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<jats:title>Abstract</jats:title> <jats:p>The Canadian Arctic Prograded Margin Tectono-Stratigraphic Element (CAPM TSE) is located on the continental shelf and slope which lie to the northwest of the Canadian Arctic Archipelago. The TSE comprises the post-rift succession deposited on the eastern margin of the Amerasia Basin and the strata range in age from Late Cretaceous to Pleistocene. Over much of the TSE, a major unconformity marks the base of the succession and underlying strata vary from Jurassic-Early Cretaceous strata of the Canadian Arctic Rift Margin TSE to older Late Paleozoic-Triassic strata of the Sverdrup Basin CTSE. Sparse reflection and refraction seismic data indicate that the succession can be greater than 10 km thick. The TSE is divided into 3 structural domains with deformation increasing to the northeast. The Southern Domain is extensional and is characterized by listric growth faults with roll-over anticlines and tilted fault blocks. The pre-Oligocene portion of the Central Domain is deformed by broad folds with extensional faults in the younger strata. The pre-Oligocene succession in the Northern Domain is likely strongly folded and cut by thrust faults of the Eurekan Orogeny with extrusive and intrusive igneous rocks occurring in the Late Cretaceous strata. Petroleum source rocks, as well as abundant reservoir and seal strata, occur throughout the TSE indicating good potential for the presence of petroleum resources. The remote and environmentally sensitive location of the TSE, however, makes it likely it will never be a target for petroleum exploration.</jats:p>

<jats:title>Abstract</jats:title> <jats:p> The Sverdrup Basin composite tectono-sedimentary element (SB CTSE) covers 210,000 km2 in the Canadian Arctic Archipelago. The CTSE was initiated in Early Carboniferous by rifting on highly deformed Early Paleozoic strata and contains a maximum of 15 km of Carboniferous to Eocene strata. Eight phases of basin development have been recognized with each being characterized by a specific combination of tectonic and depositional regimes. The phases are separated by intervals of uplift and tectonic reorganization, and each resultant 1 <jats:sup>st</jats:sup> order sequence is regarded as a separate TSE. Carbonate sedimentation was dominant in Late Carboniferous and Early Permian with clastic sedimentation becoming more common in Middle Permian. Source areas lay to the east, south and north. In the Triassic, clastic sedimentation rates increased, and by the end of the Triassic, the central basin was filled. A shallow seaway was present throughout the Jurassic. In Early Cretaceous subsidence rates and clastic supply significantly increased and basic volcanism occurred over most of the CTSE. Subsidence rate, sediment supply and volcanism decreased in Late Cretaceous. The basin was progressively deformed in Paleogene (Eurekan Orogeny) with local foreland deposits reaching 3 km. Seventeen oil and gas fields have been discovered on salt-cored, Eurekan anticlines. Combination stratigraphic-structural traps, involving Triassic-Jurassic strata, have the greatest potential for future hydrocarbon discoveries. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The Loppa High Composite Tectono-Sedimentary Element is a mature exploration area in the south-western Norwegian Barents Sea hosting Skrugard (2012) and the Late Paleozoic Gohta (2013) discoveries. The exploration of the Loppa High started in 1985, and today this is the most studied area of the Barents Shelf which subsurface mapping is based on dense coverage of modern 3D and 2D seismic data and drilling results of over 40 exploration wells. This chapter summarizes the tectono-sedimentary and sub regional development and the petroleum geology of the Loppa High.</jats:p>

<jats:p>This volume provides a landmark documentation of Jurassic sequence stratigraphy in the North Sea Basin, onshore UK and adjacent regions of the British Isles. It includes detailed sequence descriptions, historical syntheses and updated lithostratigraphy and biozonation schemes, all illustrated by numerous case studies, maps, well displays, seismic lines and biozonation charts.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The application of sequence stratigraphic concepts and methods augments the efficient development of North Sea hydrocarbon fields with Jurassic reservoirs. In particular, the approach provides enhancements to the development of robust reservoir zonations, more accurate assessments of the extent and continuity of reservoir zones and flow units, clearer identification and prediction of the most productive reservoir intervals, improved understanding of field-wide pressure barriers or baffles to fluid flow, and enhanced reservoir models. In addition, carbon capture and storage (CCS) projects in Jurassic rocks will benefit from the adoption of a sequence stratigraphic approach by enhancing the understanding of storage unit architecture, connectivity and top seals. In this chapter, these applications are discussed with reference to around 20 case studies from the North Sea Basin.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>An updated, integrated biozonation scheme for the Jurassic (Hettangian)–lowermost Cretaceous (Upper Berriasian) of the North Sea Basin incorporates 49 palynology biozones plus subzones (based on dinocysts, spores and pollen) and 27 microfaunal zones plus subzones (based on foraminifera, radiolaria and ostracods) to provide the essential chronostratigraphic calibration of the defined sequences. The biozonation scheme is tied to standard ammonite zonal chronostratigraphy wherever possible. Parts of the biozonation scheme are also applicable to onshore UK (boreholes and outcrops), onshore Denmark (boreholes) and offshore Netherlands.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>This chapter describes uppermost Middle Jurassic–lowermost Cretaceous second-order stratigraphic sequences J40, J50, J60 and J70, and their component third-order sequences J42–J46, J52–J56, J62–J66 and J71–J76. The latest Callovian–Berriasian was an interval of significant tectonism that led to the development of complex stratigraphy and highly variable successions, the elucidation of which is aided by the recognition of the correlation of the J sequences. Marine sedimentation dominated the Callovian–Berriasian interval, with the development of multiple sandstone members comprising reservoir units in many hydrocarbon fields, charged by marine source rocks (e.g. the Kimmeridge Clay Formation). Each of these units is subdivided and correlated by a succession of J sequences. Several sequences are renumbered (e.g. J54, J55, J65 and J66), some sequence definitions are amended or their basal boundaries recalibrated chronostratigraphically (J52, J54, J72, J73, J74 and J76) and new sequence subdivisions are recognized (J64a, J64b, J72a–J72c, J73a and J73b). Significant unconformities are recognized at the bases of the J54, J55, J62, J63, J64, J71 and J73 sequences. The top of J70 (J76) equates to the major ‘Base Cretaceous Unconformity’ seismic sequence boundary.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>Sequence stratigraphy has become a powerful tool in the basin analysis of the North Sea Basin, and will continue to be important in the maximization of the remaining hydrocarbon resources of Jurassic reservoirs in the region, whilst also moving through the energy transition.</jats:p> <jats:p>This chapter provides background to the main theme of this memoir, which is the description of a revised sequence stratigraphy scheme for the Jurassic–lowermost Cretaceous of the region, recognizing 39 stratigraphic sequences (‘J sequences’).</jats:p> <jats:p>The sequences are illustrated by 85 reference wells (56 UK wells, 22 Norway wells and seven Denmark wells), showing chronostratigraphy, lithostratigraphy, wireline logs and key biostratigraphic markers. The reference wells illustrate sequence development, together with their lower and upper boundaries. Comparisons of the North Sea Jurassic sequences with onshore outcrop sections, from the UK, demonstrate that many of the sequences can be recognized onshore. A comparison of the well sequences with seismic sequences is made in 17 illustrated seismic lines, demonstrating the seismic expression of many of the defined sequences.</jats:p> <jats:p>The recognition of a consistent set of stratigraphic sequences across the region allows a much better understanding of the development of the whole area during the Jurassic, which is currently hindered by the existence of multiple local and semi-regional lithostratigraphic schemes, in particular the differing notations that are utilized in the various international offshore jurisdictions that exist across the area.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>This chapter reviews sequence stratigraphic concepts and methodologies and presents an approach that is most applicable to the North Sea Jurassic, based on the concept of genetic sequence stratigraphy. The concept of depositional sequences, comprising rock units bounded by unconformities, has been developed from the late nineteenth century up to the present day. Many different studies have been carried out on North Sea Jurassic sequence stratigraphy, from the early 1980s to the present day and involving a range of different approaches. Many authors have adopted the J sequence approach that was first published in the early 1990s; however, a number of alternative North Sea Jurassic sequence schemes have also been described. A close relationship existed between tectonics and sequence boundary development, particularly during the Middle–Late Jurassic in the North Sea region. Several of the major unconformities that are known to be of regional extent can be directly related to significant tectonic phases. Other sequence boundaries, for which a tectonic control is not evident, for example, particularly in the Early Jurassic, were potentially driven by glacio-eustatic cycles, which may have been controlled by orbital forcing cycles.</jats:p>