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Time-lapse (4D) seismic interpretation methodologies based on kriging analysis : application to the Senlac (onshoreCanada) and Marlim ( offshore Brazil) heavy oilfields

Abstract : This thesis research aims at investigating seismic interpretation methodologies and techniques that will help on better characterizing time-lapse, or 4D, seismic signatures. These techniques and methodologies are used to evaluate the time-lapse repeatability and then to filter out undesirable artefacts that are non-related to the production, while enhancing the 4D signature. To achieve these goals, a methodology based on geostatistical tools, was developed. Typically, at least two time-interval windows are considered: one above and the other comprising the reservoir of interest. A statistical and variographic analysis, conducted on both windows and on all surveys, leads to an interpretation step where common or independent structures -in the variographic sense- can be pointed out. The structures interpreted as not related to the geology or to the production mechanism are filtered from the data by a multivariate factorial cokriging technique, based on the concept of Kriging Analysis developed by Matheron in 1982. Two real case time-lapse studies were used to test the methodology. The first case is a Canadian onshore heavy oil reservoir submitted to steam injection, where three different time-lapse surveys were shot to monitor the steam-chamber evolution. The noise present in the three surveys was first filtered using the technique described above; next, an unsupervised seismic facies analysis was conducted on both raw and filtered data in order to evaluate the filtering technique, and finally an interpretation, in terms of reservoir properties changes, of the time-shit observed between the campaigns was proposed. In the second case, the seismic data was acquired on a deepwater turbiditic oilfield from Brazil at two different times of reservoir life, before and after production and water injection. The two seismic surveys were filtered using the factorial kriging technique; the quality of the filtering was, in this case, evaluated by comparison with more common techniques
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Submitted on : Thursday, March 29, 2018 - 2:05:02 PM
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  • HAL Id : tel-01753028, version 1

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Carlos Eduardo Borges de Salles Abreu. Time-lapse (4D) seismic interpretation methodologies based on kriging analysis : application to the Senlac (onshoreCanada) and Marlim ( offshore Brazil) heavy oilfields. Earth Sciences. Institut National Polytechnique de Lorraine, 2008. English. ⟨NNT : 2008INPL012N⟩. ⟨tel-01753028⟩

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