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EAGE/SEG Research Workshop - Multicomponent Seismic - Past, Present and Future
- Conference date: 05 Sep 2005 - 08 Sep 2005
- Location: Pau, France
- Published: 05 September 2005
21 - 40 of 53 results
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Forseti - "Stealth" Imaging with 4C OBC Seismic
Authors T.D. Rape, A. Shatilo, X.G. Li, S. Oppert, K. Lewallen, D. Coney and K. EspejordA21 FORSETI - "STEALTH" IMAGING WITH 4C OBC SEISMIC Summary: 1 T.D. RAPE 1 A. SHATILO 1 X.G. LI 1 4 S. OPPERT 2 K. LEWALLEN 2 D. CONEY 3 K. ESPEJORD 3 1 ExxonMobil Upstream Research Co. PO Box 2189 Houston TX USA 77252-2189 2 ExxonMobil Exploration Co. 3 Esso Norge AS 4 currently IntSeis Inc. An ever-challenging goal of this industry is to extract as much useful information as possible from seismic data. Multicomponent seismic data present the opportunity to extract more information but of course it is more challenging to do so. There are many different applications
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Time Lapse Seismic Analysis Using Long Offset PS Data
Authors H. Mehdizadeh, M. Landrø, B.A. Mythen, N. Vedanti and R. SrivastavaA22 TIME LAPSE SEISMIC ANALYSIS USING LONG OFFSET PS DATA Abstract 1 A new time lapse seismic analysis method that exploits the high angle properties of PS reflected data is proposed. Many hydrocarbon fields are characterized by a significant increase in shear wave velocity at the top reservoir interface. If this increase is followed by a slight increase in P-wave velocity a well defined peak will occur for the PS reflection coefficient at high incidence angles. If the P-wave velocity within the reservoir layer changes due to production this will lead to a shift (with angle or offset) of this
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Multi-Component Seismic in Rough Terrain – An Example from Wyoming Green River Basin
Authors S. Ronen, C. Ansorger, M. Wagaman and M.L. JohnsonA23 MULTI-COMPONENT SEISMIC IN ROUGH TERRAIN: AN EXAMPLE FROM WYOMING GREEN RIVER BASIN Abstract 1 S. RONEN 1 C. ANSORGER 2 M. WAGAMAN 3 and M. L. JOHNSON 4 1 Veritas DGC Inc. 10300 Town Park Dr Houston TX 77072 USA EAGE/SEG Research Workshop – Pau France 5 – 8 September 2005 2 Veritas GeoServices 3 Veritas Land Surveys 4 ExxonMobil Upstream Research Company Test results indicate that single sensor three-component receivers provide better data than conventional groups of geophones in rough terrain. The images from the 3C data have better resolution and better imaging of dipping reflectors. Arguably the
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How Can We Unlock the Full Potential of Converted Wave Imaging?
Authors J.H. Kommedal and O.I. BarkvedA24 HOW CAN WE UNLOCK THE FULL POTENTIAL OF CONVERTED WAVE IMAGING? Introduction 1 JAN H. KOMMEDAL AND OLAV I. BARKVED BP Norge AS Godesetdalen 8 Stavanger Norway The introduction of high quality ocean bottom seismic equipment over the last decade has partly been driven by the need for C-wave imaging. However while a lot of progress has been made in improving OBS acquisition technology increasing numbers of receivers available for deployment and improving fidelity of the sensors there is a feeling that the quality of C-wave processing is still lagging behind. A possible reason for this may be lack
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3D High-Resolution Vp/Vs Inversion – Experiences from Recent Case Studies
Authors M. Nickel and L. SønnelandA25 3D HIGH-RESOLUTION VP/VS INVERSION: EXPERIENCES FROM RECENT CASE STUDIES Abstract 1 Recently we introduced a new scheme for 3D high-resolution vp/vs estimation by automating the PP PS event correlation process[1]. The scheme allows transferring the PS cube to the PP domain and thus enables a joint analysis of the data sets. Since event correlation is automated here the turn around time is significantly reduced and simultaneously precision is gained compared to the traditional horizon based manual approach. Furthermore the high-resolution vp/vs often lends itself as a lithology indicator. We will review the algorithm with respect to its robustness generality
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Benefits of 3D4C Surveys in the Caspian Sea
Authors R. Johnston, J. Bouska, T. Lyon and D. ManleyA26 BENEFITS OF 3D4C SURVEYS IN THE CASPIAN SEA Abstract 1 The first 3D ocean-bottom seismic (OBS) surveys in the Caspian Sea provide a new look at a complex geological region in terms of both P-wave and C-wave imaging. Novel acquisition design and a processing campaign spanning two years result in wide-azimuth P-wave images far superior to conventional narrow-azimuth towed streamer data. Wide-azimuth C-wave data provide a more reliable structural picture in places where distributed gas strongly affects the P-wave image. Wherever possible the processing has been designed to take advantage of the ocean-bottom setting and the acquisition design. Further
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Processing “Deep Water” 3D OBC Seismic Data at the Heidrun Field
Authors C. Hartline, D. Whitmore and S. ChiuA27 PROCESSING “DEEP WATER” 3D OBC SEISMIC DATA AT THE HEIDRUN FIELD 1 C. HARTLINE 1 D. WHITMORE 2 AND S. CHIU 2 1 currently ConocoPhillips P.O. Box 220 N-4098 Tanager Norway Summary In June 2003 the Heidrun Field partners completed acquisition of a 3D4C seismic survey in an attempt to provide better resolution of the field’s complex northern flank. The final PZ Kirchhoff pre-stack time migration was determined to be of lower quality than the 1986 3D streamer survey (reprocessed in 2001). The ConocoPhillips Subsurface Imaging and Prediction Group in Houston was requested by ConocoPhillips Norway to complete a
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Improved Sihil Image from 4C Full Azimuth Node Data
Authors E.W. Berg, M.V. Garcia, F. Maya, C.F.R. Torres, C. Vuillermoz and A. FyhnA28 IMPROVED SIHIL IMAGE FROM 4C FULL AZIMUTH NODE DATA 1 MARCO VÁZQUEZ GARCIA¹ FRANCISCO MAYA² CARLOS FEDERICO RUIZ TORRES² EIVIND W. BERG³ CLAUDE VUILLERMOZ³ & ATLE FYHN³ ¹Pemex CNPS Villahermosa ²Pemex Exploración y Producción Región Marina Noreste Ciudad del Carmen Mexico ³SeaBed Geophysical Trondheim Norway Summary A large 4C OBS seismic program was acquired for Pemex over the Cantarell field offshore Mexico to improve the structural definition of the deeper Sihil field underlying the giant Akal field. The acquisition was made using autonomous receivers planted with accurate positioning on a regular grid in the seabed. The data is acquired
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Anisotropic Analysis of 3C Data and Comparison to 9C Data
Authors J.E. Gumble, J.E. Gaiser and R.H. TathamA29 ANISOTROPIC ANALYSIS OF 3C DATA AND COMPARISON TO 9C DATA 1 J. E. GUMBLE 1 J. E. GAISER 2 AND R. H. TATHAM 1 1 The University of Texas Jackson School of Geosciences Department of Geological Sciences 1 University Station C1100 Austin Texas 78712-0254 USA 2 WesternGeco Denver CO 80202 USA Abstract Polarization analysis was conducted using both direct controlled source polarization shear wave (9C) data and converted shear wave (P-SV) data recorded for several source-receiver azimuths in both isotropic and anisotropic media. Anisotropic results are obtained using various methodologies including but not limited to four component rotation analysis
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PS-wave and P-wave Azimuthal Anisotropy in a Carbonate Basin
Authors B. Mattocks, D. Todorovic-Marinic, J. Li, S.L. Roche and S. Ronen1 A30 PS-WAVE AND P-WAVE AZIMUTHAL ANISOTROPY IN A CARBONATE BASIN B. MATTOCKS 1 D. TODOROVIC-MARINIC 2 J.LI 1 S. L. ROCHE 1 and S. RONEN 1 1 Veritas DGC Inc. 10300 Town Park Dr Houston TX 77072 USA 2 Veritas GeoServices Summary In an onshore example from a carbonate basin the cumulative PS-wave anisotropy is in good general agreement with regional horizontal stress from borehole breakouts and with symmetry plane orientations determined from azimuthal variations in the AVO gradient of the conventional P-wave 3-D survey. The embedded multicomponent test exhibits all the expected characteristics of converted waves in azimuthally
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Borehole Calibration of PS-Waves for Fracture Characterization – Pinedale Field, Wyoming
Authors J.E. Gaiser and R.R. van DokA31 BOREHOLE CALIBRATION OF PS-WAVES FOR FRACTURE CHARACTERIZATION – PINEDALE FIELD WYOMING Summary 1 J. E. GAISER AND R. R. VAN DOK WesternGeco 1625 Broadway Suite 1300 Denver Colorado 80202 USA Converted-wave (PS-wave) 3D surveys where downgoing compressional (P) waves convert to upgoing shear (S) wave reflections provide a practical means to obtain S-wave anisotropy attributes for characterizing fractures. This is particularly important for delineating naturally fractured reservoirs by exploiting the unique characteristics of S-wave splitting in azimuthally anisotropic media. An important aspect of this process that is often missing is to use borehole fracture information for calibrating the anisotropy.
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Improving the Definition of Shear Wave Splitting Attributes
Authors R.J. Garotta, P.Y. Granger and H. DariuA32 IMPROVING THE DEFINITION OF SHEAR WAVE SPLITTING ATTRIBUTES R.J. GAROTTA P.Y. GRANGER H. DARIU Abstract ������������������� ����������� � ���������� �� α �� ������ ����������� �� �� � � �� �� � ��� � α � �� ��� � ���α ���α � �� �� � ��� � α � �� ���� �� ���α ���α Fig 1a Fig 1b Figure 1: Radial and transverse acquisition coordinates and natural coordinates (1a) convolution operators resulting from travel through the anisotropic layer (1b) � 1 The effects of birefringence or shear wave splitting on a single raypath recorded with a good signal-tonoise ratio can
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Vp/Vs from Two Different Mode Converted Arrivals
Authors D. Ebrom, P. Heppard, M. Albertin, S. Viceer, P. Garossino and L. ThomsenA33 VP/VS FROM TWO DIFFERENT MODE CONVERTED ARRIVALS Abstract 1 Both the locally converted C-wave and the Purnell mode (S-wave) can be used to determine the Vp/Vs ratio beneath salt. These Vp/Vs ratios can be transformed into pore pressures to guide drilling activities. We forward modeled a generalized flat layered earth with a thick salt body in a deepwater setting. The reduced C-wave and Purnell mode traveltimes can be easily converted into Vp/Vs ratios when combined with the P-wave traveltime. The Vp/Vs so deduced from traveltime measurements is exactly correct only for an exactly vertical ray but acceptable (less than
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Documented Applications of S-Wave Data
By R.H. TathamA34 DOCUMENTED APPLICATIONS OF S-WAVE DATA 1 Introduction For the past twenty-five years seismic shear wave data have been sparingly applied in the petroleum exploration and production industry. Early applications required direct sources of shear-wave energy and thus data acquisition was generally limited to land locations. Further concerns about receiver coupling also limited recording of mode-converted shear waves from conventional sources to land environments. In recent years multicomponent seismic data acquisition has been successfully extended into the marine environment through 3C and 4C sea-floor recording using conventional airgun sources. These data have been quite effectively recorded and processing capabilities are
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Multicomponent Processing and Analysis of a 3D/9C Survey over an Algal Mound Carbonate Reservoir in the Paradox Basin – Roadrunner Field, Colorado
Authors R. van Dok, J. Gaiser, P. La Pointe and R. BensonA35 MULTICOMPONENT PROCESSING AND ANALYSIS OF A 3D/9C SURVEY OVER AN ALGAL MOUND CARBONATE RESERVOIR IN THE PARADOX BASIN: ROADRUNNER FIELD COLORADO Summary 1 The Paradox Basin in southwestern Colorado contains several isolated carbonate reservoirs created by algal limestone buildups. These algal mounds are relatively straightforward to locate on conventional P-wave seismic data. The reservoirs however are generally not internally homogeneous and ultimate recovery depends on locating zones of increased porosity and permeability. In 2003 a nine-component (9-C) 3-D survey was acquired over the Roadrunner Field in the Paradox Basin northwest of the town of Tawaoc (Figure 1) in order
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Imaging through Gas Using 2D-3C Data and Well Logs – Case Study from North Africa
Authors J. Brunelliere, A. Laake, T. Marples, E. Loubens and F. van KleefA36 IMAGING THROUGH GAS USING 2D-3C DATA AND WELL LOGS - CASE STUDY FROM NORTH AFRICA Abstract 1 Shear waves can help imaging through gas-filled sediments. Many offshore examples have been published (Granli et al. 1999; McHugo et al. 1999) whereas onshore case histories are rare. In this project from North Africa onshore converted waves were processed to image complex gas-filled zones. The first phase of the project was performed without available well data. This paper focuses on the two main challenges of this processing project: the noise attenuation process and the improvement of migration models using well velocities. It
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Vector Fidelity of Land Multicomponent Measurements in the Context of the Earth-Sensor System
Authors D. Burch, A. Calvert and J. NovakP01 VECTOR FIDELITY OF LAND MULTICOMPONENT MEASUREMENTS IN THE CONTEXT OF THE EARTH-SENSOR SYSTEM Summary 1 When land multicomponent seismic data are to be used to image converted wave energy or for shear splitting analysis the orientation of the three measurement directions must be known. Further the vector fidelity of these measurements should be high. In this context vector fidelity means that the vector motion of the sensor is correctly resolved along the three orthogonal directions of measurement and that the Earth near the sensor behaves according to a 1-D isotropic model. If either of these assumptions is violated estimates
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4D Rapid Turnaround for Permanent 4C Installation
Authors R.A. Clarke, O.J. Askim, K. Pursley and P. VuP03 4D RAPID TURNAROUND FOR PERMANENT 4C INSTALLATION Summary 1 We present a case study of using permanently installed ocean bottom cables and a small computer cluster on the platform to dramatically reduce turn around time for full depth migrated 4C4D volumes. We installed a small Linux cluster on the Valhall platform and used it to perform some preprocessing on the data as it was being acquired. The data were then compressed and transmitted to BP’s Houston high performance computing center for sorting and depth migration. One of the main ideas is that when the last shot in the survey
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Making the Business Case for Permanent Marine Multi-Component Systems
By M.H. HoustonP04 MAKING THE BUSINESS CASE FOR PERMANENT MARINE MULTI-COMPONENT SYSTEMS Summary 1 This presentation contrasts permanent multi-component systems with alternative marine acquisition methods and identifies key technical and economic tradeoffs for each technology. A simple production model demonstrates the role of investment production and 4-D attribution for pay-back from a permanent multi-component marine system. Sensitivity analyses on several investment and pay-back scenarios illustrate key business strategies for asset managers. Introduction Valhall installed in 2003 as the first permanent multi-component (PMC) system for acquiring repeated 4-D images has been a dazzling technical success. The system has demonstrated an ability to acquire
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Seismic Signatures of Two Orthogonal Sets of Vertical Microcorrugated Fractures
Authors R.F. Fuck and I. TsvankinP05 Abstract SEISMIC SIGNATURES OF TWO ORTHOGONAL SETS OF VERTICAL MICROCORRUGATED FRACTURES R. F. FUCK 1 and I. TSVANKIN 2 1 Reservoir Characterization Project Colorado School of Mines Golden CO 80401-1887 USA 2 Center for Wave Phenomena Colorado School of Mines Golden CO 80401-1887 USA Conventional fracture-characterization techniques operate with the idealized model of penny-shaped (rotationally invariant) cracks and ignore the roughness (microcorrugation) of fracture surfaces. Here we develop analytic solutions based on the linear-slip theory to examine wave propagation through an effective triclinic medium that contains two microcorrugated vertical orthogonal fracture sets in isotropic background rock. The corrugation of
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