Subsalt imaging in northern Germany using multiphysics (magnetotellurics, gravity, and seismic)

2020 ◽  
Vol 8 (4) ◽  
pp. SQ15-SQ24
Author(s):  
Christian H. Henke ◽  
Markus H. Krieger ◽  
Kurt Strack ◽  
Andrea Zerilli
Keyword(s):  
Oil And Gas ◽  
Gravity Data ◽  
Salt Dome ◽  
Gravity Modeling ◽  
Field Source ◽  
Oil And Gas Exploration ◽  
Exploration Drilling ◽  
Seismic Depth Migration ◽  
Improved Model ◽  
Subsalt Imaging

Imaging subsalt is still a challenging task in oil and gas exploration. We have used magnetotellurics (MT) to improve the integration of seismic and gravity data to image the Wedehof salt dome, located in the Northern German Basin. High-density natural field source broadband MT data were acquired and enhanced the definition of the top and overhanging salt structures in addition to imaging the salt dome root. Salt boundaries show strong resistivity contrasts with the surrounding sediments and thus represent a good target for electromagnetic measurements, especially for top salt and salt flanks imaging. With integrated 3D gravity modeling focusing on the salt dome’s flanks at intermediate depths, an improved model was achieved. The new model provided sound input to a follow-up seismic depth migration that led to an improved imaging of the subsalt target proven by subsequent exploration drilling. The integrated interpretation of MT, gravity, and seismic combines the strengths of the different physics, thus increasing imaging reliability and reducing exploration drilling risks. Using a conservative workflow that included a feasibility study with field noise evaluation and careful acquisition parameter testing prior to survey start, a broadband array data acquisition, and advanced processing, the survey area's severe cultural noise issues could be overcome.

scholarly journals Institutions and the Location of Oil Exploration

2019 ◽  
Vol 18 (3) ◽  
pp. 1321-1350 ◽  
Author(s):  
James Cust ◽  
Torfinn Harding
Keyword(s):  
Oil And Gas ◽  
Institutional Quality ◽  
Regression Discontinuity Design ◽  
Host Countries ◽  
Data Set ◽  
Oil And Gas Exploration ◽  
Oil Companies ◽  
Exploration Drilling ◽  
Oil Sector ◽  
Global Data

AbstractWe provide evidence that institutions have a strong influence over where oil and gas exploration takes place. We utilise a global data set on the location of exploration wells and national borders. This allows for a regression discontinuity design with the identifying assumption that the position of borders was determined independently of geology. In order to break potential simultaneity between borders, institutions, and activities in the oil sector, we focus on drilling that occurred after the formation of borders and institutions. Our sample covers 88 countries over the 1966–2010 period. At borders, we estimate more than twice as much drilling on the side with better institutional quality. Subsample analyses reveal effects of institutions on exploration drilling in both developing and high income countries, as well as across three types of operating companies. We find that the supermajor international oil companies are particularly sensitive to institutional quality in developing countries. Our findings are consistent with the view that institutions shape both exploration companies’ incentives to invest in drilling and host countries’ supply of drilling opportunities.

scholarly journals Initial exploration of Hydrocarbon resources by Gravity Data: A Case Study in the South of Qom Province, Iran

2015 ◽  
Vol 2 (1) ◽  
pp. 52-57
Author(s):  
Payam Salimi
Keyword(s):  
Oil And Gas ◽  
Gravity Data ◽  
Geophysical Methods ◽  
Local Effect ◽  
Oil And Gas Exploration ◽  
Residual Gravity ◽  
3D Geometry ◽  
Residual Gravity Anomaly ◽  
Matlab Programming

Geophysical methods widely used in oil and gas exploration. Modeling of gravity data is used extensively to illustrate the geometry and interface between the sediments and bedrock. Which can help the salt dome, anticline folds, dome-shaped uplift of the continental platform and reef masses to be identified. There are various methods to illustrate the bedrock topography, and we will describe one of these methods in present paper. Using the upward continuation, we extract the residual gravity anomaly which in fact shows the local effect of bedrock gravity on the observed gravity. Then, according to the Oldenburg - Parker method, the residual gravity data are inversed and finally the 3D geometry the bedrock is illustrated. It should be noted that some software's like Surfer and Excel are used in this research but the program main code is written using Matlab programming.

A new method for underwater dynamic gravimetry based on multisensor integrated navigation

Geophysics ◽  
2020 ◽  
Vol 85 (3) ◽  
pp. G69-G80
Author(s):  
Zhiming Xiong ◽  
Juliang Cao ◽  
Kaixun Liao ◽  
Meiping Wu ◽  
Shaokun Cai ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Finite Impulse Response ◽  
Gravity Data ◽  
Satellite System ◽  
New Method ◽  
Integrated Navigation ◽  
Oil And Gas Exploration ◽  
Half Wavelength ◽  
Marine Gravity ◽  
Global Navigation Satellite

Underwater gravity information plays a major role in deepwater oil and gas exploration. To realize underwater dynamic gravimetry, we have developed a strapdown gravimeter mounted in a pressure capsule for adaption to the underwater environment and we adopted a two-stage towed underwater gravimetry scheme. An improved strapdown gravimeter and other underwater sensors were installed in a towed vessel to form an underwater dynamic gravimetry system. Because the global navigation satellite system cannot be used for underwater dynamic gravimetry, we developed a new method based on underwater multisensor integrated navigation, in which a federal Kalman filter was applied for error estimation. This new method allowed us to obtain the accurate attitude, velocity, and position necessary for gravity estimation. In addition, the gravity data can then be extracted from the noisy data through finite impulse response low-pass filtering. We acquired the underwater gravity data at a depth of 300 m to test the validity of the new method and evaluate the accuracy of the underwater gravity system. The results indicated a repeatability from 0.85 to 0.96 mGal at a half wavelength of approximately 0.2 km and also indicated good consistency with the marine gravity data.

scholarly journals Recognition of the pre-salt regional structure of Kwanza basin, offshore in West Africa, derived from the satellite gravity data and seismic profiles

2020 ◽  
Vol 17 (6) ◽  
pp. 956-966
Author(s):  
Longjun Qiu ◽  
Zhaoxi Chen ◽  
Yalei Liu
Keyword(s):  
Oil And Gas ◽  
Gravity Data ◽  
Shielding Effect ◽  
Regional Structure ◽  
Seismic Profiles ◽  
Satellite Gravity ◽  
Oil And Gas Exploration ◽  
Tectonic Model ◽  
Salt Structure ◽  
Seismic Reflection Profiles

Abstract Kwanza basin, located on the west coast of Africa and the east side of the South Atlantic Ocean, has the potential for deep-water oil and gas exploration. Previous studies have shown that the pre-salt system within the area has high potential for oil and gas storage. However, due to the shielding effect of the evaporating salt rock during the Aptian period, the quality of seismic reflection profiles of the pre-salt layers is poor. This means that the pre-salt sequences, the main fault, the scale and distribution pattern of the rift are not clear. To clarify the pre-salt regional structure pattern and further guide pre-salt exploration, we carried out a series of analyses and target processing of seismic and gravity data. Further, combining other available geological and lithology data as well as a tectonic model, we put forward a new understanding of the pre-salt structure of Kwanza basin. The research shows that the Kwanza basin can be divided into three uplift belts below the salt layer, which are distributed in the NW–SE trending direction. The three key profiles illustrate the distribution of uplift and depression in detail. The explained structural highs distributed in the outer Kwanza basin may be related to oil and gas reservoir. This study could provide the geophysical basis for the re-interpretation of the pre-salt seismic sequence, the strategic selection of pre-salt oil and gas and the next exploration deployment.

230C Hermetically Sealed SMD Tantalum Capacitors

2013 ◽  
Vol 2013 (HITEN) ◽  
pp. 000001-000007
Author(s):  
T. Zednicek ◽  
M. Biler ◽  
J. Petrzilek ◽  
I. Pinwill ◽  
R. Faltus
Keyword(s):  
Oil And Gas ◽  
Multiple Sources ◽  
Operating Life ◽  
Oil Drilling ◽  
Oil And Gas Exploration ◽  
Geological Conditions ◽  
Operational Life ◽  
Exploration Drilling ◽  
Long Life ◽  
Basic Behavior

Certain electronic applications, such as oil and gas exploration drilling, are continuously demanding ever higher operating temperatures. Recently operating temperature requirements have increased from 200°C to 230°C with an increased operating life from hours to one thousand hours and beyond. This need is linked with the continuous development of oil drilling heads and sensors and their use for deeper drilling or drilling in more difficult geological conditions. Capacitors with high capacitance value are a common part of the electronic boards used in these applications, but over 125°C/175°C, available capacitor choice is very limited. Tantalum SMD capacitor technology has proved its reliability in operation up to 175°C and there is a limited choice of special designs up to 200°C. Long life wet tantalum capacitors up to 200°C are available from multiple sources, or up to 230°C with reduced operational life from a single source. Hermetically sealed MnO2 tantalum capacitors have demonstrated their ability to offer unique long life stability at 230C combined with solid, stable and robust design. [1]. The next testing and development presented in this paper discusses the basic behavior of the solid hermetically sealed MnO2 tantalum capacitor above 200°C. A certain type of “wear out” has been observed in a longer exposure at 230°C depending on applied voltage. Nevertheless, the basic capability of the capacitor meets the “best in class” requirement for 230°C 1000hours continuous operating life with 50% voltage derating. The paper discusses and summarizes the “wear out” phenomenon observed at temperatures above 200°C on these capacitors and impact of different voltage derating to operational life at 230°C .

scholarly journals Application of BigData technology to improve the efficiency of Arctic shelf fields development

2021 ◽  
Vol 937 (4) ◽  
pp. 042080
Author(s):  
E G Katysheva
Keyword(s):  
Big Data ◽  
Oil And Gas ◽  
The State ◽  
The Arctic ◽  
Oil And Gas Exploration ◽  
Natural Processes ◽  
Unbiased Manner ◽  
Development Processes ◽  
Exploration Drilling ◽  
Big Data Technology

Abstract Development processes in the Arctic zone require that a set of tasks related to the development or improvement of technologies, as well as to the optimization of project management methods be solved. It has been noted that in order to solve the tasks, fast updated Big Data is needed, the timely acquisition and processing of which will allow for unbiased assessment of the current situation, taking appropriate management decisions, and prompt adjusting as new factors arise. It has been concluded that the introduction of Big Data technology is considered to be the most efficient Industry 4.0 tool for geological survey, and data arrays on the state of exploration of the territories and the results of exploration drilling can serve as the basis for an information model of oil and gas exploration. It has also been found that the array accumulated by subsoil users in the course of scientific research makes it possible to significantly increase the state of exploration of the natural Arctic environment and assess in an unbiased manner the natural processes that occur in the areas of the northern seas. Based on the analysis of the collected data, to predict the state of the natural environment and further develop optimal technical and managerial solutions for the development of the Arctic fields is possible.

Areas of historical oil and gas exploration and production in the conterminous United States

1995 ◽  
Author(s):  
Richard F. Mast ◽  
D.H. Root ◽  
L.P. Williams ◽  
W.R. Beeman
Keyword(s):  
United States ◽  
Oil And Gas ◽  
Oil And Gas Exploration ◽  
Exploration And Production
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