... chalk layers with potential risk of dropfalls during installation, but also high strength clay layers and rock-type soils were encountered with potential risk of pile driving refusal conditions. To mitigate the risks related to installation of the monopiles, a number of measures were taken...

... Abstract We present results of the 4D seismic monitoring of the Ekofisk field waterflood. The thick, high porosity chalk reservoir compacts strongly in response to water injection 1,4,6 . This compaction has a clear effect on the 4D seismic data, which has a baseline 3D survey acquired...

.... evaluation reservoir description seismic data reservoir porosity loss reservoir characterization rock physics seismic simulation chalk phillips seismic response water saturation simulation upstream oil & gas ekofisk monitoring program seismic reservoir porosity saturation log analysis...

... and hydrocarbon kinetic modeling, would seem to imply that: the salt stock rose syndepositionally with sedimentation throughout Jurassic time, with the salt top maintained at the sediment/water interface; at Cretaceous time a competent chalk deposition terminated salt's rise; Miocene and later deposition...

... of compaction and surface subsidence that will occur in the life of the field. For this to be done accurately, there must be sufficient information to describe the compaction behavior of all the rock within the reservoir for all conditions encountered. The Ekofisk reservoir consists largely of chalk, a very...

... reservoir simulators used for reservoir management. Porosity distributions and geometrical features of the reservoir are based on porosity logs from some sixty wells drilled prior to the onset of significant compaction. Mechanical properties for the reservoir rock (chalk) are based on laboratory compaction...

... ABSTRACT In November 1984 Phillips Petroleum Company discovered subsidence of the seabed overlying the Ekofisk oil reservoirs offshore Norway. This phenomenon is the result of the compaction of the porous chalk reservoirs and the transmission of this compaction through the overburden...

... and the unconfined compression strength of the rock was developed considering the following sources of information: Experience with onshore bored piles in chalk in UK. Pile load tests on rock sockets and anchors in other weak rocks (eg mudstone). Laboratory tests on carbonate rock samples. Pile load tests...

... problems. The surface seismic is very difficult to process and it has been found impossible to pick the top of the reservoir under the gas cloud. Figure 2 shows a 30 fold migrated time section which is parallel to the walk away VSP &clearly shows the effects of the Gas Cloud. The Chalk Reservoir...

... are presented. For cemented sands, a review of results of load tests in cemented calcareous sand strata and chalk are presented. This data and information is used to appraise the existing design practice. This appraisal highlights the fact that existing practice is conservative for uncemented calcareous sands...

... ABSTRACT As offshore exploration moves into deeper waters fine-grained, nannofossil and microfossil-rich limestones (chalks) will be encountered more frequently. Analysis of petrographic and petrophysical data from onshore chalks in North America and Europe arid from subsurface chalks...

... ABSTRACT A detailed geotechnical investigation was undertaken at the Kinsale Head Gas Field in the Celtic Sea. Five-inch-diameter cores were recovered to a terminal penetration of 400 ft below the seafloor from two foundation borings drilled in a water depth of about 300 ft. Chalk extended...

... ABSTRACT Amoco International Oil Company has installed drilling and production platforms in a hard chalk formation in Rough Field, British Sector of the North Sea. A quasi-effective stress method was used to compute pile capacity in chalk and is presented. The computed capacity is compared...