The objective of such a study is to establish whether permanent monitoring methods can provide real time information so that the reservoir dynamic behavior and cap rock integrity issues on the field can be better understood and controlled. Furthermore such a study should try to estimate both the costs and the potential values generated by the application of a permanent monitoring system on a specific field.
OCTIO provides these services in close corporation with alliance partners. The companies have unique technologies with regards feasibility evaluations and monitoring techniques. Together this group has leading technologies within ray trace modeling, rock physics modeling, sensing systems for permanent monitoring, installation of such systems and operations.
An example workflow for a feasibility study is illustrated above
The first major task is to establish the configuration of an optimal monitoring system by ray trace modeling. The benefits of using such a monitoring system will be addressed and the benefits of installing a pilot will be evaluated. Finally, a presentation of possible routes ahead will be outlined.
Active monitoring with short interval repeats
The objective is to develop an optimum layout of the array and ascociated systems for short repeat interval 4D applications.
Furthermore; the study can include evaluation of the values to the client provided by such systems.
The work will incorporate the use of ray trace modeling software as well as rock-physics modeling to quantify possible 4D effects
Installation planning will cover such issues as, interface to existing infrastructure, handling of obstructions, geotechnical issues and sensor coupling, cable laying and trenching techniques and operational planning.
Passive monitoring for CapRock Integrity
The primary objective of such a monitoring effort is to provide early warnings and thereby avoid harm to the environment caused by leak to surface by injection of waste, produced water and associated oil or gas.
Such early warning can be provided by the use of passive seismic, listening to smaller seismic activities (microseismic events) caused by the injection process and optionally in combination with quick repeat 4D seismic surveys using a common acquisition system.
The purpose of the feasibility study is firstly to evaluate and find an optimum configuration for the seismic monitoring systems and secondly to assess the probability for a system to actually detect leaks to surface.
A feasibility study will use ray-trace modeling to optimize the array layout.
Based on previous acquired seismic data, event attenuation and noise conditions will be evaluated in order to indicate if possible microseismic events are detectable.