Showing papers in "Marine and Petroleum Geology in 1989"

TL;DR: In this article, a linear correlation between temperature and the log of the partial pressure of CO2 (i.e., PCO2) in the reservoir fluid was found in both the US Gulf Coast and the Norwegian continental shelf.

TL;DR: Fluid inclusions occur in authigenic quartz, baryte, ankerite and calcite cements that partially occlude inferred secondary porosity in Piper Formation sandstones of the Tartan field and adjacent Witch Ground Graben as discussed by the authors.

TL;DR: A total of 48 sediment samples, comprising both black shales and associated organic-poor interbeds, were examined from Toarcian organic-rich sections throughout Europe as mentioned in this paper.

TL;DR: In this paper, an assemblage of acoustic and topographical features recorded on high-resolution 3.5 kHz sub-bottom profiler records are discussed, and a close relationship between locally elevated sea bed (mounds or ridges) and the several acoustic features is found in the Adriatic sea off Ortona, Italy.

TL;DR: Theoretical calculations indicate that the cooling of pore waters initially in equilibrium with a carbonate mineral can result in the water becoming undersaturated with respect to that mineral as mentioned in this paper.

TL;DR: In this paper, the pore pressure is mainly controlled by rapid loading, aquathermal pressuring, oil generation and possibly by shale dewatering above the depth for the onset of gas generation (formation overpressure typically in the range 1500-2500 psi).

TL;DR: In this paper, the authors analysed the late Cenozoic sedimentation from four varied sites on the continental slopes off southeastern Canada using high-resolution airgun multichannel seismic profiles, supplemented with some single channel data.

TL;DR: In this article, a late Permian, Triassic and early Lias rift succession up to 1 km thick is revealed from offshore NW Ireland, with a series of newly defined basins collectively forming the North Porcupine Basin.

TL;DR: In this paper, the maturity and source rock potential of organic rich beds in the Triassic Schei Point Group in the Sverdrup Basin, Arctic Canada have been investigated using reflected light microscopy and the results are compared with other maturity parameters determined geochemically.

TL;DR: In this paper, the major sequence boundaries are defined at abrupt facies changes which usually represent deepening events, often associated with a hiatus, and they are dated as (1) Late Triassic; (2) Mid Sinemurian (Birchi subzone, Turneri zone diachronous to Oxynotum zone); (3) Early Toarcian (Exaratum subzone and Falciferum zone), (4) Latest Toarcians (Aalensis subzone), Levesquei zone);(5) Late Bajocian (

TL;DR: In this paper, the authors interpreted local compression as a product of dextral strike-slip movement along the NE-SW trend of the Tampen Spur in Late Jurassic to Early Cretaceous times.

TL;DR: The Coast Range ophiolite and its cover are interpreted as an incipient intraoceanic volcanic arc, possibly developed above an eastward (continent-ward)-dipping subduction zone within the equatorial Pacific Ocean.

TL;DR: In this article, it is proposed that stylolites represent former open fluid pathways developed in an over-pressured system and that the familiar morphologies were only imposed during compaction as formation pore water pressures declined.

TL;DR: In this article, the authors identify four discrete tectonic phases from the stratigraphy of the area that is now the southern Caribbean and derive the following: (1) Panama arc collistion with Colombia in the Late Miocene/Early Pliocene, which drove a complex triangular wedge bounded by strike-slip faults northward into the Caribbean; (2) right-lateral strikeslip faulting associated with post-Eocene eastern motion of the Caribbean ocean floor into the gap between the separating Americas; (3) island arc development and collision associated with

TL;DR: A detailed magnetic survey was conducted in the Dead Sea, a large sedimentary basin within the Sinai rift as discussed by the authors, and the magnetic anomaly map showed two distinct provinces: in the north the anomaly field trends north-south and decreases towards the east with a gradient of 10 to 20 nT km−.

TL;DR: In this article, two hydrocarbon gas seeps, located about 13 km apart, have distinctive molecular and isotopic compositions, and the source of the gases cannot be positively identified, but the gases probably originate from the thermal decomposition of organic matter in tectonically disturbed upper Cretaceous and/or lower Tertiary sedimentary rocks of passive margin affinity.

TL;DR: In this article, a detailed grid of multichannel seismic reflection profiles from the central Canterbury Basin demonstrates the presence of nine unconformity-bound seismic sequences within a Miocene seafloor sediment prism.

TL;DR: In this article, a linear regression of bottomhole temperature (BHT) measurements vs. associated depths from Michigan's Lower Peninsula results in the following equation relating BHT and depth: BHT(°C) = 14.5 + 0.0192 × depth(m)

TL;DR: The Suvero slide covers an area of about 225 km 2 in the Paola slope basin on the Eastern Tyrrhenian margin this paper, and the shape and lateral extent of the deposit reflect topographic confinement of the slide between the continental slope and a morphologic barrier formed by a margin-parallel slope ridge.

TL;DR: In this article, the authors used single and multichannel seismic reflection profiles from the central part of the Tonga arc system, SW Pacific, are used to interpret its geological evolution.

TL;DR: In this paper, the effects of depositional environmental changes and other geological parameters on the petroleum and groundwater reservoir potentials of the Middle Cretaceous Wasia Formation in central Arabia were studied in detail using subsurface data.

TL;DR: The results of organic geochemical studies of rock samples from Cretaceous strata at Site 603 on the outer Hatteras Rise are reviewed and integrated with their lithostratigraphic information as discussed by the authors.

TL;DR: In this article, X-ray diffraction (XRD), back scattered electron microscopy (BSEM) and electron microprobe analyses were used to examine argillaceous sediments from a partly overpressured Tertiary sequence in a Texas Gulf Coast offshore well.

TL;DR: In this paper, solid bitumens are found in the lower Devonian Ochil Volcanic Formation in the Midland Valley of Scotland, and carboniferous rocks are the more likely source for the bituminous.

TL;DR: A computerized method is described for delimiting beds in a stratal sequence where digital wireline logs provide the database and a number of indices have been developed that characterize the grading of each bed.

TL;DR: In this paper, a revised model for predicting wind-driven currents is suggested, which takes into account either wind friction or latitudinal variations in the Coriolis force, and a preliminary estimate suggests a probability in the range 25-44% for the presence of source rocks beneath actual upwelling sites, derived by analogy with the present day.

TL;DR: In this paper, the main geological factors responsible for the nitrogen content of gas accumulations and for the isotopic composition of methane are outlined and the possible source rock potential of the Permo-Carboniferous fills of the intramontane grabens south of the Variscan front is reported.

TL;DR: In this article, the crustal structure of the magnetic quiet zone outboard of the Otway Basin of the Australian southern margin is interpreted for the whole crustal section using fully processed multichannel seismic reflection data, seismic refraction data and dredge data collected by the Australian Bureau of Mineral Resources (BMR) vessel Rig Seismic, and extrapolation of well control.

TL;DR: The Amirante Trench is a 600 km long and up to 5200 m deep topographic depression whose origin has remained enigmatic as discussed by the authors, however, the analysis of bathymetric and structural data indicate that the trench is not a single, continuous arcuate feature, but is actually a compound feature composed of three discrete, essentially linear segments of differing structural orientations and probable sea-floor spreading origins.

TL;DR: In this article, a mathematical model of primary oil migration as a separate phase out of compacting shales is presented, which is a system of differential equations which relate changes in oil and water saturation in time to water and oil flow out of the source rock during burial.