Case Study: TenzorGEO

The Situation

Field production was behind the plan as no wells were drilled in the central part of the field. This was caused by concerns about potential low production volumes due to reservoir being a thick package of the Triassic-Jurassic sandstones, characterised by high reservoir heterogeneity, the presence of fractures and extensive zones of low permeability.

The Approach

FWL survey was conducted with the goal to identify areas of higher natural fracturing activity in the reservoir which are believed to provide sweet-spots for drilling and higher gas inflow rates. The project was completed in 5 months end-to-end. Calibration of FWL location system was undertaken using a string shot detonation in well 49 at the top reservoir.

A 3D cube of microseismic activity in the reservoir was obtained from the FWL survey, as well as maps of the total microseismic activity and a determination of the preferred direction of fracturing. The work was complicated by the presence of high-throw faults, depth of the target horizon and man-made noise from urban activity above the field.

Results

• Based on the findings, optimised positions for a new drilling program were identified (wells 1-6).
• Well 3 was drilled at the FWL recommended location during 2020 and flow rates that exceeded the flow rates of neighbouring wells were achieved.

KeyFacts Energy Industry Directory: TenzorGEO