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A Unique Methodology for Sub Basalt Imaging-Case Study Brajesh Das and Mairaj Fatima SPIC,ONGC Introduction Mesozoic sediments trapped under Deccan basalt in the western flank of India have been a challenge for petroleum exploration. Analysing sub-basalt sediments by seismic surveys has always been a challenge due to the massive nature of basalt.
Sub-Basalt Imaging West of Shetland. In order to achieve sufficient bandwidth in areas where high frequencies are limited, it is necessary to extend the low frequencies. Lower frequencies are affected less by attenuation, and provide greater accuracy and stability for seismic inversion.
quence of basalt flows originating from a series of vents. The final site, Mountain Home, is located in a fault-bounded sed-imentary basin with both surface and buried basalt layers. Here, we discuss surface and borehole results using vertical seismic profiling (VSP) and surface seismic methods to show
Seismic properties of layer 2 basalts ... Daley et al., 2004], but seismic monitoring in basalt environments ... is more effectively used and behavior is more clearly linked to processing. A ...
Event-based sub-basalt imaging applied to marine seismic data from north of Shetland, UK. Norwegian Journal of Geology vol 88, pp 167-183. Trondheim 2008. ISSN 029-196X Seismic wave propagation in media with high-velocity layers (basalts) can be described as an interference of various events commonly referred to as wave types or modes.
guided the actual wide angle seismic data processing and achieved sub basalt seismic imaging. An Xueyong [9] and Zhao Jianzhang[10] put forward the suggestion of seismic acquisition survey parameters in view of the problems of the development of the surface layer and the superficial layer. She Deping [11] [12] using wave
Seismic imaging of sub-basalt sedimentary layers is difficult due to high impedance of the basalt layer, the roughness of the top and bottom of the basalt layer and sometimes the heterogeneities within the basalt layer. In this thesis we identify specific problems within the modern imaging technology which limit sub-basalt imaging. The basic
streamers for sub‑basalt seismic imaging To evaluate the optimal technique for imaging beneath a complex basalt layer, Robert Dowle,1* Fabrice Mandroux,1 Robert Soubaras,1 and Gareth Williams2 compare dense wide-azimuth and broadband towed streamer acquisition solutions when deployed in an experimental survey in the Faroe-Shetland Basin. A
presence of basalt flows covering potential hydrocarbon exploration targets. Such basaltic layers (up to several kilometers of stacked flows) create enormous problems for imaging underlying structures using conventional seismic acquisition and processing methods. Scattering from the
A specific case, which is of great interest to petroleum exploration companies, occurs on continental shelf areas where potentially hydrocarbon-bearing strata are overlain by extensive extrusive igneous rocks. In this situation, standard seismic processing is often unable to resolve the structure beneath such basalt layers.
2D Long Offset Data Processing for Sub Basalt 2 the large velocity contrast at the top-basalt boundary and the high impedance contrasts between the intra basalt layers, both causing the significant loss of seismic energy. To compensate for the energy loss, a low frequency source signal is .
Multifocusing Seismic Processing to Improve Poor Response Areas below Basalt Layers, Canadon Asfalto Basin, Argentina Conference Paper (PDF Available) · .
Integrated seismic and electromagnetic model building applied to improve subbasalt depth imaging ... hanced seismic data acquisition and processing or from other ... basalt layer, as well as the sediment and basement structures underneath.
Jan 12, 2017· GeoTomo's GeoThrust 2D/3D seismic data processing software is now a mature system -- it has been in use by major oil companies, national oil companies, and service companies for more than twelve years. GeoThrust's workflow architecture provides the full freedom and flexibility for the user to follow any desired processing sequence.
Effect of flood basalt stratigraphy on the phase of seismic waveforms recorded offshore Faroe Islands Juerg Schuler 1, Philip A. F. Christie2, and Robert S. White ABSTRACT The generation of short-period multiples between highly heterogeneous layers of basalt flows can strongly alter transmit-ted seismic wavefields. These layers filter and ...
A three step methodology was utilized to construct the image of sub-basalt sediments: 1) getting of the image and velocity model of the low-velocity sediments above basalt (including its top) by processing of the reflected waves at near-offset (0-6 km); 2) construction of the basalt layer model by reflected waves observed at far-offset (6-16 km ...
tional seismic processing, in which the goal is to create a seismic section for structural or n Single-layer acquisition geome-try, associated syn-thetic traces show-ing AVO effect of gas sand, and a multilayer geome-try. Synthetics show amplitude increas-ing with offset (deflections to the left becoming more negative). Although seismic coordinates
The Influence of Basalt Layers on Seismic Wave Propagation. basalt layer and secondly a multi-layered sequence with numerous lava flows ..... With the advances in seismic survey and processing techniques and the dis-. Get price; Sub-basalt imaging in the Faroe-Shetland Basin using ... - EMGS. of the basalt layer as well as sub-basalt strata ...
The model incorporates a 1.5-km-thick basalt layer overlying a 3.5-km-thick sedimentary section above basement. The sub-basalt sediments have a lower velocity than the layers above and beneath them. The arrivals of interest are the basalt re-fraction, the wide-angle reflection from the base of the basalt,
It is thus understandable that considerable time and effort is expended in any processing project on the final parameters of seismic display so as to satisfy the individual tastes of the interpreter. Such things as frequency content, gain, trace spacing, and type of display are all up for grabs (see "Displaying seismic .
In this paper we summarize the acquisition and processing of the multi-component seismic swath, and present observations on the integration of P- and S- waveform sonic logs with information from resistivity-based image logs to determine regional and local stress tensors and to improve identification of subsurface basalt lithofacies. 2. Seismic ...
Layers of basalt flows within sedimentary successions (e.g. in the Faeroe-Shetland Basin) cause complex scattering and attenuation of seismic waves during seismic exploration surveys. Extrusive basaltic sequences are highly heterogeneous and contain strong impedance contrasts between higher velocity crystalline flow cores (̃6 km s-1) and the lower velocity fragmented and weathered flow crusts ...
We have basalt layer seismic processing,Basalt Layer Seismic Processing This thick basalt layer obscures the deeper potentially prospective sedimentary section This is one of the most important aspects of subbasalt seismic processing Velocity picks must take into account the geological model and be guided by the seismic interpreter Top basalt is an obvious seismic pick and further picks should ...
Improving Seismic Data Quality by Reprocessing and Redesign of a 3D Survey in an Area of Chaotically-scattered Source-generated Noise ... the strength of the primary wavefield that transmits downwards through the layers of basalt is dramatically reduced due to the strong reflectivity of the basalt layers. ... He started processing in the early ...
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