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| Exploration |
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OIL’s systematic and scientific approach to exploration has been rewarded
with a high success ratio of 65% of exploratory wells drilled. OIL also possesses
2D and 3D seismic data acquisition capabilities, with excellent support services
ranging from satellite navigation systems to remote blasting units.
OIL owns a vast array of advanced computing systems and experienced personnel
to process and interpret geo-scientific data through integrated exploration applications
such as Remote Sensing, Structural and Stratigraphic Interpretation, Seismic Attribute
Analysis, Source Rock Evaluation, Biostratigraphy, Petrophysics, Sequence Stratigraphy,
Basin Analysis, Techno-economic Evaluation, etc.
Formation evaluation through an integrated approach of geological, geophysical,
geo-chemical and reservoir engineering studies has allowed OIL to develop and
exploit deep (3500-4700 m) thin sand prospects. Today, these reservoirs contribute
over 50% of OIL’s production. It is envisaged that the current introduction
of extensive 3D seismic will assist in reservoir management in both new as well
as ageing fields, heralding a new chapter in reservoir engineering studies.
OIL has so far acquired, processed and interpreted over 70,000 line km of 2D and
5,000 sq km of 3D seismic data in a variety of terrains, including hills, deserts,
rivers, marshes, etc.
OIL has pioneered the implementation of the concepts of modern reservoir management
in the Indian oil industry. Numerical reservoir simulation, introduced by OIL
in India for the first time in the early seventies, has remained its forte since
inception. Simulation has been used as an important tool for management planning,
production forecasting and decision making. Based on numerical simulation studies,
gas and water injection, and water and polymer flooding projects have been successfully
implemented in OIL’s fields, yielding recoveries averaging over 20% in excess
of the recoverable solely by primary depletion.
OIL has also developed special expertise in reservoir management of ageing fields.
Today, OIL has state-of-the-art numerical reservoir simulators with dedicated
workstations and a valuable knowledge-base to handle cost-effective reservoir
evaluation, development and management in all demanding environments.
An integrated database management system designed and developed in-house has been
extremely efficient in processing / analysing reservoir monitoring data. Apart
from routine activities for reservoir surveillance, many other operations such
as transient well tests, nodal analysis, collection of crude / condensate / gas
samples for PVT analysis, analysis of side-wall and conventional cores, etc. are
carried out as an integral part of reservoir management.
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