Our sequences are interpreted from a combination of lithostratigraphic, biostratigraphic and seismic stratigraphic correlation. Review and computer modelling of the brent group stratigraphy. Bibtex entry for this abstract preferred format for this abstract see preferences find similar. The study area is in a low accommodation setting on the cratonic margin of the western canada sedimentary basin. 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. This paper was part of the sequence stratigraphy research project at the university of bergen, norway, and is a product of studies on the architecture. The geometries and so stacking patterns of uncemented carbonates and clastics.
Ironstones, condensed beds, and sequence stratigraphy of the. 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. 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. In the late 1970s, seismic data was interpreted stratigraphically to define packages of strata hundreds of meters thick that were deposited between sea level cycles that lasted 0.
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. A sequence stratigraphic framework was erected for the clinton group by brett and others. The ones marked may be different from the article in the profile. Sequence stratigraphy is a working methodology that. The north of the brent province differs from classically studied southern areas in being dominated by marginalmarine deltafront. Vail riceuniversity, houston, texas it is important to establish the fundamental concepts of sequence stratigraphy and to define terminology critical for the communication of these concepts. Sequence stratigraphy deals with genetically related sedimentary strata bounded by unconformities.
Sequence stratigraphy is concerned with the largescale, threedimensional arrangement of sedimentary strata, and the major factors that influence their geometries such as sealevel change, contemporaneous fault movements, basin subsidence and sediment supply cf. In western newfoundland, a cambrian to ordovician sequence of shale and carbonates cow head group is preserved in several allochthonous thrust sheets humber arm allochthon that represent a transect across the continental slope james and stevens, 1986. North sea, but also the brent group broom, rannoch, etive and tarbert formations of the northern north sea. The tectono stratigraphic evolution of the northern north sea is class into three main stages. The north of the brent province differs from classically studied southern areas in being dominated by marginalmarine deltafront facies. These facies are grouped into six spatially recurring facies associations. The brent group reservoir in the strathspey field, uk north sea comprises shallow marine, marginal marine and nonmarine strata of variable reservoir character. 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 sea. Advances in sequence stratigraphy and the development of depositional models have helped explain the.
Detailed stratigraphy and facies analysis of the paleoproterozoic athabasca group along the shea creek. The problem can be as simple as a recorrelation to explain pressure miscommunication between wells, or as complex as predicting the distribution of sweet spots within an unconventional mixed carbonatesiliciclastic succession. Accounts of the geology of individual brent group fields are not included, as these are. A magnetopolarity stratigraphy has been constructed by detailed palaeomagnetic investigations of a wellcore covering the middle jurassic brent group, north sea. Sequence stratigraphy american association of petroleum. Petrographic evaluation of the middle jurassic sandstones. Dunlin group and represents a separate depositional phase to the main brent progradational shorefacedeltaic sequence. Combined low and high resolution sequence stratigraphy can be used in largescale lithological prediction and comparison between systems situated far apart, and in detailed withinsystem predictions on a reservoir scale.
Middle jurassic magnetopolarity stratigraphy of a wellcore from the brent group, north sea. Walton 1996 was the first to apply sequence stratigraphic concepts to cherokee group strata, concluding that numerous sequences exist. Exploration play analysis from a sequence stratigraphic. This online guide is primarily aimed at the application of sequence stratigraphy to outcrops.
The lowest sequence in the athabasca group, the shea creek sequence. Pdf the regional development of the middle jurassic brent group northern north sea has been studied within a sequence stratigraphic framework, and. The sequence part of the name refers to cyclic sedimentary deposits. Through examination of the scaling relations of faults and the use of seismic stratigraphic techniques, we demonstrate how the temporal and spatial evolution of the fault population in a halfgraben basin can be accurately reconstructed. A basinwide sequence stratigraphy for the middle jurassic has been developed, comprising two tectonostratigraphic units j20, aalenianlate bajocian and j30. Xujiaweizi rift lower cretaceous yingcheng group volcanic. We specialize in solving geologic problems encountered in the oil and gas and mining sector. Sequence stratigraphy and coal cycles based on accommodation trends were investigated in the coalbearing lower cretaceous mannville group in the lloydminster heavy oil field, eastern alberta. We suspect the apparent coherence of the brent delta facies masks a discontinuous offset patchwork of sediment layers and bodies that together comprise the rannoch, etive and ness formations. In this context, we present a regional, highresolution sequence stratigraphic framework for the brent group, uk north sea based on extensive sedimentological reinterpretation of core and wirelinelog data, combined with palynostratigraphy and published literature. The subzone comprises relatively coarsegrained and pebbly sandstones deposited as a series of subtidal channels and associated sublittoral sheet and shoalmargin sequences. Trajectory analysis of the brent group jurassic, northern north sea. Sedimentology and sequence stratigraphy of the thistle field. The ness formation bajocian consists of the alluvial distributary plain deposits of the middle jurassic brent delta.
Accordingly, such studies 43 sequence stratigraphy of source and reservoir rocks in the upper permian and jurassic of. Sedimentology and sequence stratigraphy of the middle. Role of forced regression in controlling brent group reservoir. Posamentier exxon production research company houston, texas and p. Sequence stratigraphy and palaeogeography of the middle jurassic. Sequence stratigraphy is a methodology that employs stratal stacking patterns and key bounding surfaces to erect a framework allowing depositional facies to mapped and interpreted paleogeographically. The stratigraphy and main facies of the brent group in the oseberg. Differential subsidence in the ness formation foreninger ved uio. Regional to global correlations by amina mabrouk1, ian jarvis2, habib belayouni1, amanda murphy2, and richard t.
Sequence stratigraphy material for this chapter are mainly from the following articles. 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. High and low resolution sequence stratigraphy in lithological. Nov 12, 20 despite a number of publications dealing with the sequence stratigraphy of the brent group, regional interpretation remains less than straightforward. Sequence boundary fill pup22s1 mid ness shale bay mudstone 200 ft. Abstract not available bibtex entry for this abstract preferred format for this abstract see preferences. Geology, sequence stratigraphy, and oil and gas assessment of. With this paper we summarize in part, and build upon, the work published by catuneanu et al. Application of highresolution sequence stratigraphy to northwest hutton field, northern north sea. Ashton embry for his work in making this series possible. Alongside 3d seismic, longreach horizontal drilling and the application of plate tectonics to exploration, sequence stratigraphy has been one of the greatest scientific advances within the petroleum geology industry of the last 50 years. This has allowed a chronostratigraphical subdivision of the ravenscar group and enabled regional correlation of the constituent formations with coeval sediments of similar facies of the north viking graben brent group and offshore midnorway fangst group. A biostratigraphic, strontium isotopic and lithostratigraphic study of the upper part of hordaland group and lower part of nordland group in well 3472, 34712 and 347r1 h from the tordis field in the tampen area northern north sea. We have focused on the upper permian and uppermost triassic jurassic successions where the presence of source and reservoir rocks are well documented from previous studies.
To establish the depositional setting of the sedimentary section, sequence stratigraphy uses the geometric arrangement of sedimentary fill, particularly the vertical succession of sedimentary facies geometries and their enveloping surfaces known as stacking satterns. The bottom three represent facies contacts developed within systems tracts. Sedimentology and sequence stratigraphy of the middleupper jurassic krossfjord and fensfjord formations, troll field, northern. Petrographic evaluation of the middle jurassic sandstones of the brent group, north sea a petrographic study of the ness, etive and rannoch formations. Figure 2 therefore provides a tabulated and graphical summary of the principal facies relevant to the study area. The connectivity and production characteristics of these sandstones can be predicted through the application of highresolution sequence stratigraphic correlation techniques. The stratigraphy of the great valley sequence has been the subject of much work, but problems, particularly nomenclatural, remain. Establishment of a magnetostratigraphic framework for sequence stratigraphic modelling of the fluvial reservoirs in the lunde formation 251 c.
Field work during the summer of 1993 included biostratigraphic, sedimentological and sequence strati. Differential subsidence in the ness formation bajocian. Facies variability within a mixed carbonatesiliciclastic. Trajectory analysis of the lower brent group jurassic.
Bullimore department of earth science, university of bergen, norway. Sequence stratigraphy and palaeogeography of the middle. Idealized succession of lowstand, transgressive, and highstand sequence. 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. Pdf sequence stratigraphy and palaeogeography of the. 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.
Even though the physical dimensions of the outcrop might be fairly. The implication is that in several regional stratigraphic frameworks. Controls on facies architecture in the brent group. Sequence stratigraphy, sea level change and palaeoenvironments via chemostratigraphy. In particular, when the volcanic eruption is strong and multistage, the phase sequence changes further complicated in the horizontal and vertical.
It usually involves subdividing a sedimentary basin fill into individual sequence s of deposition hence the name, which can then be linked to changes in the two fundamental parameters of sediment supply and accommodation the amount of space available for deposition. Tectonostratigraphic evolution of the brage fault zone. The structural and stratigraphic evolution of the north sea rift system is described, from the onset of prerift thermal uplift in the aalenian to the failure of the rift system caused by the transfer of extension out onto the atlantic margin during the neocomian. Waage a shorter contribution to general geology geological survey professional paper 274b a revised subdivision and terminology for the dakota group and local details of its stratigraphy united states government printing office, washington. Trajectory analysis of the lower brent group jurassic, northern north sea. 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 recognized. Idealized creaming curve from a sequence stratigraphic perspective. L sequence stratigraphy and palaeogeography of the middle jurassic brent and vestland deltaic systems, northern north sea. Building blocks of the sequence stratigraphic framework fundamental principles a sequence stratigraphic framework may consist of three dif. Sequence stratigraphy as a sequence stratigraphy as a. Formation and overlying brent group are marked by sharp breaks in the welllog curves, as are the.
He has held positions in both academia and industry, and is a current academician in the russian academy of science. The scale of the outcrops offer a regional scale of investigation that will be useful for. Paleogeographic reconstruction of facies belts at precise moments in time is the goal of the sequence stratigrapher. As a result, none of the examples deal with topics related specifically to cores, well logs, or most significantly, seismic. Classic brent stratigraphy tarbert ness etive rannoch broom mid ness shale upper brent lower brent. Dunlin group sequence stratigraphy in the northern north. Sequence stratigraphy of the lower jurassic dunlin group.
Middle jurassic magnetopolarity stratigraphy of a wellcore. Sequence stratigraphy of source and reservoir rocks in the. 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. Such withintrend facies contacts may be marked on a sequence stratigraphic crosssection only after the sequence stratigraphic framework has been constructed. This cited by count includes citations to the following articles in scholar. The regional development of the middle jurassic brent group northern north sea has been studied within a sequence stratigraphic framework, and four. The mesaverde group in the san juan basin was deposited on the western shelf of the epicontinental cretaceous. Pdf the depositional history of the brent delta system can be analysed.
Pdf sequence stratigraphy and palaeogeography of the middle. Viking group, which is situated above the prolific brent group. Stratigraphy is the geologic knowledge about the processes by which sedimentary deposits form and how those deposits change through time and space on the earths surface. The broom formation overlies a basal brent sequence boundary and is a lowstand to transgressive systems tract tidalestuarine complex. Synsedimentary tectonics of the jurassic sedimentary. The prograding rannoch and etive formations of the brent group show a uniform. The components of the creaming curve refer to systems tract or sequence set, depending upon the size and scale of the play being considered. This surface marks the most landward position of the shoreline within a sequence, and typically, the deepest water facies within a sequence. Sequence stratigraphy and palaeogeography of the middle jurassic brent and vestland deltaic systems, n orthern north sea erik fjellanger, tina r. Northern front range foothills, colorado by karl m. Lundschien the distal sandstone pinchout of the mesa verda group, san juan basin and its relevance for sandstone prediction of the brent. Role of forced regression in controlling brent group.
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. Dakota group in northern front range foothills, colorado. Marine flooding surface separating the underlying transgressive systems tract from the overlying highstand systems tract. 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. The basin bounded by the 62 km long strathspey brent statfjord fault array is located on the western. Implications for management of a mature brent group field 1. This note summarizes the results of further studies that support this lower position for the boundary. Sedimentary tectonics of the jurassic sedimentary sequence in the northern viking rift graben. Xujiaweizi rift lower cretaceous yingcheng group volcanic sequence stratigraphic features 437 traditional sequence stratigraphy is difficult to find and compare. The brent group is the top of the prerift sequence of the. Appraising a late middle aged brent group field reservoir learnings after nearly 20 years of pelican field production. Published online by the canadian society of petroleum. Idealized succession of lowstand, transgressive, and highstand sequence sets.
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