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61st EAGE Conference and Exhibition
- Conference date: 07 Jun 1999 - 11 Jun 1999
- Location: Helsinki, Finland
- ISBN: 978-90-73781-10-8
- Published: 07 June 1999
81 - 100 of 502 results
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Removing Acquisition Pootprints in 3D Prestack Migration - an Example
Authors Y. Makovsky, A. Canning, E. Ragoza and A. GuchterCable feathering, the presence of drill rigs, and other reasons tnay cause irregularity in marine 3-D acquisition patterns.
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Optimising Acquisition Cost Effectiveness by Tailoring Parameters to Quality Objectives
Authors B. Vincent, I. S. V. Heckeler and W. ZhaoNow direct analytical measures on the seismic data during land operations is leading to greater understanding of the geophysical variation found within the survey area and the relative effects of acquisition parameter and overburden changes on this variation. This provides valuable input for optimising acquisition and data processing effort.
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Survey Design for Vertical Cable Seismic Acquisition
Authors C. Rodriguez-Suarez and R. R. StewartThe vertical cable recording geometry has shown considerable promise as a seismic acquisition technique. It is especially suitable for marine areas where any of the following are present: 1) obstacles (e.g. platforms or buoys) for a vessel towing streamers, 2) deep to very deep water, 3) a complex subsurface geology, 4) pipelines on the sea bottom, and 5) a hard (e.g., carbonate or basalt) sea floor.
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The Value of Near Field Hydrophone Measurements for Monitoring Source Signature Variations
Authors M. Brink, P. Sabel, S. Eidsvig, K. Kolbjørnsen and L. JensenThe emitted energy spectrum of the seismic source is a limiting factor for temporal and spatial resolution.
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On the lmprovement and Quality Control of the Trisor Source Signature Estimator
By M. SafarA quality control procedure is developed for the Trisor source signature estimator (SSE). The development of the quality control procedure is the result of a comprehensive evaluation of the performance of the Trisor SSE when first used commercially during Enterprise Oil Q15 3D survey carried out in August 1995.
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lmproved Noise Performance in Marine Hydrostreamers, Using a New Vibration Isolation Module
By J. LuscombeFor the towing speeds characteristic of marine seismic acquisition, the main source of hydromechanically-generated noise is axial vibration, transmitted to the active sections from the towing cable and from the tail buoy. In liquid-filled streamers, the axial vibration generates bulge waves, which are detected as noise by the hydrophones.
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Comparison of Single-Vessel Long Offset Acquisition
Authors R. Wombell, E. Jones, H. Jakubowicz, D. Emsley, P. Boswell and P. DavisAreas of the N.E. Atlantic margin are characterised by basalt flows. Unfortunately, for this area, standard offset ranges for seismic data (up to 6km) typically generate poor images of the base of the basalt and the sub-basalt geology.
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Flexibility and Stability of Streamer Shape Models
Authors E. Hupkens and A. FaichneyThere exists an ambiguity between flexibility in streamer models and stability of estimation procedures. The increase of the flexibility in the model leads to a loss of stability.
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Finite Element Analysis, a Tool for Geophone Design
Authors A. Stienstra and K. FaberThe distortion generated by geophones is a limiting factor in seismic data acquisition and there is a continuous search to improve the distortion figure.
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Marine Production Levels in Land 3D Seismic
Authors P. Burger, B. Duijndam and D. WasmuthImproving the productivity of Vibroseis seismic surveys has been a constant area of concern for geophysicists.
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Dualline Recording in the Overthrust Belts of South East Anatolia - a Case-Study
More LessTurkiye Petrolleri A.O. (TPAO) has several years of experience with acquisition seismic data from overthrust belt of South East Anatolia.
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Stress Sensitivity of Low-Frequency Compressional Wave Attenuation in Sediments
Authors C. McCann, J. Sothcott and S. MarksThe compressional- and shear-wave properties of seafloor sediments have a significant effect on the frequency bandwidth and spatial resolution which can be achieved in reflection seismic surveys.
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On the Prediction of the Elastic Properties of Shales
Authors M. Jakobsen and T. A. JohansenSuccessful seismic imaging of geological objects in the subsurface requires a knowledge of the acoustic properties of the overlaying strata.
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The Influence of Dolomite Genesis on Elastic Properties of Ordovician Carbonate Rocks in Estonia
By A. ShogenovaElastic properties of 170 Lower and Middle Ordovician rocks from Estonian Lower Palaeozoic sedimentary basin were studied together with chemical composition and analyzed using regression analysis.
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Abnormal Behaviour of Carbonate Rocks in Laboratory Saturation and Resistivity Tests
By L. KivekäsSaturation and resistivity measurements of some carbonate rock samples from the Tervola region, northern Finland indicated abnormal behaviour: the resistivity values of samples increased the higher the longer the samples were kept in water immersion.
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Magnetic Properties of Mesozoic Sediments Off Mid Norway - Distribution and Origin
Authors M. B. E. Mørk, S. A. McEnroe and O. OlesenMagnetic susceptibility has been measured on exploration sores and stratigraphic sores from the sedimentary section offshore Norway in northern North Sea and Norwegian Sea.
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Pseudo-Random Network Modelling of Electrical Properties of Natural Hematitic Sandstone
Authors M. M. M. S. Gornaa, S. A. Hussain, E. A. El-Diwany and A. El Rahim E. BayoumiA rock sample can be considered as a mixture of more than one constituent. Each constituent has its own electrical properties.
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Multivariate Analysis of Petrophysics and Petrochemistry of Nickel Deposits
Authors P. K. Jääskeläinen, R. Pietilä, A. Hattula and M. PeltoniemiThe most significant nickel deposits in Finland occur in Early Proterozoic Svecofennian magmatic formations.
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Non-Equilibrium Compaction and Abnormal Porefluid Pressures - Effects on Seismic Properties
Authors J. M. Carcione and A. GangiNon-equilibrium compaction or mechanical compaction disequilibrium is a consequence of a rapid deposition rate compared to the time required for expelling the fluids from the pore space by gravitational compaction.
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