Re-saturation targets identified from 4D seismic softening responses in the Forties Field
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Published:January 01, 2018
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CiteCitation
Lyndsay Singer, Grant Byerley, Phil Rose, 2018. "Re-saturation targets identified from 4D seismic softening responses in the Forties Field", Petroleum Geology of NW Europe: 50 Years of Learning – Proceedings of the 8th Petroleum Geology Conference, M. Bowman, B. Levell
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Abstract
A novel 4D methodology by targeting softening responses, a decrease in impedance over time, is described from the Forties Field. It is demonstrated that these anomalies identified areas where oil had re-saturated previously swept rock. When first observed in some of the older vintages of 4D data, softening responses were dismissed as side lobes of underlying water-swept reservoirs. With improved 4D data quality, softening responses were seen to be clearly responding to an acoustic softening effect isolated in the reservoir. Pressure measurements ruled out hypotheses of gas exsolution or geomechanically induced dilatation of the overlying shale.
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Contents
Petroleum Geology of NW Europe: 50 Years of Learning – Proceedings of the 8th Petroleum Geology Conference
GeoRef
- Atlantic Ocean
- Cenozoic
- drilling
- Forties Field
- four-dimensional models
- geophysical methods
- geophysical surveys
- natural gas
- North Atlantic
- North Sea
- oil and gas fields
- Paleocene
- Paleogene
- petroleum
- petroleum exploration
- saturation
- seismic methods
- surveys
- Tertiary
- central North Sea
- Forties Sandstone Member
- Charlie Channel Complex