Previously undiscovered gas deposits have been found in a US onshore basin.
Operator Sacgasco found the four gas filled sand reservoirs in the Sacramento Basin’s Dempsey 1-15 well, onshore California, during field appraisal.
Dempsey is a large structure mapped with 3D seismic and interpreted by Sacgasco to have the potential to hold a prospective resource of over 1 Tcf of gas in up to seven stacked target reservoirs.
The well has reached the planned intermediate casing point and has been wireline logged.
The wireline and mud logs have confirmed four zones of interpreted gas saturated sandstones at field production levels at depths from approximately 1,000 metres (3,300 feet) to 1,560 metres (5,100 feet). Based on log correlations and 3D seismic, these gas filled sands have not been previously produced in this fault block of the field.
The net gas pay estimate from the logs ranges from 30 to 50 feet depending on petrophysical-parameter cut-off values used. These zones will now be protected behind casing for future testing and production.
As planned, 9 5/8″ casing has been run to a depth of approximately 1,760 metres (5,800 feet), and is currently in the process of being cemented in preparation for drilling ahead into more than five prospective underlying sandstone reservoir targets.
Joint venture partner Empyrean Energy (EME : AIM) welcomed the initial findings.
Empyrean chief executive Tom Kelly said: The early results are encouraging.
“It is pleasing to hear from the operator that it’s local team are confident that the gas zones discovered in the shallower zones of this well to date have the potential to provide enough cashflow to at least cover the costs of the well, which is exactly what we had hoped for from these shallower zones.
“This is excellent news in any well where you have shallow pay zones logged before you embark on the exciting drilling of significantly larger deeper primary prospects.”
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