Abstract

This paper presents a case study on the logistics and acquisition of a large, ultra high density and full wide azimuth 3D seismic survey across the Dukhan field for Qatar Petroleum (QP), Figure 1. This survey represents a step change in seismic data acquisition providing greatly enhanced data quality by full wide azimuth and very dense spatial sampling complemented by good quality uphole and simultaneous 3D Vertical Seismic Profile (VSP) recording. It is expected that this survey will set an industry standard for seismic acquisition leading to improved field redevelopment. While the 3D seismic data can always be re-processed in the future, it is possible that future re-acquisition of the entire Dukhan field area may be difficult or impossible to justify. Therefore one of the key driving principles behind the survey design was to ensure that QP did not under specify the source and receiver effort so that it represented a "no regrets" case for the future.

There are several key operational elements to this survey, the complexity of terrain which varies from sand, rock and sabkha to marine transition, busy infrastructure both residential and industrial i.e. townships, QP's oilfield installations and thirdparty quarries and factories. All of these operational elements must be managed successfully to achieve QP's technical objectives for high quality seismic data.

Introduction

The Dukhan field is a major oil field in Qatar discovered in 1939; it contains more than 350 wells producing from 4 major reservoirs. It has a complex history of production & development strategies, starting with natural pressure depletion for more than 20 years, followed by power water injection since 1989 and gas cap cycling since 1998. As with other large mature Middle East oil fields, Dukhan has also witnessed significant changes in technology over the last 60 years. In order to maximize the long term economic recovery from the field, QP is committed to applying leading edge but fit-for-purpose technologies. New, state of the art, 3D seismic data providing updated reservoir models will enable QP to continue the development of Dukhan field for many years to come.

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