Land Seismic Survey Design

By: Paul Ras



Instructor

Mr Paul Ras
(SD2I Geophysical Consulting, Netherlands)

Duration

1–3 December 2021:
9:00AM-1:00PM CET
4 hours/day

Disciplines

Geophysics – Seismic Acquisition

Level

Intermediate

Language

English

EurGeol

6 CPD points



Keywords

3D BROADBAND IMAGING INTEGRATION INVERSION LAND SEISMIC MODELING NOISE SENSORS SIGNAL PROCESSING SIMULTANEOUS SOURCE VIBROSEIS WIDE-AZIMUTH


Course Format

The EAGE Interactive Online Short Courses bring carefully selected courses of experienced instructors from industry and academia online to give participants the possibility to follow the latest education in geoscience and engineering remotely. The courses are designed to be easily digested over the course of two or three days. Participants will have the possibility to interact live with the instructor and ask questions.



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Course Description

This course presents an integrated approach to modern land 3D seismic survey design as it has a key role in the seismic value chain going from acquisition to processing, imaging and inversion & characterization. It will describe the main technology advances in land seismic acquisition: high-channel count single sensor (point receiver), simultaneous source high-productivity vibroseis, broadband and wireless nodal systems. New acquisition technology has in turn inspired progress in processing, imaging and inversion & characterization. Seismic survey designs have changed accordingly, wide azimuth high-density surveys are now the norm in many environments. And the survey design workflow now includes single sensor, single source, simultaneous source, broadband, symmetric sampling, cross-spreads, spatial continuity and more powerful 5D interpolation methods. It has also become more integrated, with requirements from processing, imaging and inversion & characterization feeding back to the design and hence acquisition.



Course Objectives

The purpose of this course is to understand:

  • Understand the main parameters related to land survey design;
  • Understand the generic land seismic survey design workflow;
  • Understand the impact of the new acquisition technology on survey design;
  • Understand how design and acquisition affects processing, imaging and inversion and characterization.


Course Outline

  1. Introduction: setting the stage discussing the survey design process as part of the seismic value chain and from the perspective of integrated project design;
  2. Survey design workflow: generic survey design workflow introducing the basic design parameters and explaining how they are estimated. Among other things this involves survey objectives, resolution, signal and noise. In the next sections, we will show the impact of the new technologies;
  3. The advent of high-channel count systems has enabled single sensor (or point receiver) recording. This can provide unaliased sampling of signal and noise enabling easy removal of in particular near surface source generated noise;
  4. Simultaneous source hi-productivity vibroseis: acquiring data from multiple (groups or single) vibrators simultaneously from different source locations, which can improve spatial sampling and reduce cost by increasing productivity;
  5. Broadband: driven by imaging and inversion requirements, there has been a major technology effort to increase bandwidth, mostly on the low but also on the high frequency side of the spectrum;
  6. Wireless nodal systems significantly improve operational flexibility in restricted areas, increasingly being used with single sensors. Nodal technology is developing fast with higher channel counts while improving Wifi & Bluetooth technology enables better QC;
  7. The impact of survey design at the data processing stage includes receiver sampling for adequate noise suppression, improved source sampling for well sampled gathers (cross-spread, source, receiver) and fold (trace density). When we design the survey, we can for instance ensure well interpolated & regularized input to imaging, understanding of multiple behaviour, and enable good surface wave inversion for near surface modeling;
  8. At the imaging stage we should ensure spatial continuity, good spatial sampling (CMP bin), trace density, azimuth/offset sampling for azimuth preserving OVT migration, sufficient migration aperture and bandwidth. We can model for good illumination;
  9. To ensure optimum inversion – in particular pre-stack and AVOAz – and reservoir characterization, wide azimuth, high-density survey designs can provide good azimuth/offset sampling and S/N. Low frequency data (broadband) will reduce the dependency on well data, high frequency data and good spatial sampling will optimize resolution;
  10. Finally, there will be a quick look at some future developments like ongoing research efforts in the area of vibroseis sources, simultaneous sources and compressive sensing.

Participants' Profile

Acquisition geophysicists who are naturally involved in survey design but also processing geophysicists and interpreters who wish to understand how acquisition programmes can be tailored to tackle their problems. The course may also be beneficial to geoscience (geophysics and geology) students.



Prerequisites

Participants are assumed to have basic knowledge of seismic acquisition and processing techniques.



About the Instructor

Mr Paul Ras

With more than 20 years industry experience principally with Schlumberger, Paul Ras has worked in land seismic acquisition, survey evaluation & design, data processing, inversion & reservoir characterization. He is currently a geophysical consultant based in the Netherlands, teaching and consulting for Schlumberger NExT and working with geophysics startups.
Paul began his career at TNO Institute of Applied Geoscience and Delft Geophysical in the Netherlands, working in software development and as a seismologist on field crews. He then worked in various roles for Geco-Prakla, on crews and in the survey evaluation and design group.
After a three year secondment at Saudi Aramco followed by starting up WesternGeco’s data processing center in Saudi Arabia, he moved to inversion and reservoir services working for Schlumberger’s DCS segment based in Cairo. Then came various technical and project management roles mainly involving new technology like the land UniQ acquisition system, land demultiple processing and seismic guided drilling. From 2013 until 2015 he worked as a land area geophysicist for WesternGeco based in the UK.
Paul is a graduate in Applied Geophysics from Delft University of Technology in the Netherlands.





EAGE supports its members and the Geoscience community in general by offering a 35% discount on the regular prices for our Interactive online short courses during these difficult times.

Registration Fees

Registered and Paid Until 23 November 2021 From 24 November
Education Package 1 Credit 1 Credit
EAGE Member Price €180
€230
Non-Member Price €250 €300
*Non-Member price for this product does include EAGE Membership




Economic Hardship Program

EAGE also aims to assist its long-term members who are currently unemployed by offering a contribution towards educational programmes. Members who meet the requirements of the programme can attend any EAGE course for a discounted fee equal to €75. Click here to read more and apply.


Cancellation and Changes Policy

Registration fees will be refunded as follows:
  • Cancellation received before 17 November 2021: Refund will be processed after the event had ended. Amount will minus an administration fee of €35 per person.
  • Cancellation received on or after 17 November 2021: No refund will be made.
  • Transferring of your registration to another participant will cost €35, as administration fee, plus any differences in delegate types, where applicable (for instance when changing a registration from a member to a non-member).
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