Zur Physik der Taubildung an der Erdoberfläche     

Julius Drimmel 《Meteorology and Atmospheric Physics》1956,9(3):343-356

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Detrital clay grain coats in estuarine clastic deposits: origin and spatial distribution within a modern sedimentary system,the Gironde Estuary (south‐west France)     

Maxime Virolle  Benjamin Brigaud  Raphaël Bourillot  Hugues Fnis  Eric Portier  Thibault Duteil  Julius Nouet  Patricia Patrier  Daniel Beaufort 《Sedimentology》2019,66(3):859-894

Porosity and permeability may be preserved in deep sandstone reservoirs by clay coating (mainly chlorite) which limits quartz overgrowths. Chloritization around quartz grains results mainly from mineralogical transformations of pre‐existing clays. It is fundamental to study those clay precursors to better understand and predict the location and distribution of clay coatings in subsurface sandstones for petroleum or geothermal prospecting. This paper reports a high‐resolution analysis of the composition, distribution and fabric of clays along a modern estuary, the Gironde (south‐west France). The scale of the study ranges from thin sections, through sand bar bodies, up to the entire estuary. Results show that clays are detrital and deposited at the same time as sand grains despite strong hydrodynamic conditions. Clays bind to medium‐grained sands forming detrital clay grain coats. On average, 26% of detrital sand grains are coated along the entire length of the estuary. Coat thickness varies from 1 μm to more than 200 μm, and coat coverage exceeds 30% in some samples. The turbidity maximum zone position (surface water turbidity from 1 to 10 g l^?1) in the estuary, which is controlled by seasonal variations in hydrodynamic processes, significantly impacts the location of the maximum clay content and the abundance of coated grains in sandy facies along the estuary. Flocculation in the water column results in the accumulation of suspended matter and contributes to the high turbidity in the estuary. Exopolymeric substances produced by diatoms are observed both in the field and by cryo‐scanning electron microscopy, suggesting that they may play a major role in binding detrital clay around sand grains. Finally, tidal bars and heterolithic point bars in the estuary funnel and estuarine channels are prime sedimentological targets for finding clay coatings and potentially good reservoir quality in deeply buried sandstones.  相似文献   

Application of data assimilation for improved operational water level forecasting on the northwest European shelf and North Sea   总被引：2，自引：1，他引：1  

Firmijn Zijl  Julius Sumihar  Martin Verlaan 《Ocean Dynamics》2015,65(12):1699-1716

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Gravity for Detecting Caves: Airborne and Terrestrial Simulations Based on a Comprehensive Karstic Cave Benchmark     

Carla Braitenberg  Daniele Sampietro  Tommaso Pivetta  David Zuliani  Alfio Barbagallo  Paolo Fabris  Lorenzo Rossi  Julius Fabbri  Ahmed Hamdi Mansi 《Pure and Applied Geophysics》2016,173(4):1243-1264

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Hydrocarbon reservoir characterization of “AY” field,deep-water Niger Delta using 3D seismic and well logs     

Oluseun Adetola Sanuade  Adesoji Olumayowa Akanji  Michael Adeyinka Oladunjoye  Abayomi Adesola Olaojo  Julius O. Fatoba 《Arabian Journal of Geosciences》2017,10(6):151

Three-dimensional seismic and well log data from nine wells were used for the characterization of “AY” field in the deep-water, Niger Delta. Result shows that the field has a complex structural arrangement consisting of series of northeast-southwest-trending and northwest-dipping synthetic faults. Petrophysical evaluation of the available well logs helped in identifying 11 hydrocarbon-bearing sands noted as A1000, A1100, A1200, A2000, B2000, B2100, C3000, C3100, D4000, D4100, and E5000. Reservoirs A1000, A1100, A1200, A2000, B2000, C3000, and D4000 are gas-bearing sands while reservoirs B2100, C3100, D4100, and E5000 are oil bearing. The average effective porosity of these reservoirs ranges from 0.168 to 0.292; water saturation is estimated to be between 0.177 and 0.59 and net-to-gross (NTG) ratio from 0.081 to 0.734. Considering the uncertainty in the input petrophysical parameters as well as structural uncertainty particularly in fluid contact, the total hydrocarbon reserves in the field were estimated to vary between 266.942 and 334.457 Bscf and 132.612 and 150.036 MMbbl for gas and oil volumes, respectively.  相似文献   

The use of multivariate statistical analysis in the assessment of groundwater hydrochemistry in some parts of southwestern Nigeria     

Fatoba  Julius Ogunmola  Sanuade  Oluseun Adetola  Hammed  Olaide S.  Igboama  Wilfred W. 《Arabian Journal of Geosciences》2017,10(15):1-19

Arabian Journal of Geosciences - Turabah area is located in the southwestern Arabian Shield of Saudi Arabia. The present study aims to shed light on the origin and mechanism of formation of the...  相似文献   

Solitary waves in shallow water hydrodynamics and magnetohydrodynamics in rotating spherical coordinates     

Steven D. London 《地球物理与天体物理流体动力学》2018,112(1):62-73

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Characterisation of ground motion recording stations in the Groningen gas field     

Rik Noorlandt  Pauline P. Kruiver  Marco P. E. de Kleine  Marios Karaoulis  Ger de Lange  Antonio Di Matteo  Julius von Ketelhodt  Elmer Ruigrok  Benjamin Edwards  Adrian Rodriguez-Marek  Julian J. Bommer  Jan van Elk  Dirk Doornhof 《Journal of Seismology》2018,22(3):605-623

The seismic hazard and risk analysis for the onshore Groningen gas field requires information about local soil properties, in particular shear-wave velocity (V_S). A fieldwork campaign was conducted at 18 surface accelerograph stations of the monitoring network. The subsurface in the region consists of unconsolidated sediments and is heterogeneous in composition and properties. A range of different methods was applied to acquire in situ V_S values to a target depth of at least 30 m. The techniques include seismic cone penetration tests (SCPT) with varying source offsets, multichannel analysis of surface waves (MASW) on Rayleigh waves with different processing approaches, microtremor array, cross-hole tomography and suspension P-S logging. The offset SCPT, cross-hole tomography and common midpoint cross-correlation (CMPcc) processing of MASW data all revealed lateral variations on length scales of several to tens of metres in this geological setting. SCPTs resulted in very detailed V_S profiles with depth, but represent point measurements in a heterogeneous environment. The MASW results represent V_S information on a larger spatial scale and smooth some of the heterogeneity encountered at the sites. The combination of MASW and SCPT proved to be a powerful and cost-effective approach in determining representative V_S profiles at the accelerograph station sites. The measured V_S profiles correspond well with the modelled profiles and they significantly enhance the ground motion model derivation. The similarity between the theoretical transfer function from the V_S profile and the observed amplification from vertical array stations is also excellent.  相似文献   

Solitary waves in shallow water magnetohydrodynamics     

Steven D. London 《地球物理与天体物理流体动力学》2017,111(2):115-130

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A simple and efficient GIS tool for volume calculations of submarine landslides   总被引：1，自引：1，他引：0  

David Julius Völker 《Geo-Marine Letters》2010,30(5):541-547

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