3D Facies Modelling project using Petrel software. Msc Geology and Geophysics
Abstract
The Montserrat and Sant Llorenç del Munt fan-delta complexes were developed during the Eocene in the Ebro basin. The depositional stratigraphic record of these fan deltas has been described as a made up by a several transgressive and regressive composite sequences each made up by several fundamental sequences. Each sequence set is in turn composed by five main facies belts: proximal alluvial fan, distal alluvial fan, delta front, carbonates platforms and prodelta.
Using outcrop data from three composite sequences (Sant Vicenç, Vilomara and Manresa), a 3D facies model was built. The key sequential traces of the studied area georeferenced and digitalized on to photorealistic terrain models, were the hard data used as input to reconstruct the main surfaces, which are separating transgressive and regressive stacking patterns. Regarding the facies modelling has been achieved using a geostatistical algorithm in order to define the stacking trend and the interfingerings of adjacent facies belts, and five paleogeographyc maps to reproduce the paleogeometry of the facies belts within each system tract.
The final model has been checked, using a real cross section, and analysed in order to obtain information about the Delta Front facies which are the ones susceptible to be analogous of a reservoir. Attending to the results including eight probability maps of occurrence, the transgressive sequence set of Vilomara is the greatest accumulation of these facies explained by its agradational component.
5. •Location
LópezBlanco M. (2012)
NE Spain, South-Eastern part of Ebro basin1.-Introduction
1.2. Geological Setting
•Characterization
Average of sediment thickness about 1000 m
Areal extension
SLM: 350/450 km2
Monts: 100/150 km2
15. 2.2. FaultModelling
Basement thrusts
“Elsbrucsthrust sheet” SW 18º towards the south
“Les Pedritxes” SE 12º towards the South East
2-. Methodology
Hanging wall Surfaces
Footwall Surfaces
“Elsbrucs”
“Les pedritxes”
34. 4-. Conclussion
•Workflow applied is a good approximation to the reality
•The treatment of the final model have provided indications about the place where the DF concentration is maximum
•Scale of work linked to the exploration one
•HC could be trapped at the dead-ends in the depositional pinch- outs of the fan-delta front wedges. (Cabello, P., López-Blanco, M., Howell, J., Arbués, P., Ramos, E. 2009)
•Model suitable to be analogue of similar subsurface geological bodies
Further Work
35. 5-. References
[1]Cabello,P.,Falivene,O.,López-Blanco,M.,Howell,JohnA.,Arbués,P.,Ramons,E.(2011).Anoutcrop-basedcomparisonoffaciesmodellingstrategiesinfan-deltareservoiranaloguesfromtheEoceneSantLlorençdelMuntfan-delta(NESpain).Pet.Geocience,Vol.17,pp.65-90.
[2]Cabello,P.,López-Blanco,M.,Howell,J.,Arbués,P.,Ramos,E.(2009).Modellingfaciesbeltdistributioninfandeltascouplingsequencestratigraphyandgeostatics:TheEoceneSantLlorençdelMuntexample(Ebroforelandbasin,NESpain).Elsevierltd.MarineandpetroleumGeology.
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5-. References
37. [11] Sech, R.P., Jackson, M.D. & Hampson, G.J. 2009. Three-dimensional modelling of a shoreface- shelf parasequencereservoir analog: Part 1. Surface-based modelling to capture high-resolution facies architecture. American Association of Petroleum Geologists Bulletin, 93, 1155-1181.
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5-. References