scholarly journals Stratigraphic Interpretation of Magnetotelluric Data in Central Saudi Arabia

GeoArabia ◽  
1996 ◽  
Vol 1 (1) ◽  
pp. 52-63
Author(s):  
Ian C.F. Stewart ◽  
Thomas C. Connally ◽  
Jeffrey H. Copley
Keyword(s):  
Saudi Arabia ◽  
Seismic Data ◽  
Hydrocarbon Exploration ◽  
Well Log ◽  
Precambrian Basement ◽  
Magnetotelluric Data ◽  
Model Studies ◽  
Structural Relief ◽  
Basement Structures ◽  
The Relationship

ABSTRACT The pre-Khuff interval of the Paleozoic sediments in central Arabia is poorly defined by conventional seismic techniques, although this layer has significant potential for hydrocarbon exploration. Model studies indicated that magnetotelluric methods could outline the regional changes expected in the pre-Khuff in the area, which are largely dependent on the topography of the Precambrian basement. The Hercynian orogenic event created an extensive block-faulted terrane of half-grabens and horsts. The Hercynian structural relief was infilled in the Permo-Carboniferous and faulting reactivated in Triassic and later time, but the relationship between pre-Khuff and post-Khuff structure was impossible to understand using seismic data alone. In this survey of almost 500 magnetotelluric (MT) stations, essential control on the shallower section was provided by seismic interpretations, in addition to well log data for depths and resistivities. The MT method was very successful in confirming the presence of significant pre-Khuff section over some basement structures, as well as defining areas where the section is thin or absent which may be suitable for further exploration for stratigraphic traps.

scholarly journals Five buried crater structures imaged on reflection seismic data in Saudi Arabia

GeoArabia ◽  
2014 ◽  
Vol 19 (1) ◽  
pp. 17-44
Author(s):  
Allen S. Neville ◽  
Douglas J. Cook ◽  
Abdulkader M. Afifi ◽  
Simon A. Stewart
Keyword(s):  
Saudi Arabia ◽  
Seismic Data ◽  
Surface Expression ◽  
Hydrocarbon Exploration ◽  
Magnetic Data ◽  
Recent Sediment ◽  
Upper Ordovician ◽  
Middle Ordovician ◽  
Reflection Seismic ◽  
Future Work

ABSTRACT Reflection seismic data acquired for hydrocarbon exploration in Saudi Arabia have revealed five buried crater structures ranging in diameter from 5 km to 34 km. These structures have little or no present-day surface expression and span a range of ages from Ordovician to Cenozoic. The Saqqar structure (29°35′N, 38°42″E) is 34 km in diameter and is formed in Devonian siliciclastics. The structure is partially eroded and is unconformably overlain by Upper Cretaceous and Paleogene strata up to 400 m thick. The Jalamid structure (31°27′N, 39°35″E) is 19 km in diameter at Lower Ordovician level and is infilled by Middle Ordovician sediments, at a present-day depth of 4,500 m. The Banat Baqar structure (29°07′N, 37°36″E) is 12 km in diameter at Middle Ordovician level and infilled by Upper Ordovician sediments, at a depth of 2,000 m. The Hamidan structure (20°36′N, 54°44″E) is 16 km in diameter at Paleogene level and is overlain by a thin veneer of Recent sediment. The Zaynan structure (20°23′N, 50°08″E) is 5 km in diameter and affects Triassic sediments at depth of 3,800 m, and is infilled by Jurassic strata. In addition to reflection seismic imaging, various amounts of gravity and magnetic data and drilled wells are available in or near these structures. Various models including impact cratering are discussed here for each structure. One structure (Saqqar) has yielded quartz grains with possible shock metamorphic features that, contingent on future work, may support a meteorite impact crater interpretation.

scholarly journals Forced Fold Amplitude and Sill Thickness Constrained by Wireline and 3-D Seismic Data Suggest an Elastic Magma-Induced Deformation in Tarim Basin, NW China

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 293
Author(s):  
Wei Tian ◽  
Xiaomin Li ◽  
Lei Wang
Keyword(s):  
Tarim Basin ◽  
Seismic Data ◽  
Inelastic Deformation ◽  
Northwest China ◽  
Well Log ◽  
Total Thickness ◽  
Nw China ◽  
Seismic Method ◽  
Two Parameters ◽  
Outer Area

Disparities between fold amplitude (A) and intrusion thickness (Hsill) are critical in identifying elastic or inelastic deformation in a forced fold. However, accurate measurements of these two parameters are challenging because of the limit in separability and detectability of the seismic data. We combined wireline data and 3-D seismic data from the TZ-47 exploring area in the Tarim Basin, Northwest China, to accurately constrain the fold amplitude and total thickness of sills that induced roof uplift in the terrain. Results from the measurement show that the forced fold amplitude is 155.0 m. After decompaction, the original forced fold amplitude in the area penetrated by the well T47 ranged from 159.9 to 225.8 m, which overlaps the total thickness of the stack of sills recovered by seismic method (171.4 m) and well log method (181.0 m). Therefore, the fold amplitude at T47 area is likely to be elastic. In contrast, the outer area of the TZ-47 forced fold is characterized by shear-style deformation, indicating inelastic deformation at the marginal area. It is suggested that interbedded limestone layers would play an important role in strengthening the roof layers, preventing inelastic deformation during the emplacement of intrusive magma.

Stochastic discrete fracture network modeling in shale reservoirs via integration of seismic attributes and petrophysical data

2021 ◽  
pp. 1-50
Author(s):  
Yongchae Cho
Keyword(s):  
Seismic Data ◽  
Stochastic Approach ◽  
Fracture Network ◽  
Natural Fracture ◽  
Well Logs ◽  
Fracture Model ◽  
Well Log ◽  
Discrete Fracture ◽  
Discrete Fracture Network Modeling ◽  
Fracture Network Modeling

The prediction of natural fracture networks and their geomechanical properties remains a challenge for unconventional reservoir characterization. Since natural fractures are highly heterogeneous and sub-seismic scale, integrating petrophysical data (i.e., cores, well logs) with seismic data is important for building a reliable natural fracture model. Therefore, I introduce an integrated and stochastic approach for discrete fracture network modeling with field data demonstration. In the proposed method, I first perform a seismic attribute analysis to highlight the discontinuity in the seismic data. Then, I extrapolate the well log data which includes localized but high-confidence information. By using the fracture intensity model including both seismic and well logs, I build the final natural fracture model which can be used as a background model for the subsequent geomechanical analysis such as simulation of hydraulic fractures propagation. As a result, the proposed workflow combining multiscale data in a stochastic approach constructs a reliable natural fracture model. I validate the constructed fracture distribution by its good agreement with the well log data.

Deepwater reservoir prediction using broadband seismic-driven impedance inversion and seismic sedimentology in the South China Sea

2018 ◽  
Vol 6 (4) ◽  
pp. SO17-SO29 ◽  
Author(s):  
Yaneng Luo ◽  
Handong Huang ◽  
Yadi Yang ◽  
Qixin Li ◽  
Sheng Zhang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Seismic Data ◽  
Seismic Velocity ◽  
The South China Sea ◽  
Hydrocarbon Exploration ◽  
The South ◽  
Low Frequencies ◽  
China Sea ◽  
Impedance Inversion

In recent years, many important discoveries have been made in the marine deepwater hydrocarbon exploration in the South China Sea, which indicates the huge exploration potential of this area. However, the seismic prediction of deepwater reservoirs is very challenging because of the complex sedimentation, the ghost problem, and the low exploration level with sparse wells in deepwater areas. Conventional impedance inversion methods interpolate the low frequencies from well-log data with the constraints of interpreted horizons to fill in the frequency gap between the seismic velocity and seismic data and thereby recover the absolute impedance values that may be inaccurate and cause biased inversion results if wells are sparse and geology is complex. The variable-depth streamer seismic data contain the missing low frequencies and provide a new opportunity to remove the need to estimate the low-frequency components from well-log data. Therefore, we first developed a broadband seismic-driven impedance inversion approach using the seismic velocity as initial low-frequency model based on the Bayesian framework. The synthetic data example demonstrates that our broadband impedance inversion approach is of high resolution and it can automatically balance between the inversion resolution and stability. Then, we perform seismic sedimentology stratal slices on the broadband seismic data to analyze the depositional evolution history of the deepwater reservoirs. Finally, we combine the broadband amplitude stratal slices with the impedance inversion results to comprehensively predict the distribution of deepwater reservoirs. Real data application results in the South China Sea verify the feasibility and effectiveness of our method, which can provide a guidance for the future deepwater hydrocarbon exploration in this area.

scholarly journals Ownership And Firm Performance: The Experience Of Saudi Arabias Emerging Economy

2011 ◽  
Vol 8 (8) ◽  
Author(s):  
Abuzar M. A. Eljelly
Keyword(s):  
Saudi Arabia ◽  
Firm Performance ◽  
Stock Market ◽  
Market Performance ◽  
Return On Assets ◽  
Private Companies ◽  
Return On Equity ◽  
Net Profit ◽  
The Government ◽  
The Relationship

This study examines the relationship between firm ownership and corporate performance in Saudi Arabia, using a sample of Listed Private Companies (LPCs) and Listed Government Related Companies (LGRCs). The study compares the operating and market performance of the LPCs and LGRCs during the period 2000-2003 and found that, in general, LGRCs outperform or match the performance of LPCs. More specifically, the study finds that LGRCs tend to mostly outperform LPCs in terms of profitability, as measured by Return on equity (ROE) and Net Profit Margin (NPM), operating efficiently, as measured in terms of Return on assets (ROA), and match them in their stock market risk adjusted performance. The study concludes that these results may have implications for the issue of privatization programs which the government has recently started.

scholarly journals The effect of watching the satellite programs on the skills of the talented students at the Eastern Region (Dammam) in the Kingdom of Saudi Arabia: أثر مشاهدة البرامج الفضائية على المهارات الاجتماعية لدى الطلبة الموهوبين في المنطقة الشرقية (الدمام) بالمملكة العربية السعودية

2020 ◽  
Vol 4 (40) ◽  
Author(s):  
Abdullah Salem Ahmad Alomari
Keyword(s):  
Saudi Arabia ◽  
Social Skills ◽  
Analysis Of Variance ◽  
Social Adjustment ◽  
Eastern Region ◽  
The Social ◽  
Space Programs ◽  
Satellite Channels ◽  
Talented Students ◽  
The Relationship

The present study aimed to reveal the relationship between the quality of space programs watched by children and the social skills of these children،  the study is also trying to identify the relationship between the number of hours watching this space programs and the social skills for these children. The study used a descriptive approach،  the study sample consisted of 215 boys and girls aged between 9- 12 years schools of Al- Dammam in Saudi Arabia،  the researcher used to identify children's programs television watched by children،  where the researcher in this study on the method of analysis of variance One-way Analysis of Variance and Scheffe test for multiple comparisons Multiple Comparison،  which resulted in findings on the lack of social skills for different dimensions: emotional sensitivity،  emotional and adjustment،  and the overall degree of social skills depending on the type of space programs that children watch. In addition to the lack of different social skills for the dimensions: emotional expression،  sensitivity،  emotionality،  and social expression،  and social sensitivity،  and the overall degree of social skills،  while the different settings of emotional and social adjustment depending on the number of hours watching TV channels،  for children who watch satellite channels less.

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