.N. Ponomarenko. The purpose of the article is: analysis of the current state of coal mining in Ukraine and in the world as a whole; substantiation of the possibility of using the technology of safe search for hydrogen in minefield development zones. Presentation of the main research material. The new development of safe exploration technology for coal deposits, proposed by the authors, will allow to track in advance, to identify places of possible manifestations of gas-dynamic phenomena and to make operational decisions to eliminate them. The technology is based on the use of exploratory gas-geochemical methods for mapping the places of gas-hydrogen accumulations and together with a set of geological and geophysical methods allows to allocate areas of possible emergency processes in the development zones of mine fields. On a large massif of field work of areal and profile surveys, the feasibility of using search technology has been proven to justify the use of advance degassing wells to prevent uncontrolled explosive processes and technical disasters. The proposed technology has been tested at numerous mining sites in the process of exploration and environmental research in areas of operating and developed mine fields. Conclusions. For the first time in the world practice, new approaches were proposed and substantiated to change the safety paradigm of coal mining, which will prevent the manifestations of unpredictable GDP and the associated material and human losses. Analysis of the results of a complex of fundamental and applied research at coal mining facilities allows, according to the proposed technology, to identify and map the studied areas of abnormal hydrogen concentrations, their characteristics and use it as reliable markers for operational decisions for safe mining by laying advance degassing wells, which will ultimately make emergency GDP impossible. The expediency of application of the proposed technology for substantiation and allocation of geodynamic active and stable zones and blocks promising for industrial exploration of hydrocarbons, determining the locations of possible manifestations of GDP and complex making operative decisions for safety of mining works is proved. And, unfortunately, the research carried out by scientists and the results obtained have not yet found worthy support from the President of Ukraine, state line ministries, commercial structures and the Academy of Sciences.

REPORT ON THE LUNAR GEOLOGICAL FIELD CONFERENCE, BEND, OREGON, AUGUST 22–28, 1965

Geophysics ◽  
1966 ◽  
Vol 31 (1) ◽  
pp. 267-275
Author(s):  
W. Hafner
Keyword(s):  
Oil And Gas ◽  
Geophysical Methods ◽  
Primary Field ◽  
Oil Exploration ◽  
The Moon ◽  
Limited Extent ◽  
Foreseeable Future ◽  
The Earth ◽  
Volcanic Terrain

A majority of the membership of the Society of Exploration Geophysicists is engaged, directly or indirectly, in the exploration for oil and gas. Since the habitat of these deposits is confined almost conclusively to the sedimentary portion of the earth’s crust, it is only natural that this portion constitutes their primary field of interest. Their concern with volcanic terrain is often but a negative one, being directed towards the determination of their occurrences and outlines for the purpose of eliminating them as potential oil hunting grounds. This, at least, has been the experience of the writer during a lifetime of oil exploration work. It will, therefore, be of interest to this group of geophysicists to take cognizance of another field of application of the geophysical methods: their use in the investigation of volcanic and impact structures. While this activity is presently of limited extent and confined to the earth, it may in the foreseeable future be extended to the exploration of the moon. The writer had the good fortune to become more fully aware of this field of activity as the representative of the SEG at the recent Lunar Geological Field Conference.

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