Cross-Well Seismology: A New Production Tool

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

Indonesian Petroleum Association

... the depth of sources and receivers in both surveys. In laboratory studies Tosaya et al. (1984) have examined the change in compressional velocity...

A Quantitative X-Ray Diffraction Technique Applied to Fine-Grained Sediments of the Deep Gulf of Mexico

S. B. Devine , R. E. Ferrell, Jr., G. K. Billings

Journal of Sedimentary Research (SEPM)

... PERCENTAGE CALCULATIONS FROM X-RAY DIFFRACTION PEAK INTENSITIES Peak intensities were converted to mineral weight percentages by adapting the equation...

A Practical Review of Migration Issues and Solutions; #40723 (2011)

Ian F. Jones

Search and Discovery.com

..., the method of velocity model building must be tailored to the type of depth migration algorithm we intend to use. We nowadays commonly have available...

Travel-time tomography for joint velocity and transducer location estimation

Edan Gofer, Raanan Dafni, Albert Shalumov, Ramon Axelrod, Moshe Oziel, Pinny Chaviv

International Meeting for Applied Geoscience and Energy (IMAGE)

... and the observed arrival times is solely a function of the velocity error, 𝑗 𝑗 𝑟𝑖 = ∫𝑖 𝛿𝑢(𝑥1 , 𝑥2 , 𝑥3 )𝑑𝑠. (2) Equation 2 represents...

AAPG Memoir 76, Chapter 15: Forward Modeling of Log Response in Geopressured Formations Reveals Valuable Insights to the Various Pore-Pressure Prediction Techniques

J. C. Rasmus

AAPG Special Volumes

... of resistivity, density, gamma ray, and neutron log vs. depth Figure 1. Forward-modeled resistivity vs. depth for various pore-pressure equivalent...

Shale Gas OVT Seismic Data Prestack Trace-Gather Optimization Technique

Yusheng Zhang, Gang Yu, Xing Liang, Benjing Liu, Guangming Hu

Unconventional Resources Technology Conference (URTEC)

... makes the equation diffuse along the direction of reflections and terminate at the edge, then the information of continuous events is extracted. Linear...

Abstract: AVAZ Inversion for Fracture Orientation and Intensity: a Physical Modeling Study; #90187 (2014)

Faranak Mahmoudian and Gary F. Margrave

Search and Discovery.com

... equation 26. For a given offset and depth of the fractured layer, the primary ray-path is traced to determine the incident angle, using a PP raytracing...

Influence of Geological Factors on Longitudinal Seismic Velocities

B. B. Weatherby , L. Y. Faust

AAPG Bulletin

... of calcareous sandstones and shales is substantially higher than that of a normal sand-shale section. The effect of depth on the velocity of a given...

Nonlinear LS-RTM based on the seismic scale separation and full-wavefield multiparameter FWI

ystein Korsmo, Yang Yang, Nizar Chemingui, Andrey Pankov, Antonio Castiello

International Meeting for Applied Geoscience and Energy (IMAGE)

.... FWI can as well incorporate reflections, which allow velocity estimation beyond the penetration depth of diving waves. For this to be feasible...

Predicting S-wave sonic logs using machine learning with conventional logs for the Delaware Basin, Texas

Jaewook Lee, Yangkang Chen, Robin Dommisse, Alexandros Savvaidis, Guo-chin Dino Huang

International Meeting for Applied Geoscience and Energy (IMAGE)

... Velocity Prediction Figure 1. Bivariate correlation heatmap of five variables: S-wave sonic (DTS), P-wave sonic (DTC), gamma-ray (GR), density (ρ...

An Interpreter's Guide to Improvements in Depth Imaging Through Model-Based Velocity Estimation and Refinement

Andy Furniss

Indonesian Petroleum Association

... incorrect results as ray bending still occurs due to velocity variations within layers and at layer boundaries. The Dix equation itself is based on several...

Land seismic multi-parameter FWI imaging

Mason Phillips, James McLeman, Vlada Avramovic, Tom Rayment, Stuart Schmitt, Mike Varner, Yasser Khalifeh, Ahmad Ammar Chahine, Eskil Jersing

International Meeting for Applied Geoscience and Energy (IMAGE)

... the workflow. In parallel with the preprocessing, an initial velocity model was built using refraction tomography in the near-surface and smoothed depth...

A New Approach to Seismic Interpretation in Challenging Imaging Environments, by C. Edward Helsing and David C. Berman; #90052 (2006)

Search and Discovery.com

Orthorhombic Imaging for Orthogonal Wide Azimuth Surveys in Mississippi Canyon, Gulf of Mexico; #30391 (2014)

Yang He, Adam Gersztenkorn, Sherry Yang, Bin Wang

Search and Discovery.com

... as a linear equation system to minimize the residual moveout of gathers for all azimuths. Checkshots’ travel times can be used by ray tracing...

Velocity continuation with Fourier neural operators for accelerated uncertainty quantification

Ali Siahkoohi, Mathias Louboutin, Felix J. Herrmann

International Meeting for Applied Geoscience and Energy (IMAGE)

... accelerate velocity continuation, trading wave-equation solves for a simple neural network inference. This is of considerable importance...

Structure Interpretation Problems of a Lower Miocene Reef Associated with a Shallow Low Velocity Anomaly, North Sumatra

Peter Walker, Masrizal Maas, Michael D. Burnaman

Indonesian Petroleum Association

..., at the base reef level. These two phenomena, although unconnected are due to the ray path distortion caused by the presence of high velocity reef...

Abstract: Practical Implementation of Wave-Equation Datuming for Resolving Near-Surface Problems, by Khaled Al Dulaijan and Saleh M. Al-Saleh; #90105 (2010)

Search and Discovery.com

High-Resolution Anisotropic Earth Model Building on Conventional Seismic Data Using Full-Waveform Inversion: an Offshore Australia Case Study

Bee Jik Lim, Denes Vigh, Stephen Alwon, Saeeda Hydal, Martin Bayly, Chris Manuel, Dimitri Chagalov, Gary Hampson, Dimitri Bevc

Indonesian Petroleum Association

..., the initial starting model was derived from a smooth version of a reflection traveltime tomography velocity field derived from a depth migration workflow...

Abstract: Regular Grids Travel Time Calculation … A Practical Huygens Wavefront Expansion Approach; #90187 (2014)

Zhengsheng Yao, Mike Galbraith, and Randy Kolesar

Search and Discovery.com

... solution to the eikonal equation formulated in a ray coordinate system. Because it shares the information between rays, unlike ray tracing where...

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Ehsan, Athar

Search and Discovery.com

... and stratigraphic features. From the dispersion relation, grid sizes adapted to local velocity with depth, which not only simulated wavefields with higher...

Abstract: 3D Time Domain Full Waveform Inversion Based on Multiscale Adapted Variable Grid Method Case Study Majunga Basin East African Coast; #91204 (2023)

Mukiibi Ssewannyaga Ivan, Jian-Ping Huang, Zi-Ying Wang, Jidong Yang, Jin Keji

Search and Discovery.com

... is modified based on the following equation 𝑑𝑧 = (2) 𝑛𝑓 𝑑 Where 𝑓 𝑑 denotes the dominant frequency and 𝑣(𝑧) is velocity variation with depth...

Permeability prediction in chalks

M. Monzurul Alam, Ida Lykke Fabricius, Manika Prasad

AAPG Bulletin

..., doi:10.1144/1354-079306-707.Fabricius, I. L., L. Gommesen, A. Krogsboll, and D. Olsen, 2008, Chalk porosity and sonic velocity versus burial depth...

Petrophysical Relationship to Predict Synthetic Porosity Log; #41124 (2013)

Thariq Guntoro, Intan Putri, and Ayi Syaeful Bahri

Search and Discovery.com

... was estimated by Faust’s equation, a better result was obtained at a depth of 4,300 - 5,479 ft compared with the measured P-wave velocity. A good result...

Least-squares RTM with shifted total variation regularization for depth imaging of sparse short-offset seismic data

Toktam Zand, Andrzej Gorszczyk, Ali Gholami, Hasan Ghasemzadeh, Alison Malcolm

International Meeting for Applied Geoscience and Energy (IMAGE)

..., in order to account for multiples as signal rather than noise, we recursively update the migration velocity model in the frame of a non-linear migration...

Abstract: A Ray+Waveform Inversion for the Potency Tensor; #90187 (2014)

Scott Leaney and Chris Chapman

Search and Discovery.com

...se problem linear we presently consider an inversion for the potency tensor source described by equation 2. A hybrid linear+nonlinear inversion for pote...