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Well Tie Challenges in Southern Chad
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
This paper explores the impact of near surface noise on the ability to perform synthetic well ties to 3D land seismic data over a producing field.We conclude it is essential to understand the content of a seismic stack before embarking on well ties. Even more critical when poor quality data allows for a multitude of plausible tie solutions. If a single reflection boundary dominates ones well tie, one must be very sure its angle dependent characteristics are understood. Far from being an academic exercise, the product of this work included substantially altered time-depth functions utilised in time-depth conversion. It subtly changed the assignation of many critical surfaces in a field that consists of multiple stacked producing units. It altered our understanding of the phase of the seismic data. It also set hard limits on which reservoir properties could plausibly be derived from the seismic data in its current form whilst hinting that if the near surface induced noise could be effectively treated, lithological characterisation from seismic data is technically possible.