As domal uplift related to incipient rifting is commonly associated with subsidence in its vicinity, erosional products tend to accumulate in associated. Establishment of a magnetostratigraphic framework for sequence stratigraphic modelling of the fluvial reservoirs in the lunde formation 251 c. Sequence stratigraphy and palaeogeography of the middle. Sequence stratigraphy also allows a stratigraphic succession to be put into a time framework which in turn allows the depositional history and paleogeographic evolution to be interpreted against a background of baselevel changes. Pdf sequence stratigraphy and palaeogeography of the middle. Building blocks of the sequence stratigraphic framework fundamental principles a sequence stratigraphic framework may consist of three dif. Advances and applica tions for exploration and production in north west europe, february, stavanger, p. Group, sequence stratigraphy and tectonic influence on the brent group. Sedimentology and sequence stratigraphy of the middle. Application of highresolution sequence stratigraphy to northwest hutton field, northern north sea.
Stratigraphy the middle jurassic brent group stratigraphy is subdivided into. Regarding tectonic influence on sedimentation within particular formations of the brent group yielding proposes deposition of the. The stratigraphy of the coastal plain of delaware is discussed with emphasis placed upon an appraisal of the stratigraphic nomenclature. The brent group is the top of the prerift sequence of the.
Jan 01, 2001 145 sequence stratigraphy of the lower jurassic dunlin group, northern north sea m. Brent group stratigraphy, structure, sedimentology and oil field geology richards 1992. Regarding tectonic influence on sedimentation within particular formations of the brent group. The middle jurassic brent group sediments and their correlatives on the norwegian shelf are, in economic terms, the most important hydrocarbon reservoir in nw europe. The lower rannoch formation middle jurassic brent group forms an interval of such heterolithic sandstones in many north sea reservoirs, and is used to illustrate a workflow for rapid. Pdf sedimentology and sequence stratigraphy of the middle. The brent group reservoir shows a complex diagenetic sequence.
Sedimentology and sequence stratigraphy of the middleupper jurassic krossfjord and fensfjord formations, troll field, northern north sea. A core and logbased study of 37 wells around the don fields was performed to establish a sequence stratigraphic framework, map facies and. The prograding rannoch and etive formations of the brent group show a uniform. The stratigraphic framework combines data from over 500 exploration wells with seismic and field data magnus, brae, miller, ula, gyda and clyde. In order to assess the future exploration potential of this play fairway, a high resolution, predictive, sequence stratigraphy was erected for the north sea late jurassic. The north sea is part of the atlantic ocean in northern europe. Petrographic evaluation of the middle jurassic sandstones of. In particular, when the volcanic eruption is strong and multistage, the phase sequence changes further complicated in the horizontal and vertical. Synsedimentary tectonics of the jurassic sedimentary. The fate offeldspars in brent group reservoirs, north sea.
Both groups indicate the occurrence of the aptianalbian boundary in the same. Pdf the regional development of the middle jurassic brent group northern north sea has been studied within a sequence stratigraphic framework, and. Sediments of kimmeridgian to late ryazanian age form a group of key hydrocarbon play fairways in the synrift jurassic of the north sea. Genetic sequence stratigraphy for the north sea late. Controls on facies architecture in the brent group. A variety of processes give rise to stratigraphic changes in sediment composition, including. Application of highresolution sequence stratigraphy to. Lundschien the distal sandstone pinchout of the mesa verde group, san juan basin and its relevance for sandstone prediction of the brent group, northern north sea 263. The stratigraphy and main facies of the brent group in the oseberg field. Detailed stratigraphy and facies analysis of the paleoproterozoic athabasca group along the shea creek douglas river transect, northern saskatchewan. Jul 01, 2003 the brent group reservoir in the strathspey field, uk north sea comprises shallow marine, marginal marine and nonmarine strata of variable reservoir character. Dunlin group sequence stratigraphy in the northern north. Applied biostratigraphy and sequence stratigraphy in oil.
Figure 2 therefore provides a tabulated and graphical summary of the principal facies relevant to the study area. Architecture and sequence stratigraphic perspectives of the dunlin group. Practical sequence stratigraphy was originally published as a fifteenpart series in the canadian society of petroleum geologists monthly magazine, the reservoir, between may 2008 and september 2009. With this paper we summarize in part, and build upon, the work published by catuneanu et al. While this published database did not use precise sequence stratigraphic. Sequence stratigraphy and palaeogeography of the middle jurassic.
Xujiaweizi rift lower cretaceous yingcheng group volcanic sequence stratigraphic features 437 traditional sequence stratigraphy is difficult to find and compare. Synsedimentary tectonics of the jurassic sedimentary sequence in the northern viking graben, producing asymmetrical stratal packages. Sequence stratigraphy on the northwest european margin, volume. Middle jurassic, upper jurassic and lower cretaceous of the. However, the synsedimentary boundary fault has had some influence on the shallow. Role of forced regression in controlling brent group. Sequence stratigraphy is a major research subject in the geosciences academia and the oil industry. The stratigraphy of the surat basin, queensland, has historically been subdivided by formation and unit nomenclature with a few attempts by other authors to apply sequence stratigraphy to existing formation boundaries. Sedimentary tectonics of the jurassic sedimentary sequence in the northern viking rift graben north sea, producing asymmetrical stratal packages. Sequence stratigraphy lamontdoherty earth observatory. In the over 200 published papers on brent group there is described the advance of the brent group, sequence stratigraphy and tectonic influence on the brent group. The tectono stratigraphic evolution of the northern north sea is class into three main stages. Banerjee3, and vibhuti rai4 1 department of earth and environmental sciences and lamontdoherty earth observatory of columbia university, palisades, new york 109648000.
The heather a unit and the krossfjord formation are latest bajocian in age 165 ma and lie above a regionally extensive transgressive surface that caps the brent group mfs j32. Tectonic influence on the jurassic sedimentary architecture in the. Secondary porosity is made due to the dissolving feldspar, but lost again due to the precipitation of kaolinite. The development of the brent deltaic system has been interpreted in these papers ilsing palynological, sedimentological and sequence stratigraphic approaches graue et al. Petrographic evaluation of the middle jurassic sandstones. The ness formation is an alluvial succession of mudrocks, coal beds and fluvial sandstones, sandwiched between laterally persistent shallow marine sand stones oseberg fm, rannochetive fms. Xii contents high resolution sequence stratigraphy as a basis for 3d reservoir modelling a case study from the southern oseberg area 315. However, the geoscience education literature addressing students understanding of the basic concepts of sequence stratigraphy is relatively thin, and the topic has not been well explored. Pdf sedimentology and sequence stratigraphy of the. Part of this workshop manual contains preliminary results of research. Sequence stratigraphy of the lower jurassic dunlin group. Rock strati graphic units, based mainly on data from certain key wells, are described.
Characterization of effective permeability in heterolithic. It is located between norway and denmark in the east, scotland and england in the west, germany, the netherlands, belgium and france in the south the geology of the north sea describes the geological features such as channels, trenches, and ridges today and the geological history, plate tectonics, geological events that created them. Implications for management of a mature brent group field 1. Sequence stratigraphy of the middle to upper jurassic, viking. Previous published models for the stratigraphic evolution of the middle jurassic aalenianbathonian brent group and its equivalents rely largely upon. Genetic sequence stratigraphy for the north sea late jurassic. Jan 01, 1995 applications of high resolution sequence stratigraphy and facies architecture in mapping potential ad ditional hydrocarbon reserves in the brent group, statfjord field. The brent group in block iv fits into the classical overall regressivetransgressive, wavedominated delta model widely accepted for these sediments. Sequence stratigraphy as a concrete stratigraphic discipline abstract sequence stratigraphy is a stratigraphic discipline in which stratigraphic surfaces that represent changes in depositional trend are used for correlation and for defining specific types of sequence stratigraphic units.
Correlation of transgressiveregressive depositional. The regional development of the middle jurassic brent group northern north sea has been studied within a sequence stratigraphic framework, and four depositional sequences exxonian have been. Walton 1996 was the first to apply sequence stratigraphic concepts to cherokee group strata, concluding that numerous sequences exist. Dunlin group sequence stratigraphy in the northern north sea. Such interpretations provide the predictive aspect of sequence stratigraphy. Sequence stratigraphy, sedimentology and stratigraphy, mesa verde geology, brent group, and sedimentary forward modelling download. Sedimentology and sequence stratigraphy of the thistle field. A revised stratigraphic column for delaware is proposed. Differential subsidence in the ness formation bajocian.
Controls on the distribution, geometry, connectivity and orientation of sandbodies within the reservoir have been assessed via the application of highresolution sequence stratigraphic methods to an integrated dataset comprising core. Stratigraphic subdivisions of highstand, transgressive, and lowstand systems tracts or sequence sets are easily delineated from available published statistics and classifications. Also worthy perhaps of mention is the separate large reservoir underneath the brent group where oil and gas are present in the statfjord group sandstones of latest triassic age. Nevertheless, the sequence stratigraphic significance of certain facies is sometimes overlooked, and an overview of facies interpretations is a helpful foundation for describing brent architecture and sequence stratigraphy. Johannessen 2d computer simulation of the brent delta development 299 j.
The reservoir properties of distal lowershoreface and distal wavedominated deltafront deposits, which consist of sandstone beds with locally scoured bases and mudstone interbeds, are poorly understood. Shows dissolving feldspar and precipitation of kaolinite during early diagenesis in the brent group ness fm. This model did not tak e into account the m ultiple occur rence of the cook formation, and some of these. Petroleum geology of the continental shelf of north west europe illing, l. The north of the brent province differs from classically studied southern areas in being dominated by marginalmarine deltafront facies. Oil is contained within middle jurassic sandstones that can be divided into the five lithostratigraphic divisions of the brent group. Deposition of the brent group has been coupled with the growth and erosion of a midnorth sea dome, as well as with nondome related tectonics along the northern north sea rift margins. Fenton sequence stratigraphic analyses of the lower jurassic dunlin group of the north viking graben provides a consistent basinwide framework for a better understanding of the sedimentary facies distributions. The brent group lithostratigraphy is essentially sim ple, consisting of five formations, which from the base upwards are broom, rannoch, etive, ness and tarbert. The middle jurassic brent group of the northern north sea presents a mature and highly productive reservoir play fairway where a combination of effective facies analysis and depositional sequence stratigraphy offers real potential to optimize exploitation. Ashton embry for his work in making this series possible. The middle jurassic brent group reservoirs in northwest hutton comprise shallowmarine, marginalmarine, and coastalplain reservoir sandstones of both channelized and sheet geometries. Use of genetic sequence stratigraphy in defining and determining. The perceived yettofind reserves of these often subtle plays, lying at or below seismic resolution, have attracted considerable industry attention over the past few years.
Atle folkestad, tore odinsen, edel areklett and haakon fossen. Regional sequence stratigraphy of the brent delta within norwegian sector of northern north sea is an issue of papers by stattegger et al and bjorlykke et al. Course participants are also encouraged to bring along biostratigraphic data, logs and seismic where appropriate from their own companies so that real working examples can be interpreted. Sequence stratigraphy as a sequence stratigraphy as a.
The connectivity and production characteristics of these sandstones can be predicted through the application of highresolution sequence stratigraphic. The following subsections describe the sequence stratigraphical features of each stratigraphical unit. Sedimentology and sequence stratigraphy of the middleupper. Tectonostratigraphic evolution of the brage fault zone.
Sequence, parasequence and intraparasequence architecture of the grassy member, blackhawk formation, book cliffs, utah, usa. The lower brent group stratigraphy, reservoir architecture and. Numerous papers graben area during late permianearly triassic times describing the stratigraphy of the brent group have been giltner, 1987. These formations are mainly a part of the brent group which consists of five. Steel 1993 recognized three regressivetransgressive megasequences def ined as largescale depositional units bounded b y maximum flooding levels within the dunlin gr oup. However, other workers have reported that an extension commenced in places during the bajocian and involved the upper parts of the brent group 19, 20. Sequence stratigraphy of the middle to upper jurassic. Sequence stratigraphy and genetic stratigraphy differ primarily in the way that fundamental depositional units are defined figure 1. Viking group, which is situated above the prolific brent group fig. Identifying students conceptions of basic principles in.
Published online by the canadian society of petroleum. Pdf sequence stratigraphy and palaeogeography of the. A basinwide sequence stratigraphy for the middle jurassic has been developed, comprising two tectonostratigraphic units j20, aalenianlate bajocian and j30. Concepts in stratigraphy stratigraphy basic concepts lithostratigraphy sequence stratigraphy sea level and sediment supply consequences of changes in sea level types of sequences biostratigraphy other types of stratigraphy basic principles steno 1669 principal of original horizontality sediments deposited as essentially horizontal beds. Brent group log suite and stratigraphic interpretation of 68,76 sequence boundaries in 78, 78 brown limestone formation egypt 2512, 2s7 buildup inrercarbonate. Graue and coworkers 1986 and hellandhansen with coworkers 1995 gives a detailed description of the advance and retreat of the brent delta.
Exploration play analysis from a sequence stratigraphic. Sedimentology and sequence stratigraphy of the middleupper jurassic krossfjord and fensfjord formations, troll field, northern north sea nicholas e. Even though the physical dimensions of the outcrop might be fairly. Reserves are currently estimated by bp exploration at 1 to 5 billion barrels of oil.
The sedimentological distribution of upper brent, oseberg. The tarbert and hugin formations mainly bajocianbathonian to callovian of the northern north sea were formed in the overall transgressive phase of the brent vestland group megasequence. Xujiaweizi rift lower cretaceous yingcheng group volcanic. Middle jurassic, upper jurassic and lower cretaceous of. Role of forced regression in controlling brent group reservoir.
In the case of sequence stratigraphy, the depositional sequence is defined as a relatively conformable succession of genetically related strata bounded by unconformities and their. Don 21118 fields, only a small stratigraphic break is developed with late aalenian sandy shales of the. At a local to fieldscale, lithostratigraphy may be able to represent stratigraphy well, but at regionalscale, lithostratigraphic units are likely to be diachronous. The most complete database is that of the bureau of economic geology seni et al. In 1971 the brent field was discovered by shellesso and tested in 1972 with 1. Formation and overlying brent group are marked by sharp breaks in the welllog curves, as are the. The brent group is the top of the prerift sequence of the jurassic rifting phase 18. Outcrop and subsurface examples from the cretaceous of north america. Increased rates of faultrelated subsidence occurred during the late aelenianearly. Sequence stratigraphy of the brent group is discussed by.
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