PRECISE MEASUREMENT OF DEEP ELECTRICAL ANOMALIES

Geophysics ◽  
1944 ◽  
Vol 9 (4) ◽  
pp. 494-539 ◽  
Author(s):  
Thomas S. West ◽  
Clarence C. Beacham
Keyword(s):  
Precise Measurement ◽  
Oil And Gas ◽  
Depth Resolution ◽  
Lateral Variation ◽  
Current Electrode ◽  
Subsurface Zones ◽  
Electrical Prospecting ◽  
Direct Location ◽  
A Current ◽  
Made In

A method of electrical prospecting has been developed in which the deleterious effects of superficial inhomogeneities in resistivity are eliminated. An electrode configuration is used consisting of a current electrode at “infinity,” a pair of current electrodes with a constant separation of a few hundred feet which are used alternately, and a pair of potential electrodes with a constant separation of a few hundred feet, collinear with the pair of current electrodes, and at a distance from them which is varied to secure depth resolution. It is demonstrated that superficial influences are eliminated by forming the resistivity increment, the ratio between apparent resistivity determined by use of the closer current electrode of the alternate pair and that determined by use of the farther current electrode of the alternate pair. It is also demonstrated that the area explored is below a point approximately half‐way between the alternate pair of current electrodes. Resistivity increment curves, called Resistologs by the authors, can be correlated from station to station, and after they are correlated the lateral variation in the electrical properties of selected subsurface zones can be studied. As a result of the latter characteristic of the measurements, a possibility exists for the direct location of oil and gas, observational evidence for which is presented. The results of surveys made in Hart County, Kentucky, and in the Sam Fordyce, Seven Sisters, Pettus, Branyon, Dunlap, Oakville, and Rhode Ranch fields of Southwest Texas are displayed.

GEOPHYSICAL PROGRESS

Geophysics ◽  
1953 ◽  
Vol 18 (3) ◽  
pp. 510-524 ◽  
Author(s):  
Henry C. Cortes
Keyword(s):  
United States ◽  
Oil And Gas ◽  
Geophysical Methods ◽  
The United States ◽  
Oil Fields ◽  
First Year ◽  
Free Enterprise ◽  
Gravity And Magnetic ◽  
Electrical Prospecting ◽  
Made In

Histories or reviews covering the period from 1922, the first year of petroleum geophysics in the United States, to 1940 were ably presented by Eckhardt, Macelwane and Weatherby at the Society of Exploration Geophysicists’ Annual Meeting of the latter year. This paper deals mainly with advances in geophysics since 1940. Marked progress has been made in the amount of geophysical activity, in the number of new oil fields discovered per year based wholly or partially on geophysics, in geophysical techniques, and in education. Improvements in instrumentation, field operational procedures, and interpretation methods have steadily increased the usefulness of the three major methods—seismic, gravity, and magnetic. The development of the aerial magnetometer, especially, and the underwater gravimeter represent notable achievements. These developments have made possible the extension of geophysical activity offshore, and in many other areas previously considered inaccessible. Advances have also been made in logging, particularly in the radioactivity type, geochemistry and electrical prospecting. Research, both fundamental and applied, is being conducted on a greater scale now than in 1940 or prior thereto. Increased geological‐geophysical coordination has led to better appreciation and utilization of the geophysical methods and has resulted in the discovery of important oil and gas reserves. Novel or more direct oil finding methods may possibly be discovered or perfected. It is more probable, however, that the future of exploration geophysics will be primarily in the continual refinement of the present known methods. Advances in exploration geophysics and geology, along with teamwork, should insure adequate production and reserves within the United States for a long period. This is predicated on our nation having competitive free enterprise, which has been responsible for the leadership of this country in oil finding, producing, transporting and refining techniques.

A mise‐à‐la‐masse study of the Cavendish Geophysical Test Site

Geophysics ◽  
1983 ◽  
Vol 48 (9) ◽  
pp. 1252-1257 ◽  
Author(s):  
L. Mansinha ◽  
C. J. Mwenifumbo
Keyword(s):  
Potential Field ◽  
Test Site ◽  
Drill Hole ◽  
Mineral Deposit ◽  
Current Electrode ◽  
Underground Openings ◽  
Mineralized Zone ◽  
Electrical Prospecting ◽  
Drill Holes ◽  
A Current

The mise‐à‐la‐masse method of electrical prospecting is used when a conductive, mineralized zone has already been located. A current electrode is placed directly in the mineralized zone, and the resulting potential field is mapped on the surface or in the subsurface via drill holes or underground openings. The potential field reflects the shape, size, and orientation of the mineral deposit. A field study of this method was carried out at the Cavendish Geophysical Test Site in Ontario, Canada. Two vein‐type mineralized bodies, zone A and zone B, are known to exist at the site. Drill holes were used to implant a current electrode in each of the veins and surface potentials were measured. The extension of the two zones in the strike direction was established with the resulting mise‐à‐la‐masse potential profiles. However, no electrical continuity between zones A and B could be discerned, indicating that the veins are not connected at depth. The dip of zone A appears to be toward the west, contrary to that inferred from the drill hole logs. The measured potentials are influenced by the mutual proximity of the far current and potential electrodes as well as by the location of the electrodes with reference to the local geologic structure.

A Framework to Support the Optimization of Modularized Oil and Gas Structures

2018 ◽  
Author(s):  
Vincenzo Castorani ◽  
Paolo Cicconi ◽  
Michele Germani ◽  
Sergio Bondi ◽  
Maria Grazia Marronaro ◽  
...  
Keyword(s):  
Lead Time ◽  
Oil And Gas ◽  
Steel Structure ◽  
Steel Structures ◽  
Modular System ◽  
Test Case ◽  
Plant Design ◽  
Conceptual Study ◽  
A Current ◽  
Gas Plants

Modularization is a current issue in the context of plant design. A modular system aims to reduce lead time and cost in design phases. An oil & gas plant consists of many Engineered-To-Order solutions to be submitted and approved during the negotiation phase. In this context, design tools and methods are necessary to support the design life cycle from the conceptual study to the detailed project. The paper proposes an approach to optimize the design of modularized oil & gas plants with a focus on the related steel structures. A test case shows the configuration workflow applied to a modular steel structure of about 400 tons. The modularized layout has been optimized using genetic algorithms. A Knowledge Base has been described to support the configuration phase related to the conceptual design. Design rules and metrics have been formalized from the analysis of past solutions.

XXXVIII.—Observations with a Current Meter in Loch Ness

1909 ◽  
Vol 29 ◽  
pp. 619-647 ◽  
Author(s):  
E. M. Wedderburn ◽  
W. Watson
Keyword(s):  
Experimental Investigation ◽  
Fixed Point ◽  
Great Lakes ◽  
Large Lake ◽  
Deep Lakes ◽  
Small Lake ◽  
Stormy Weather ◽  
Set Up ◽  
A Current ◽  
Made In

One of the authors having made an experimental investigation on the currents produced in a trough of water by a blast of air driven along the surface of the water, it was desired to test the correctness of his deductions by actual observations in a large lake. Loch Ness was chosen on account of its length and uniformity of basin, as it was thought that the length and narrowness of the loch would lead to clearly defined currents being set up in the lake. The sequel showed, as in the case of observations on seiches, that it would have been better to confine attention to a smaller lake, for a twofold reason, (1) because in a large lake the difficulties of observations are much greater than in a small lake during stormy weather, and in very deep lakes the difficulties in the way of obtaining a fixed point from which to use the current meter are formidable, and (2) because it would seem from a few observations made in Loch Garry (Ness Basin) that currents are more defined and more regular in small than in great lakes.

scholarly journals Removal of Hydrogen Sulfide (H2S) Using MOFs: A Review of the Latest Developments

2020 ◽  
Vol 2 (1) ◽  
pp. 27
Author(s):  
Amvrosios G. Georgiadis ◽  
Nikolaos D. Charisiou ◽  
Ioannis V. Yentekakis ◽  
Maria A. Goula
Keyword(s):  
Hydrogen Sulfide ◽  
Oil And Gas ◽  
Great Promise ◽  
New Developments ◽  
Specific Heats ◽  
Gas Streams ◽  
Long Time ◽  
Metal Organic ◽  
Bed Stability ◽  
Made In

The removal of hydrogen sulfide (H2S) from gas streams with varying overall pressure and H2S concentrations is a long-standing challenge faced by the oil and gas industries. The present work focuses on H2S capture using metal–organic frameworks (MOFs), in an effort to shed light on their potential as adsorbents in the field of gas storage and separation. MOFs hold great promise as they make possible the design of structures from organic and inorganic units, but also, they have provided an answer to a long-time challenging issue, i.e., how to design extended structures of materials. Moreover, the functionalization of the MOF’s surface can result in increased H2S uptake. For example, the insertion of 1% of a fluorinated linker in MIL-101(Cr)-4F(1%) allows for enhanced H2S capture. Although noticeable efforts have been made in studying the adsorption capacity of H2S using MOFs, there is a clear need for gaining a deeper understanding in terms of their thermal conductivities and specific heats in order to design more stable adsorption beds, experiencing high exothermicity. Simply put, the exothermic nature of adsorption means that sharp rises in temperature can negatively affect the bed stability in the absence of sufficient heat transfer. The work presented herein provides a detailed discussion by thoroughly combining the existing literature on new developments in MOFs for H2S removal, and tries to provide insight into new areas for further research.

scholarly journals Fluoride removal using electrocoagulation technique

2021 ◽  
Vol 877 (1) ◽  
pp. 012047
Author(s):  
Hind M. Ewadh ◽  
Mustafa J. Al Imari ◽  
Sabrean F. Jawad ◽  
Hayfaa A. Mubarak
Keyword(s):  
Severe Disease ◽  
Electrical Current ◽  
Electrode Spacing ◽  
Polluted Water ◽  
Fluoride Removal ◽  
Acidic Environment ◽  
Current Electrode ◽  
The Past ◽  
The Impact ◽  
A Current

Abstract A modest quantity of fluoride can increase the mineralization of teeth and reduce their cavities. But the presomerence of fluoride in excess in water can lead to severe disease infertility. In the past few decades, scientists have thus been preoccupied with developing ways to reduce sewage fluoride concentrations and reduce their effects on human health. The present study is aimed at using the technology of electrocoagulation to remove fluoride from polluted water. Tests have been done to examine the elimination of fluoride with a rectangular electrocoagulation cell and examine the impact of the experimental aspects on fluoride extraction, specifically electrical current, electrode spacing, and pH. The authors found that 93% of the fluoride has been extracted using 5mm spaced electrodes with a current density of 2 mA/cm2 and a level of pH of 7 from the polluted water after 20 min of processing. Experimental factors considerably impact the efficacy of fluoride removal. In the acidic environment, greater effectiveness of fluoride removal is being attained. The elimination effectiveness depends directly on the electric current, whereas the distance between poles is adversely linked to fluoride elimination.

scholarly journals Progress in Cooling Nanoelectronic Devices to Ultra-Low Temperatures

2020 ◽  
Vol 201 (5-6) ◽  
pp. 772-802 ◽  
Author(s):  
A. T. Jones ◽  
C. P. Scheller ◽  
J. R. Prance ◽  
Y. B. Kalyoncu ◽  
D. M. Zumbühl ◽  
...  
Keyword(s):  
State Of The Art ◽  
Electronic Devices ◽  
Bulk Materials ◽  
Nanoelectronic Devices ◽  
Current State ◽  
Physical Effects ◽  
On Chip ◽  
Nanoscale Physics ◽  
A Current ◽  
Made In

AbstractHere we review recent progress in cooling micro-/nanoelectronic devices significantly below 10 mK. A number of groups worldwide are working to produce sub-millikelvin on-chip electron temperatures, motivated by the possibility of observing new physical effects and improving the performance of quantum technologies, sensors and metrological standards. The challenge is a longstanding one, with the lowest reported on-chip electron temperature having remained around 4 mK for more than 15 years. This is despite the fact that microkelvin temperatures have been accessible in bulk materials since the mid-twentieth century. In this review, we describe progress made in the last 5 years using new cooling techniques. Developments have been driven by improvements in the understanding of nanoscale physics, material properties and heat flow in electronic devices at ultralow temperatures and have involved collaboration between universities and institutes, physicists and engineers. We hope that this review will serve as a summary of the current state of the art and provide a roadmap for future developments. We focus on techniques that have shown, in experiment, the potential to reach sub-millikelvin electron temperatures. In particular, we focus on on-chip demagnetisation refrigeration. Multiple groups have used this technique to reach temperatures around 1 mK, with a current lowest temperature below 0.5 mK.

The application of the mise-a-la-masse electrical technique in Greenstone belt gold exploration

1989 ◽  
Vol 20 (2) ◽  
pp. 113
Author(s):  
L.G.B.T. Polomé
Keyword(s):  
Greenstone Belt ◽  
Electrical Potential ◽  
Gold Deposits ◽  
Iron Formation ◽  
Banded Iron Formation ◽  
Current Electrode ◽  
Barberton Greenstone Belt ◽  
A Current ◽  
Ore Zones ◽  
Gold Bearing

Most of the gold deposits in the Barberton Greenstone belt of South Africa are relatively small and in structurally complex geological areas.The mise-a-la-masse electrical technique, where a current electrode is earthed in a mineralised zone, was used on one of our exploration projects consisting of a sulphides/gold-bearing carbonaceous banded iron formation within a succession of mafic, ultramafic and sedimentary rocks. The technique was successful in delineating individual mineralised units within a broad lithological sequence. During the survey, electrical potential measurements were recorded on surface, in underground drives and in twenty five boreholes. Measurements were also repeated by earthing the mineralised zone in a number of boreholes. Major discontinuities were recognised within the ore zones and used to interpret geological structures. These were then used to define specific units for ore reserve calculations and the application of selected mining techniques.

scholarly journals Narrative medicine in medical diagnosis

2020 ◽  
pp. 1-5
Author(s):  
Raúl Pino Andrade
Keyword(s):  
Interpersonal Relationships ◽  
Teaching And Learning ◽  
Narrative Medicine ◽  
Medical Field ◽  
History Of ◽  
The Relationship ◽  
Historical Periods ◽  
A Current ◽  
Made In

Modernity has brought with it a series of scientific advances that, in the medical field, have improved not only the diagnosis and treatment of diseases, but also the quality of life of patients. This is undeniable. It is enough to carry out an exercise of imagination and place our life in two different historical settings: first the Renaissance, and second the XXI century or contemporary era. Leaving cultural or historical affinities aside, to the question: In which of these historical periods would you like to live? The most prudent answer is very likely: now, in this century. The advances of medicine can be traced historically, we cannot think about it without thinking in Vesalius, or Paré, and many others; however, it is true that the history of medicine accelerated markedly in the 20th century. Although it is true that in just over a hundred years the greatest scientific discoveries have been made in all fields of knowledge, modernity has also meant a change in time itself. Everything unfolds at previously unimaginable speeds: material and knowledge production, teaching and learning, communication and interpersonal relationships. The latter point should be highlighted, and the changes due to the acceleration of the relationship between doctors and their patients should be pointed out on time. It is as if life should climb the assembly line and obey a Fordist logic. It must be recognized that the acceleration of certain aspects is significant, such as the expansion of diagnostic tests, creation of procedures and medications, immediate response to emergencies, among others. But all these advantages seem to carry with them, as a current, all areas of life including what must necessarily be paused.

EXPLORATION AND GEOLOGY OF THE WEST SULU BASIN, PHILIPPINES

1974 ◽  
Vol 14 (1) ◽  
pp. 21 ◽  
Author(s):  
R. M. Bell ◽  
R. G. C. Jessop
Keyword(s):  
Oil And Gas ◽  
The Philippines ◽  
The West ◽  
Sulu Sea ◽  
North East ◽  
The North ◽  
Tectonic Events ◽  
Provisional Identification ◽  
Western Portion ◽  
Made In

The West Sulu Basin lies in the western portion of the Sulu Sea. Republic of the Philippines. It occupies an area in excess of 26,000 square miles (67,000 km2) and is bounded to the west and south by the cordilleran arc extending from the island of Palawan through Sabah and along the Sulu Archipelago to the island of Mindanao. To the north-east, the basin probably extends beyond the edge of the continental shelf in Philippine territorial waters.The basin may be broadly divided into a western platform and an eastern deep: the latter is subdivided by northeast-trending basement ridges into three sub-basins. Sediments deposited in these sub-basins are of Tertiary to Recent age and have been affected by several orogenies and by contemporaneous movements of fault-controlled blocks. This has resulted in truncation and the development of marked erosion surfaces and onlap within the Upper Tertiary section. Many anticlinal features mapped within the basin have resulted from drape over basement highs or from penecontemporaneous growth of these highs.Major unconformities associated with Upper Tertiary tectonic events have been recognized onshore. Extrapolation to offshore areas where these events can be seismically mapped has enabled an interpretative geologic model to be built up. Provisional identification of stratigraphic units and their nature have been made using this model.The Upper Tertiary section within the eastern deep is expected to consist of deltaic and paralic reservoir sands interbedded with, grading into and transgressed by deeper water shale and mudstone with good hydrocarbon source potential. Some limestone lenses may be present.The presence of Lower to Middle Miocene diapiric shale and Plio-Pleistocene intrusives coupled with data of variable quality makes seismic interpretation difficult in some areas. However, several large anticlinal features and a number of stratigraphic and combination traps have been located.A non-commercial discovery of oil and gas has been made in the basin.

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