Basement Fractures Forward Modelling Using Framework Model Derived From 3D Seismic Interpretation
Author: Annisa Indahvinaldi, Belmesty Kamila, Dody Apriadi, Fikri Muhammad Fiqih, Haryo Dwi Prabowo, Riky Hendrawan Bayu Pandito
Mapping fractures in basement plays important part in prospect maturation of fractured basement reservoir play. Several seismic attributes may portray any discontinuity features interpreted as fractures. However, the seismic-scale fractures would not be enough to explain the conductivity of the fractures, which is important to define it as a potential reservoir. Fracture modelling by applying certain geomechanics parameters as well as present day stress condition would be one of method to address the matter. This paper aims to predict the fractures distribution and its conductivity through Boundary Element Method (BEM) forward modelling in study case of South Sumatra Basin. The fracture modelling relies the most on the seismic interpretation of the high resolution and beam migration 3D seismic data. Horizon and faults interpretation were used as the mechanical boundary in this modelling. Total of 47 major and 122 minor faults were interpreted and used for the modelling. The simulated fractures resulted from the modelling then being further analyzed for its hydraulic conductivity through slip tendency approach. The fracture modelling result shows most of the fractures have the orientation of NE-SW. The modelling also shows the study area has pretty intense of deformation process resulted from the strain magnitude model. The slip tendency result shows most of the fractures are in the critically stressed condition or hydraulic conductive towards the present-day maximum stress condition. Last, certain areas can be defined as reservoir targets based on high value of strain magnitude and slip tendency.
Keywords: seismic interpretation, fracture modelling, boundary element method
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