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Seg Technical Program Expanded Abstracts | 2006

Diving-wave Refraction Tomography And Reflection Tomography For Velocity Model Building

Mehmet C. Tanis; Hemang Shah; Peter Watson; Mark P. Harrison; Sherman Yang; Lee Lu; Charles Carvill

Summary Trinidad and Azerbaijan offshore areas are strongly affected by shallow gas anomalies which greatly attenuate seismic signals. Building velocity models in such areas with shallow water depths and gas can be a difficult task. Here we present two alternative ways to build reliable velocity models in the presence of shallow gas; one that is suitable to very shallow (<100m) and poor data quality areas and the other for deeper water depths. In the first instance, we make use of Diving-Wave refraction tomography method to build shallow velocity models offshore Trinidad and Azerbaijan. Previous use of this method has been limited to processing seismic data to produce a shallow velocity model to determine static corrections in time processing. Our success is in using the velocity model derived from Diving-Wave tomography as a starting model for reflection tomography in depth processing. We show that Diving-Wave method is a robust technique that produces reliable near surface models in the presence of gas and in areas with low signal to noise ratio. In the second case, we show that where data has reasonable offset to work with, reflection tomography can produce fairly accurate and high fidelity velocity models that can be further improved with iterative migration velocity analysis. As a result, depending on available data quality, either Diving-Wave derived shallow velocity model or reflection tomography derived model can be used to improve the ultimate product from iterative pre-stack depth migration and reflection tomography.


Seg Technical Program Expanded Abstracts | 2007

Imaging Beneath Complex Layering: Processing Seismic Data With Complex Decomposition And Renormalization Group

August Lau; Cintia Lapilli; Juan Perdomo; Chung-Chi Shih; Sherman Yang; Alfonso Gonzalez; Luis Canales

Seismic Imaging beneath complex layering is challenging and problematic. Examples of complex layering are complex shale, carbonate, basalt and salt. Both the quality of the image and wavelet fidelity of the reservoir beneath the complex layering are usually not satisfactory below complex layering, largely because of the associated multiples and elastic waves. These effects interfere with the primary reflection. The problem is more acute for seismic reservoir analysis where agreement between observed logs data and seismic is important. Apache Corporation and WesternGeco undertook a Strategic Technology Alliance Project of a modeling study to investigate old and new seismic processing methodology. The purpose is to do an in-depth analysis of assumptions and approximations in the conventional seismic processes. The study identifies which of these programs are ineffective in the presence of interference due to strong interaction in the overburden. Then we can replace these programs with the new processing programs like complex decomposition and renormalization group.


Seg Technical Program Expanded Abstracts | 2012

Pore-pressure estimation ahead of the bit while drilling by seismic and well data integration

Cengiz Esmersoy; Yi Yang; Chirag Parekh; Marta Woodward; Konstantin Osypov; Sherman Yang; Yangjun Liu; Colin M. Sayers


Seg Technical Program Expanded Abstracts | 2002

Application of Vertical Velocity Analysis For a Vertically Transversely Isotropic Medium

Sherman Yang; Chung Chi Shih; Niranjan Banik; Jeff Chen; Ashish Banik; George Schultz


North Africa Technical Conference and Exhibition | 2013

Guiding Drilling by Look Ahead Using Seismic and LWD Data

Cengiz Esmersoy; A. Ramirex; Andrew Hannan; Lee Lu; Sharon Teebenny; Yi Yang; Colin M. Sayers; Chirag Parekh; Marta Woodward; Konstantin Osypov; Sherman Yang; Y Lui; Chung-Chi Shih; Andy Hawthorn; C. Cunnell; E. Shady; A. Zarhidze; A. Shabraw; Maurice Nessim


Beijing 2014 International Geophysical Conference & Exposition, Beijing, China, 21-24 April 2014 | 2014

Diving Wave Tomography and Reflection Tomography for Velocity Model Building of Complex Depth Imaging in Mountainous West China

Mingshui Song; Xiaowei Lv; Xiaoli Han; Dingxue Wang; Sherman Yang; Curtis E. Hinz


Beijing 2014 International Geophysical Conference & Exposition, Beijing, China, 21-24 April 2014 | 2014

High Resolution Depth Imaging for South China Sea

Donghong Luo; Ming Zhu; Wei Zhang; Ruiliang Wang; Xisheng Li; Huaiyan Xue; Jie Cui; Xiaolong Yao; Xue Lei; Chunduan Zhao; Sherman Yang; Curtis E. Hinz


Beijing 2014 International Geophysical Conference & Exposition, Beijing, China, 21-24 April 2014 | 2014

First application of seismic guided drilling technology in carbonate cave exploration of China

Xianghao Liang; Hongxiang Shi; Lijuan Zhang; Wensheng Duan; Guohui Li; Hui Zhang; Sherman Yang; Chirag Parekh; Curtis E. Hinz


Archive | 2007

ABSTRACT: TUTORIAL: IMAGING THROUGH SHALLOW GAS, DIVING WAVE

Brian Broussard; Luis Canales; Charles Carvill; Lee Lu; Juan Perdomo; Chung-Chi Shih; Sherman Yang; Peter Melville; Mehmet C. Tanis


Archive | 2007

TUTORIAL: IMAGING THROUGH SHALLOW GAS, DIVING WAVE REFRACTION TOMOGRAPHY FOR OFFSHORE TRINIDAD

Brian Broussard; WesternGeco Trinidad; Luis Canales; Charles Carvill; Lee Lu; Juan Perdomo; Chung-Chi Shih; Sherman Yang; WesternGeco Houston; Peter Melville; Mehmet C. Tanis; Bp Exploration

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Mehmet C. Tanis

University of Texas at Austin

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