As a result, these multiples are removed before the imaging procedure in conventional seismic data processing. Seismic wavefield data is recorded by seismic multi-component receivers, the data having measurements relating to pressure (p) and velocity (v, v, v) components of the wavefield. Within this paradigm, accurate removal of free-surface and internal multiple reflections is required in the data preprocessing steps. The key feature of our construct of internal multiples is the introduction of the concept of virtual seismic events. He joined KOC in 1995 and is currently responsible for seismic data acquisition and processing. For the exploration of oil and gas reservoirs, multiples can be one of the main problems in applying the seismic method, especially in a marine environment. multilayer perceptron neural networks. Later in the life of a field, seismic data may be revisited to answer questions about fine-scale reservoir architec-ture or fluid contacts, or may be compared with a later monitor survey to infer fluid … Shallow hazard identification and multiple removal throughout the seismic section are additional benefits of using SWIM. data. The root of the problem is that current seismic processing techniques for multiple suppression are not fully effective. Multiples and primaries can often be separated with less ambiguity on CMP gathers (during velocity analysis) than they can be after stack. Imaging using sea-surface reflections improves the illumination and resolution of shallow subsurface targets when … Multiple attenuation methods include F-K filter, Radon transform, and Surface If you continue without changing your browser settings, you consent to our use of cookies in accordance with our cookie policy. 24, No. The method involves choosing a component of the wavefield and selecting two or more components of the wavefield data necessary to attenuate multiples in the chosen component. A technical blog about seismic data processing (powered by GLOBE Claritas) Thursday, 23 January 2014. Short-period multiples attenuation is a difficult problem for shallow water marine seismic data processing. Internal multiples were detected and attenuated using data-driven methodology of extended internal multiple prediction (XIMP). Misinterpreting a multiple for a primary or vice versa can easily lead to an invalid play for a mapped prospect. Examples. Research Paper | Geophysics | Nigeria | Volume 6 Issue 10, October 2017. Usually long-path multiples have traveled more in the slower (shallower) part of the section than primaries with the same arrival time, so that they ordinarily show more normal moveout and can be attenuated by common-midpoint stacking.[1]. The marine algorithm assumes that the sources and receivers are located in the water column. The application of these techniques to data from the Timor Sea is presented as a case study. Narrow-Azimuth Field Data Application. By closing this message, you are consenting to our use of cookies. Reducing multiple contamination in data is one of the greatest challenges in seismic processing, and no single approach is suitable for all scenarios. Removes multiples while protecting primaries. Schematically, moveout and predictability are Sheriff, R. E; Geldart, L. P (August 1995). Multiples in Marine Data Butler et al. In this study, we present a comparison of these three methods for attenuating free-surface multiples energy in short-offset 2D seismic data from Cendrawasih Bay. Seismic data are usually contaminated with noise, which refers to any unwanted features in the data. This has ledto the misconception that multiplereflectionsare only a problem withmarinedata. A neural network is trained with modeled data that are generated from well-log … You can disable cookies at any time. These events must be eliminated from the recorded section in order to allow a better understanding of the geology of the area. Detailed Surface Multiple Prediction Using Split-spread Broadband Seismic Marine Data in a Complex Sea Floor Environment . Another approach is to assess the surface seismic data for events that track in a similar manner. These event labels depend on the choice of primary velocity function and the pre-processing leading up to velocity analysis. We now examine the various types of multiples in recorded marine data in different domains — shot records, common-offset sections and CMP gathers. In recent years, several methods have been developed to attenuate seafloor multiples in seismic data, and a broad literature on this subject is available. Abstract: Multiple reflections in seismic data are generally considered to be unwanted noise that often seriously impedes correct mapping of the subsurface geology in search of oil and gas reservoirs. Seismic Multiples: Ghosts of the seabed Ghost 1 Ghost 2. A. Pica 1 R. Sablon J. Deprey S. Le Roy 2 R. Soubaras M. Chambefort G. Henin V. Danielsen E. Dhelie J. However, much information is gained during the pre-stack processing phase and this information can be made available to the interpreter in a simple way. 3-4, pp. Identifying Multiples on Seismic Sections. The method includes selecting a subset from a set of regularly sampled seismic data based on a low-discrepancy point set. Direct inversion using reflection data measured at one side of the target in 1D is possible for infinite bandwidth data, which is not available in measured seismic data. Seismic interpretation in areas such as the one illustrated here can be severely jeopardized by the presence of short period multiples which are extremely difficult to identify. Multiples suppression is an eternal topic in marine seismic data processing. Marine seismic data is generally acquired by towing source and receiver arrays through the water, periodically generating an acoustic pulse and recording the echoes reflected back from the sub-sea layering. multiples in the surface seismic data. Imaging can be achieved with alimited frequencybandwidthasavailable fromseismic datawith a Similar manner the previous shot internal multiples from deeper horizons are also addressed Propriétés Structure - Sensoriel primary! 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