Optimization of converted wave 3D3C seismic acquisition geometry for fissured gas reservoir

2009 ◽  
Author(s):  
Xiangrong Xu ◽  
Jianming Tang
Keyword(s):  
Converted Wave ◽  
Gas Reservoir ◽  
Seismic Acquisition ◽  
Seismic Acquisition Geometry

Comparing P-P, P-SV, and SV-P mode waves in the Midland Basin, West Texas

2016 ◽  
Vol 4 (2) ◽  
pp. T183-T190 ◽  
Author(s):  
Michael V. De Angelo ◽  
Bob A. Hardage
Keyword(s):  
Vertical Component ◽  
P Wave ◽  
Seismic Survey ◽  
Vertical Force ◽  
S Wave ◽  
Converted Wave ◽  
Midland Basin ◽  
West Texas ◽  
Exploration Risk ◽  
Seismic Acquisition

We acquired 3D multicomponent data in Andrews County, Midland Basin, West Texas with a seismic survey. We extracted direct-SV modes generated by a vertical-force source (an array of three inline vertical vibrators) from the vertical component of multicomponent geophones. This seismic mode, SV-P, was created by reprocessing legacy 2D/3D P-wave seismic data to create converted-wave data and consequently forgoing the need for a multicomponent seismic acquisition program to obtain important S-wave information from the subsurface. We have compared P-P, P-SV, and SV-P traveltime and amplitude characteristics to determine which seismic mode provided better characterization of the targeted reservoirs and reduced exploration risk.

scholarly journals Fast multifrequency focal beam analysis for 3D seismic acquisition geometry

Geophysics ◽  
2012 ◽  
Vol 77 (2) ◽  
pp. P11-P21 ◽  
Author(s):  
Wei Wei ◽  
Li-yun Fu ◽  
Gerrit Blacquière
Keyword(s):  
Computational Cost ◽  
Computer Time ◽  
Oil Field ◽  
Single Frequency ◽  
3D Seismic ◽  
Efficient Computation ◽  
Complex Media ◽  
Beam Analysis ◽  
Seismic Acquisition ◽  
Seismic Acquisition Geometry

A method for the efficient computation of multifrequency focal beams for 3D seismic acquisition geometry analysis has been developed. By computing them for all the frequency components of seismic data, single-frequency focal beams can be extended to multifrequency focal beams. However, this straightforward method involves considerable computer time and memory requirements, especially in complex media settings. Therefore, we propose a rapid 3D multifrequency focal beam method in which only a few single-frequency focal beam computations are followed by a number of smart interpolations. The 3D wavefield extrapolation in the focal beam analysis is conducted by the combined applications of a 3D degenerate Fourier migrator and a 3D Born-Kirchhoff interpolation operator, a process that reduces the computational cost for complex media. The multifrequency focal beam analysis is applied to a 3D model from an oil field of China, demonstrating how spatial sampling differences affect seismic imaging.

Seismic acquisition and imaging strategies for unlocking subsurface complexities in Malaysian basins

2020 ◽  
Vol 39 (8) ◽  
pp. 583-590
Author(s):  
Sandeep K. Chandola ◽  
Abdul Aziz Muhamad ◽  
Tang Wai Hoong ◽  
Faizan Akasyah Ghazali ◽  
Ashraf Khalil
Keyword(s):  
Survey Design ◽  
Waveform Inversion ◽  
Integrated Approach ◽  
Seismic Survey ◽  
Reverse Time ◽  
Converted Wave ◽  
Imaging Technologies ◽  
Time Migration ◽  
Seismic Acquisition ◽  
Exploration And Development

Seismic data acquisition and imaging technologies have made important contributions to hydrocarbon discoveries and enhancing recovery from existing reservoirs in Malaysian basins. PETRONAS has been leveraging these technologies to address the exploration and development challenges encountered in Malaysian basins and other parts of the world and to support its play-based exploration. Some of the key technology applications include imaging below shallow gas and carbonates, imaging of complex geology for exploring deep water and deep plays, and high-resolution imaging of shallow clastic plays. Dual and multimeasurement streamers, multiazimuth and full-azimuth seismic, triple- and penta-source blended acquisition, and two- and four-component seabed seismic technologies have been integrated with high-end processing and imaging technologies such as advanced demultiple techniques, deblending, full-waveform inversion, reverse time migration, and PS-converted wave imaging to address complex subsurface challenges. In this article, we present an overview of the evolution and application of innovative seismic acquisition and imaging technologies in Malaysian basins. Selected case histories demonstrate how these technologies have enabled explorers to unlock subsurface complexities, adding value to exploration and development activities. We share the advancements in 3D seismic survey design, marine streamer acquisition, seabed seismic acquisition, and seismic imaging technologies, and how an integrated approach helped PETRONAS address geologic challenges to enhance its exploration success.

scholarly journals Study of Converted-Wave Modeling: AVO Application for Shallow Gas Models

2018 ◽  
Vol 16 (2) ◽  
pp. 19 ◽  
Author(s):  
Natashia Christy Viony ◽  
Wahyu Triyoso
Keyword(s):  
Data Processing ◽  
Vertical Component ◽  
Hydrocarbon Exploration ◽  
P Wave ◽  
Diffraction Effect ◽  
S Wave ◽  
Converted Wave ◽  
Gas Reservoir ◽  
Shallow Gas ◽  
Wave Data

The application of converted-wave seismic method in hydrocarbon exploration has increased significantly. Since the conventional seismic ceases to provide an adequate result in complex geology area and it provides an ambiguous brightspot response. The main principle is that an incident P-wave produces reflected and converted P and SV wave when the downgoing P-wave impinges on an interface. Converted-wave seismic uses the multicomponent receiver that records both of vertical component and horizontal component. The vertical component is assumed to correspond to the compressional PP wave and the horizontal correspond to the PS converted-wave. In this research, a synthetic model with the shallow gas and the salt dome below are constructed. The purpose of this study is to analyze the brightspot due to the presence of shallow gas and its effect to the quality of PP and PS wave reflection below the gas zone. To achieve the goal, both vertical and horizontal seismic data processing are performed. In horizontal data processing, the best gamma function (Vp/Vs) value is estimated to produce the better and reliable image. The result shows that the brightspot response in conventional data doesn’t exist in converted-wave data and the imaging below the gas zone in converted-wave data is better than the conventional due to the attenuation and diffraction effect that caused by gas column. Processing is followed by AVO analysis to compare the AVO response of PP and PS data in characterizing gas reservoir. Both PP and PS AVO curve shows the consistency with synthetic AVO from well data. Gas reservoir is a class 1 AVO anomaly with positive intercept and negative gradient on PP data. However, PS AVO curve does not refer any anomaly. It is because S-wave is not sensitive to the existence of rock saturant.

Geophysics in the high school STEM setting

2019 ◽  
Vol 38 (11) ◽  
pp. 873-877
Author(s):  
William Doenges ◽  
Sydney Potts ◽  
Christopher Rathman ◽  
Cody Winters ◽  
Warren Neff
Keyword(s):  
High School ◽  
Compressional Wave ◽  
Independent Study ◽  
Ocean Bottom ◽  
Science Fair ◽  
Converted Wave ◽  
New Science ◽  
School Year ◽  
Seismic Acquisition ◽  
Design For Science

In 2014, Bartlesville High School in Bartlesville, Oklahoma, USA, started an advanced math applications class as part of its new science, technology, engineering, and math (STEM) program. Selected exploration geophysics topics were incorporated as part of the class. Four of the class students in the 2017–2018 school year completed independent study of various topics in seismic acquisition design for science fair projects. The contents of this paper are the findings of those science fair projects. Contents include generating evenly distributed fold for compressional wave surveys (P-P), evenly distributed fold for converted-wave surveys (P-S), evenly distributed fold for ocean-bottom-cable/seismometer surveys (P-P), and offset/depth relations for validity of using the asymptotic approximation for converted-wave surveys (P-S).

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