3D OBC seismic survey parameters optimization offshore Abu Dhabi

Ishiyama, Tomohide; Painter, D.; Belaid, K.

doi:10.3997/1365-2397.2010025

Cited by 6 publications

(5 citation statements)

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“…This agrees with a well-known trend in the relationship between acquisition effort and data quality: The data quality increases with the acquisition effort in general, and the data quality eventually reaches a plateau even with increasing the acquisition effort (e.g. Ishiyama et al, 2010).…”

Section: Relationship Between Acquisition Productivity and Processing...supporting

confidence: 89%

Blended acquisition with temporally signatured/modulated and spatially dispersed source array: The first pilot survey onshore Abu Dhabi

Ishiyama

2023

Geophysical Prospecting

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Recently, we established a blended‐acquisition method: temporally signatured and/or modulated and spatially dispersed source array, namely S‐/M‐DSA, that jointly uses various signaturing and/or modulation in the time dimension and dispersed source array in the space dimension. We acquired and processed the first pilot program with our method onshore Abu Dhabi. In this paper, we review the resulting acquisition‐productivity enhancement in the time dimension, and discuss it in the space dimension as well. We then review the deblended‐data‐reconstruction processing followed by imaging processing, and discuss their performance and resulting data quality. We last establish a relationship between the acquisition productivity and the processing performance. We found that this method significantly enhances the acquisition productivity compared to conventional blending methods. For the processing performance, the deblended data can successfully be reconstructed from the blended data; afterwards, the subsurface sections can naturally be imaged from the deblended data. Furthermore, this method owns a relationship: the deblended‐data‐reconstruction performance increases with the acquisition time (i.e. the acquisition effort that is inversely proportional to the acquisition productivity) up to a plateau; the imaging processing improves the data quality as the flow makes progress, and eventually reach a high data quality after poststack processing, regardless of the acquisition effort.This article is protected by copyright. All rights reserved

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Section: Relationship Between Acquisition Productivity and Processing...supporting

confidence: 89%

Blended acquisition with temporally signatured/modulated and spatially dispersed source array: The first pilot survey onshore Abu Dhabi

Ishiyama

2023

Geophysical Prospecting

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“…The abbreviation "OR" stands for "orthogonal", and "AR" stands for for "areal". In the region, earlier studies suggested two attributes required to image the target reflectors (Ishiyama et al 2010c): a trace density, i.e., nominal fold per bin size, of about 1.5 /m 2 , and a maximum offset, i.e., half of a maximum aperture, of about 3800 m corresponding to a maximum inline offset of about 3200 m with the 85 % rule (Cordsen et al 2000). The acquisition geometries in Table 1 satisfy these criteria.…”

Section: A C a S E S T U D Y O F F S H O R E A B U D H A B Imentioning

confidence: 99%

“…Therefore, the survey design is highly flexible, allowing for a variety of acquisition geometries. Ishiyama, Painter, and Belaid (); Ishiyama, Mercado, and Belaid (); and Nakayama, Belaid, and Ishiyama () describe the comprehensive properties of and several options for a shallow‐water acquisition geometry. The relevant survey parameters are the four spatial sampling intervals and apertures of the template geometry, similar to those of marine and land seismic surveys (Vermeer ).…”

Section: Introductionmentioning

confidence: 99%

3‐D shallow‐water seismic survey evaluation and design using the focal‐beam method: a case study offshore Abu Dhabi

Ishiyama

Blacquière

2015

Geophysical Prospecting

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For 3‐D shallow‐water seismic surveys offshore Abu Dhabi, imaging the target reflectors requires high resolution. Characterization and monitoring of hydrocarbon reservoirs by seismic amplitude‐versus‐offset techniques demands high pre‐stack amplitude fidelity. In this region, however, it still was not clear how the survey parameters should be chosen to satisfy the required data quality. To answer this question, we applied the focal‐beam method to survey evaluation and design. This subsurface‐ and target‐oriented approach enables quantitative analysis of attributes such as the best achievable resolution and pre‐stack amplitude fidelity at a fixed grid point in the subsurface for a given acquisition geometry at the surface. This method offers an efficient way to optimize the acquisition geometry for maximum resolution and minimum amplitude‐versus‐offset imprint. We applied it to several acquisition geometries in order to understand the effects of survey parameters such as the four spatial sampling intervals and apertures of the template geometry. The results led to a good understanding of the relationship between the survey parameters and the resulting data quality and identification of the survey parameters for reflection imaging and amplitude‐versus‐offset applications.

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“…OVT is considered as useful approach to preserve and utilize azimuth information by producing single fold cubes consisting of traces with similar offset and azimuth distributions. Ishiyama et al, (2010) showed a relationship between OVT density defined by unit area over box size and data quality. Since azimuth and offset distributions are slightly different bin by bin even within the same tile, smaller tile sizes, resulting from dense source and receiver intervals, naturally introduce less spatial variation among bins in one tile.…”

Section: Geophysical Requirementsmentioning

confidence: 99%

“…Bouska (2009) successfully acquired a DS3 survey, where the shot separation was at a distance which allowed the two wavefields to be separated in processing without adversely affecting the geophysical objectives. Ishiyama et al (2010) discussed its applicability to OBC survey. Figures 2 and 3 show the concept of DS3 and DSVFFS.…”

Section: Mor=mi!mx=(xmaxi / Sli)!(xmaxx/rli)!(i/j) For Orthogonal Geomentioning

confidence: 99%

3D OBC Seismic Data Acquisition Productivity Enhancement

Nakayama¹,

Belaid²,

Ishiyama³

2012

All Days

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Ocean Bottom Cable (OBC) seismic survey has several technical advantages over conventional towed streamer technique. However, its usage is still limited as requirement of relatively large operational efforts likely results in more survey cost and duration. Moreover, OBC seismic operations could affect other field activities and multi-vessel operations required for OBC survey and longer survey duration potentially increase HSE risks in fields. Consequently, enhancement and optimization of OBC survey productivity is essential particularly in specific situations such as shallow water, congested producing oil/ gas fields (e.g. Offshore Abu Dhabi) and in environmentally restricted areas.Although several studies have been carried out to establish key parameters, designs and geometries for high OBC survey productivity, the current developments in the seismic industry technology and equipment are enabling to establish a variety of survey designs and geometries which were not feasible previously. Therefore, our study was conducted with the aim to analyze the impact of OBC Survey Designs / Geometries on productivity considering the current available equipment and technology and meeting the established geophysical survey objectives. Applications of dual source operations were also discussed by using two cases: (1) Distanced Separated Simultaneous Shooting (DS3); and (2) Dual Source Vessel Flip-Flop Shooting (DSVFFS). Dual source operations for both marine streamer and land cases have been well described whereas few examples of its applicability to OBC survey have been presented. In this paper, we described the impact of dual source operations on OBC survey efficiency and technical challenges determined from the relationship between OBC Survey Geometries/Designs and interference noise wave fields which have to be considered as more complex scenario than other types of surveys. We believe that the established new approach will assist to acquire future OBC survey with high productivity and in a very cost effective manner.

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3D OBC seismic survey parameters optimization offshore Abu Dhabi

Cited by 6 publications

References 0 publications

Blended acquisition with temporally signatured/modulated and spatially dispersed source array: The first pilot survey onshore Abu Dhabi

Blended acquisition with temporally signatured/modulated and spatially dispersed source array: The first pilot survey onshore Abu Dhabi

3‐D shallow‐water seismic survey evaluation and design using the focal‐beam method: a case study offshore Abu Dhabi

3D OBC Seismic Data Acquisition Productivity Enhancement

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