Premigration attenuation analysis and mapping to image domain by weighted migrations

Yonghe Sun, Chunling Wu, Mark Fan, Zhemin Tan

International Meeting for Applied Geoscience and Energy (IMAGE)

..., and 𝑡∗ ≡ ∫ 𝑟𝑎𝑦 𝑑𝑙 𝑣(𝑓0 ) ⋅ 𝑄 (5) is the attenuated traveltime. The attenuation effect on wave propagation is represented by the frequency-domain filter 𝑡∗ 𝑓 𝑡∗ F(f...

P-wave velocity inversion with average velocity analysis method

Yan Yuefeng, Jing Shaodong, Wang Yingwei, Zhong Chuhan

International Meeting for Applied Geoscience and Energy (IMAGE)

... part of the W-D curve is not sensitive to the P-wave velocity. The inaccuracy of the shallow velocity will affect the VSz and then change the W-D curve...

AAPG Memoir 76, Chapter 19: The Future of Pressure Prediction Using Geophysical Methods

Alan R. Huffman

AAPG Special Volumes

... there is essentially no porosity change, the net effect is to flatten out the velocity–effective-stress trend and produce an unloading Figure 1. Velocity...

Abstract: Cross-Validation of 3C and 9C Prestack Shear Wave Splitting Analysis at Big Sky; #90224 (2015)

Jeff P. Grossman and Gulia Popov

Search and Discovery.com

... A, the R component shows sinusoidal variation in traveltime with azimuth, while events on the T component change polarity every 90 degrees of azimuth...

Abstract: Anisotropic Frequency-Dependent Spreading of Seismic Waves from VSP Data Analysis; #90174 (2014)

Amin Baharvand Ahmadi and Igor Morozov

Search and Discovery.com

...-arrival travel times, we constructed a six-layer interval velocity model Figure 1: Vertical-component records from a near-offset VSP (Figure 2). To each...

Integrating Rock Physics and Borehole Seismic to Understand the Elastic Changes Associated with CO2 Injections: a REAL-LIFE Example from Southwestern Wyoming

Gabriela D’Aubeterre

Unconventional Resources Technology Conference (URTEC)

... proposed a workflow to integrate and gain value of current available borehole data, log, and seismic measurements (VSP) which has a positive impact...

Abstract: TTI Anisotropic Depth Migration: Which Tilt Estimate Should We Use?; #90211 (2015)

Francois Audebert and Volker Dirks

Search and Discovery.com

...-way traveltime along the normal ray, the apparent slowness (traveltime gradient) at the emergence point, and the apparent NMO velocity, Vnmo (related...

Cross-Well Seismology: A New Production Tool

B. N. P. Paulsson, R. T. Langan

Indonesian Petroleum Association

... Laboratory, March 1988) reported a successful attempt at imaging a 2% velocity change in a CO2 flood. Figure 6. The effect of temperature and degree...

Sonic velocity, submarine canyons, and burial diagenesis in Oligocene-Holocene cool-water carbonates, Gippsland Basin, southeast Australia

Malcolm W. Wallace, Guy R. Holdgate, Jim Daniels, Stephen J. Gallagher, Andrew Smith

AAPG Bulletin

... the effect of carbonate content at shallow depth. Virtually all wells with shallow sonic velocity data show a marked change in gradient at around 300-500 m...

Abstract: Practical Applications of Seismic Anisotropy; #90187 (2014)

Philip Wild

Search and Discovery.com

... information about the overburden that can be included in an anisotropic velocity model. For splitting of converted shearwaves, whether recorded by VSP or OBC...

Abstract: Seismic Detection of Cracks in Carbonates Associated with Potash Mining; #90171 (2013)

Zimin Zhang and Robert R. Stewart

Search and Discovery.com

.... We find that cracked rocks can display a significant velocity decrease for both P- and S-velocities. For aligned cracks, velocity anisotropy was also...

Three-Dimensional Seismic Analysis in the Characterization of a Giant Carbonate Field, Onshore Abu Dhabi, United Arab Emirates

Peter Melville, Omar Al Jeelani, Saeed Al Menhali, Jürgen Grötsch

AAPG Special Volumes

... into upper and lower units based on their depositional facies and reservoir properties, predominantly the change of permeability. Both units...

Abstract: Separation of Geometric Spreading, Scattering and Intrinsic Attenuation in VSP data; #90187 (2014)

Amin Baharvand Ahmadi and Igor Morozov

Search and Discovery.com

...Abstract: Separation of Geometric Spreading, Scattering and Intrinsic Attenuation in VSP data; #90187 (2014) Amin Baharvand Ahmadi and Igor Morozov...

Seismic land acquisition designed to identify geology and rock properties over stacked pay interval using HTD 3D3C survey in the Permian Basin

Bruce Karr, Andrew Lewis, Stephen Klug, Ron Bianco

International Meeting for Applied Geoscience and Energy (IMAGE)

... and PS surface seismic and VSP registration • PP and PS sampling of 10,000’ stacked petroleum system • Additional notes on acquisition Figure 1...

Integration of Multicomponet Surface Seismic, Multicomponent VSP and Microseismic in Reservoir characterization

Paul Constance, Jim Simmons, Shihong Chi, Lisa Sanford

Unconventional Resources Technology Conference (URTEC)

...-Wave Anisotropy: PS converted waves polarize parallel and orthogonal to fractures in the subsurface. The resultant effect is in velocity and polarization...

Petroleum Geologist and Exploration Geophysicist: Co-Ordination and Seismic Velocity

John D. Hale

CSPG Bulletin

... then are the subsurface geological anomalies that could effect an abnormal change in density of the subsurface formations, and what are the observed velocity...

Improvement of Seismic Tomographic Imaging by Downward Continuation and Modified SIRT

Teuku A. Sanny, D. Santoso, D. Dahrin, Fatkhan, Alfian B.

Indonesian Petroleum Association

... of the direct arrival traveltime tomography. But the tomography image fails when applied in an area that has a Low Velocity Layer (LVL) in the top of objective...

Influence of Lithology and Neogene Uplift on Seismic Velocities in Denmark: Implications for Depth Conversion of Maps

Peter Japsen

AAPG Bulletin

... from seismic maps, when velocity information is available from several wells. Velocity is the key in the conversion from seismic traveltime to depth...

Azimuthal Variations in Reflection Seismic Data: Measurements Governed by the In-Situ Horizontal Stress Field and/or Vertical Aligned Fractures

Heloise B. Lynn, Walter S. Lynn

West Texas Geological Society

... on their relative azimuths. The effect of the fractures and / or unequal horizontal stresses on the seismic signal depends on the relative scale length...

4D Passive and Aggressive Monitoring of Air Injection at Telephone Lake, Alberta; #80378 (2014)

Richard Pearcy and Larry Mayo

Search and Discovery.com

... arrival also showed a significant change in the velocity within the zone as the air was introduced. This velocity change resulted in a push-down effect...

Seismic Acquisition in the Papuan Fold Belt: A New Approach

G. S. Hill, S. J. Price, M. S. Foster, R. W. Stephenson, D. Ellis, J. A. Lyslo

Papua New Guinea (PNG) Petroleum Convention Proceedings

...) The flexibility to conduct tests, change acquisition parameters and even adjust the position of the line during operations. This was made possible by the use...

Case History of DAS Fiber-Based Microseismic and Strain Data, Monitoring Horizontal Hydraulic Stimulations Using Various Tools to Highlight Physical Deformation Processes (Part A)

Robert Hull, Robert Meek, Hector Bello, Douglas Miller

Unconventional Resources Technology Conference (URTEC)

... layers that would have created this effect here. Only at certain times in the progression of the pumping is there a step change in the strain allowing...

Abstract: Impact of Seismic Anisotropy on Predicted Reservoir Properties; #90254 (2016)

Duryodhan Epili, Husam AlMustafa, Asaad E. Alzawwad, Mohammad Bannagi, Mark Taylor

Search and Discovery.com

..., using anisotropic parameters derived from a walkaway VSP. The anisotropic velocity models produced a seismic depth image that calibrated to the well...

Fluid Substitution Modeling to Determine Sensitivity of Time-Lapse 3-D Vertical Seismic Profile Data to Injected CO

Search and Discovery.com

Revealing the discontinuities by 3D prestack diffraction separation and imaging

Chuangjian Li, Suping Peng, Xiaoqin Cui, Peng Lin

International Meeting for Applied Geoscience and Energy (IMAGE)

.... obtain the NMO velocity by the velocity analysis process; 2. calculate the corresponding midpoint and zero-offset traveltime of the sample point...