In the upper part of this ekofisk tight zone some reworked layers may occur. Eldfisk field location map inset and top ekofisk formation. The fridge field is located astride the boundary that exists between norway and united kingdom in the northcentral part of the north sea at a distance of 200 kms west of haugesund, norway heritier, et al. Features graphics and simple fieldguide procedures to gu. Giant oil and gas fields of the decade 19681978 articlechapter. Trap source 60 ft thick layer separates the ekofisk from the tor kerogen. The age of the reservoir rock ranges from devonian to tertiary age with about 85% of the petroleum in rock adjacent to the cretaceoustertiary boundary, specifically the ekofisk formation of late cretaceous age. An atlas of hydrocarbon discoveries norwegian petroleum society, a. The 7 may 2001 induced seismic event in the ekofisk oil.
Cretaceous and tertiary chalk of the ekofisk field area. A few pages covering geologic maps makes sense for a field geology book with over 700 pages. The event was strongly felt on platforms and associated structures within the ekofisk oil field as ten seconds swaying and trembling. First of the giant oil fields in western europe subject group. The ekofisk field is a prolific field discovered in 1969 that is located inthe norwegian sector of the north sea. Geology and reservoir ekofisk industriminne ekofisk. This website is one result of the ekofisk industrial heritage project, pursued in two periods fra 2002 ti 2005 and from october 2018 to october 2019 to document the ekofiskarea on the norwegian continental shelf ncs. Minerals hardness 1gypsum, 2halite mineral 1 is harder or softer than a penny. Geologic significance of landsat data for 15 giant oil and gas fields1. Besides the ekofisk oil field, the statfjord oil field is also notable as it was the cause of the first pipeline to span the norwegian trench. Pdf characterization of dense zones within the danian chalks of. This book features 200 twocolor illustrations, graphs and tables, and covers key rudiments of geology.
The ekofisk field, evolution of the understanding of reservoir fluid flow controls. The natural fractures clearly control the permeability distribution, as the effective permeability can reach 50 md whereas the matrix permeability only ranges between 0. The ekofisk field is a central graben, northsouth trending anticline 49 km 2 19 sq mi in area, with 244 m 801 ft of vertical closure and a hydrocarbon column 305 m 1,001 ft long, formed by permian zechstein salt movement in the form of salt pillows. Beginning with a history of the earths formation and development, this book explores the substances that compose the planet, movements within the earth, the surface effects of weather and water, and underground landscapes.
The most complete ekofisk formation is found in the ekofisk field area in the norwegian sector. The ekofisk field, located in block 24 in the norwegian sector of the north sea, is formed from fractured chalk of the ekofisk and tor formations of early paleocene and late cretaceous ages, most of which had high initial porosity in the range of 3050%, but low permeability in the range 15 md. Written by a team of eminent geologists and educators, the field guide to geology, new edition features clear graphics and simple field guide procedures to guide hikers through the great outdoors. The production zones at a depth of about 3 km, include the paleocene ekofisk formation and the. Discover what earth science is all about with this popular book. The dashed line shows the estimated production limit. Pdf the ekofisk field is a giant field which has been producing at a high level. This is a very worthy addition and a real bargain given the material that it contains. Fossils gastropod gastropod ammonite echinid trilobite trilobite ammonite ammonite can you identify the fossils. Loaded with illustrations and fullcolor diagrams, photos, pictures, and sketches.
Pdf a holostratigraphic approach to the chalk of the north sea. Features graphics and simple field guide procedures to guide hikers through the great outdoors. The oil processed at eldfisk 27 ftp is sent to the ekofisk 24 j platform of the ekofisk centre from where it is piped to the receiving terminal in teesside. The geology and geophysics of the ekofisk field waterflood john brewster elf aquitaine narge, p. The introductory guide to the basics of geology and to collecting and identifying rocks.
It is 45 years since oil production started at ekofisk and norway thus became an oilproducing nation. It has a strong emphasis on examples from western canada. Eldfisk oil and gas field, north sea offshore technology. Discovery of the giant ekofisk field in block 24 in the norwegian part of the north sea in 1969 was a major turning point in the exploration for petroleum in western europe. Geo expro the first commercial north sea oil discovery. Ekofisk was the first development on the norwegian continental shelf ncs and is one of the largest discoveries ever made there. The practical geologist geology and earth science news. Monitoring, matching and predicting the reservoir performance will be performed with a complex reservoir model of 7700 cells. Since the beginning of production, in 1971, the field has experienced significant compaction, caused by pressure depletion. In order to construct a geologic fracture model for use in dual porosity simulation of the ekofisk field, all cored wells on the field were examined, and both lithological and fracture data were assembled. Field geology books waterproof pens field book covers. It has spaces to carry three pencils, an acid bottle and a short 6 rulerstyle map scale items not included.
Since that time, the north sea has proven to be one of the best areas for exploration anywhere in the world. The ekofisk field ekofisk is a giant chalk field containing approximately 6. Maley lists standard field geology books in the reference section compton, etc, but field geology for the beginnerstudent involves understanding field maps, not just photos, as good as these pics are. This is an essential field guide for geology lovers. The development of licence pl018 incorporated the ekofisk field itself, as well as the cod, vest ekofisk, edda, eldfisk, embla, tor unitised with pl006 and albuskjell unitised with pl011 fields.
In the mid1980s the ekofisk field as a whole and the platforms in particular were found to be suffering from an unexpected degree of subsidence. The ekofisk field is a naturally fractured chalk reservoir located in the norwegian sector of the north sea. Introduction 2 on 7 may 2001 at 0943 ut, a seismic event of moderate size m w 4. The last full book comptons geology in the field and maleys book on field geology. The first discovery was made in the cod field 3 years after licensing began it was in a pleistocene age sandstone the second discovery was 80 km south of the cod field on the uk side.
In 1962 he published manual of field geology, which soon became a classic. The field is located in block 27, about 16 kilometers south of ekofisk, not far from the uk and danish shelves. Box 220, n4056 tananger, norway and helen farrell phillips petroleum co. Structure map at top ekofisk formation as outlined in 1991. The giant ekofisk field was discovered in the fall of 1969. Aug 09, 2019 this website is one result of the ekofisk industrial heritage project, pursued in two periods fra 2002 ti 2005 and from october 2018 to october 2019 to document the ekofisk area on the norwegian continental shelf ncs.
Login as a different user aapg members user log in. The ekofisk source rock dates from the jurassic period, 161145 million years ago, and comprises organically rich black shales known as the draupne f ormation. In 1985 he published a revised manual geology in the field that continued to. Detailed geological investigation showed that it was the result of delayed compactional diagenesis of the chalk formation reservoir rocks. Check out the new look and enjoy easier access to your favorite features. This, combined with the severe shaking on the platforms, caused the operator of the ekofisk field, conocophillips norway, to ask the university of. Test production was initiated in 1971 and ordinary production started in 1972. Ekofisk is an oil field in block 24 of the norwegian sector of the north sea about 320 km 200. Australasian institute of mining and metallurgy, 1982. For a period of 27 years, frigg field in the north sea has offered oil and gas exploration from the reservoir. Eldfisk is the second largest of three producing fields in the greater ekofisk area and one of the largest on the norwegian continental shelf.
The 7 may 2001 induced seismic event in the ekofisk oil field, north. Ekofisk field norway central graben, north sea subject group. The ekofisk oil field is in the north sea, south of norway, with an estimated 6. It is a large, carbonate reservoir that has two zones, ekofisk and tor, that are highporosity, fractured chalks with matrix permeabilities of approximately 1 md and effective permeabilities that range from 1 to 50 md. Geology field book cover this cover is made to fit all of the bound field books sold above. Ekofisk, group of norwegian offshore naturalgas and oil fields located in the north sea about 180 miles 290 km southwest of norway, halfway between norway and the united kingdom. Examples of the geology to simulation workflow are given in technical papers on the ekofisk field, offshore norway toublanc et al. Seismic data placed the epicenter inside the ekofisk field and suggested a shallow. Pdf characterization of dense zones within the danian. Since the beginning in 1971, values of more than 2,100 billion norwegian kroner have been created in the greater ekofisk area. In norse mythology, draupne was the gold ring worn by the god odin which formed another seven rings every ninth day in other words, an endless source of prosperity. Having been a field geologist in the past, i have a number of field geology books on my shelf.
Written by a team of eminent geologists and educators, the field guide to geology, new edition features clear graphics and simple fieldguide procedures to guide hikers through the great outdoors. In 1985 he published a revised manual geology in the field that continued to serve as the definitive guide to geological mapping. Large volumes of petroleum are entrapped in upper cretaceous and lower tertiary strata in the central graben, norwegian sector, north sea fig. Mineral 1 is harder or softer than your fingernail. Dheur 1980 chalk reservoir of the west ekofisk field the sedimentation of the north sea reservoir rocks geilo norwegian petroleum society n. The ekofisk district includes the ekofisk field itself 1969. Pdf rock mechanics modelling of the ekofisk reservoir. Rock mechanics modelling of the ekofisk reservoir subsidence. Discovery of the giant ekofisk field in block 24 in the norwegian part of. The largest natural gas field in the north sea, troll gas field, lies in the norwegian trench, dropping over 300 metres 980 ft, requiring the construction of the enormous troll a platform to access it. The lowermost part is generally formed by argillaceous, pelagic chalk belonging to nannofossil biozone nntp1 and the lower part of nntp2, up to nntp2de 24a8. Facies, sediments and depositional environments cretaceoustertiary boundary events symposium 1 16 32 university of copenhagen m. Ekofisk is a field in the southern part of the norwegian sector in the north sea. Brewster elf petroland, the netherlands elf, france elf, norway 665 668 introduction ekofisk field recent data regional tectonics conclusions acknowledgements synopsis the main fault system in ekofisk field trends nnessw and affects the reservoir chalk sequence and.
Ekofisk was discovered in 1969, and the initial plan for development and operation pdo was approved in 1972. Oil and gas exploration from the reservoir 2618 words. Most of the gas produced at the field is sent to the eldfisk 27 e platform for drying and compression before being used as lift gas for wells. The water depth in the area is just under 70 meters. Network of offshore records of geology and stratigraphy. Phillips petroleum structure map at top ekofisk formation as outlined. The intent of this presentation is to discuss the current understanding of fluid flow control in this complex naturally fractured chalk reservoir, and how this understanding evolved over the past 40 years. Characterization of dense zones within the danian chalks of the ekofisk field, norwegian north sea article pdf available in petroleum geoscience 191. Successful waterflooding of ekofisk field will enhance recovery of the total oilin place, producing an extra 170 mm barrels of oil. The reservoir consists of twofinegrained limestone producing formations, the ekofisk formation danian ageand the tor formation maastrichtian age, separated by a thin, impermeabletight zone. The eldfisk field, located at a water depth of 70m around 320km offshore stavanger in block 27 in the greater ekofisk area of the norwegian north sea, is the fifth biggest oil field by reserve on the norwegian continental shelf the offshore oil field, which has been in production since 1979, is currently undergoing a major expansion project named the eldfisk ii project to increase output. The major northsouth axis of the field is approximately 10 km and covers an area of 50 sq km 12,000 acres.
West ekofisk field norway by daniel landreville on prezi. Subsidence due to fluid withdrawal, volume 41 1st edition elsevier. Box 1 68, n4001 stavanger, norway and john dangerfield phillips petroleum co. Pdf the large jointed chalk reservoir situated at 3 km depth in the north seas ekofisk field is undergoing major compaction after nearly 15 years of. The 7 may 2001 induced seismic event in the ekofisk oil field. Subsidence of geologic surface structures due to withdrawal of fluids from aquifers and. The geology and geophysics of the ekofisk field waterflood.
The oil and gas in ekofisk lies in a chalk reservoir composed of countless tiny shelly fragments derived from coccolithophores microscopic. The development of licence pl018 incorporated the ekofisk field itself, as well as the cod, vest ekofisk, edda, eldfisk, embla, tor. The ekofisk field is a northsouth trending anticline, with a central graben, forming a structure that is 49 km 2 19 sq mi in area, with 244 m 801 ft of vertical closure and a hydrocarbon column 305 m 1,001 ft long, formed by permian zechstein salt movement in the form of salt pillows. Successful waterflooding of ekofisk field will enhance recovery of the total oilinplace, producing an extra 170 mm barrels of oil.
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