Natural fracture parameterization and connectivity in Rohtas Limestone, Vindhyan Basin, Central India

This work investigates the connectivity of subsurface natural fractures in the gas-bearing Rohtas Limestone of the Vindhyan Basin through discrete fracture network (DFN) modelling. Permeability in this ultra-tight reservoir is very low and the production of gas requires flow assistance through natur...

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Bibliographic Details
Main Authors: Sharma, Pranjal, Ghosh, Sayantan, Joshi, Nitin, Srivastava, Dilip Kumar
Format: Conference Proceeding
Language:English
Subjects:
Clusters
Connectivity
Fractures
Limestone
Natural gas
Parameterization
Reservoirs
Well drilling
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Summary:This work investigates the connectivity of subsurface natural fractures in the gas-bearing Rohtas Limestone of the Vindhyan Basin through discrete fracture network (DFN) modelling. Permeability in this ultra-tight reservoir is very low and the production of gas requires flow assistance through natural fractures. Two predominant fracture sets, i.e., NE-SW and NW-SE were modelled using ant-track images originally obtained from seismic data. The fracture intensity was found in the range of 0.4-0.47 fractures/m. The longest fracture (fault) lengths observed through ant track images was nearly 3200 meters for both fracture sets. Fracture lengths were shown to follow a lognormal best fit. Maximum fracture (fault) heights range 300-400 m. Fracture length and height were are linearly related. At default fracture intensity and size, the reservoir is connected through fractures. Using smaller fractures at lower intensities showed the existence of fracture clusters. Cluster count for smaller fractures is higher compared to larger fractures. The existence of fracture clusters beyond the seismic resolution indicates that complete reservoir connectivity to horizontal or vertical wellbores through sub-seismic natural fractures is unlikely.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0168892