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SYNOPSIS. Beds of two entirely different facies types in the Netherlands are considered as being of the same age as the Wealden formation of S. E. England. Firstly, typical lacustrine sediments occurring in the N. E. Netherland, which lithologically and palaeontologically (based mainly on the ostracod-fauna) can be correlated with the German "Wealden" of the N. W. German basin as well as with the beds outcropping in the type locality of the Wealden in S. E. England (see correlation in Fig. I). Secondly, fluviatile-deltaic deposits occurring in S. W. Netherlands, which must be attributed, at least in part, to the Wealden formation, deduced from their stratigraphic position. No diagnostic macro- or micro-fauna has been found in these deltaic beds, so that there is as yet no definite paleontological evidence for the assumption that these beds are equivalent in age to the Wealden formation of S. E. England. Lithologicall?] the beds resemble the ferruginous deposits at Shotover Hill (Oxford), und the Li Fuhse lavers '> in boring Thoren I (near Hanover.) The presumed extent of the lacustrine Sediments in the N. E. Netherlands and the probnble extent of the Fluvintile-Deltaic deposits in the S. W. Netherlands, based on bore-hole data, are given on the palueogeographic sketch-map (Fig. 2). The position and direction is also given of the "Netherlands Ridge", which influenced the sedimentation pattern in the Netherlands from late Palaeozoic to Cretaceous times. RÉSUMÉ. En Hollande, deux unités lithologiques distinctes de faciès complètement différent, ont été considérées comme appartenant au même âge que la formation du Wealdien du sud-est de l'Angleterre. La première unité est formée par des sédiments lacustres typiques présents dans la Hollande nord-orientale, lesquels lithologiquement et paléontologiquement (surtout d'après la faune d' Ostracodes) peuvent être corrélés avec le Wealdien allemand du bassin de l'Allemagne nord-occidentale aussi bien qu'avec les afleurements de la localité type de Wealdien en Angleterre sud-orientale. (Voir la corrélation à la Fig. 1). La seconde unité résulte de dépôts fluviatiles-deltaiques présents en la Hollande sud-occidentale, qui, au moins partiellement, peuvent être attribués, pour leur position stratigraphique, à la formation Wealdien. Dans ces dépôts deltazques nn n'a pas retrouvé de macrofaunes ou de microfaunes significatives, de sorte que pour le moment il n'y a pas de preuve paléontologique définitive que ces dépôts d'un uge équivalent à celui de la formation Wealdien de l'Angleterre sud-orientale. Les couches sont lithologiquement semblables aux dépots ferrugineux de Shot over Hull (Oxford), et aux U couches de Fuhse)) dans le puits Thoren I, près de Hannovre. L'extension présumée des sédiments lacustres en la Hollande n
- Europe > Netherlands (1.00)
- Europe > United Kingdom > England (0.76)
- Phanerozoic > Mesozoic > Jurassic (1.00)
- Phanerozoic > Mesozoic > Cretaceous > Lower Cretaceous > Valanginian (0.55)
- Europe > United Kingdom > England > Southern England > Weald Basin (0.99)
- Europe > Netherlands > North Sea > Dutch Sector > Schoonebeek Field > Bentheim Sandstone Formation (0.99)
- Europe > Netherlands > German Basin (0.99)
- (10 more...)
Abstract At present the processes occurring in the Swash Zone (SZ) are disregarded by all available wave-averaged nearshore circulation models. Only recently a series of studies has proposed an approach to solve this problem by means of Shoreline Boundary Conditions (SBCs) obtained from integrating the Nonlinear Shallow Water Equations over the SZ width. While hydrodynamic conditions are a consolidated and validated theoretical tool, morphodynamic conditions (MSBCs) still require theoretical inspection and experimental validation. We here focus on a theoretical analysis of the problem, which, on the basis of available experimental data, aims at clarifying the role of short- and long-wave contributions to the mentioned MSBCs.
ABSTRACT We present a machine learning workflow that incorporates geophysical (seismic attributes) and geological data, as well as engineering completion parameters, into a model for predicting well production curves. The study area is in southwest Texas in the lower Eagle Ford formation. We make use of functional principal component analysis to summarize the well production time series, and random forest models to predict the functional principal components with geological, geophysical and engineering data as predictors. We are then able to predict the well production time series, with 65–76% accuracy. This method incorporates disparate data types into a robust, predictive model that predicts well production in unconventional resources. Presentation Date: Thursday, October 18, 2018 Start Time: 8:30:00 AM Location: 204B (Anaheim Convention Center) Presentation Type: Oral
- North America > United States > Texas > Fort Worth Basin > Barnett Shale Formation (0.99)
- North America > United States > Texas > West Gulf Coast Tertiary Basin > Eagle Ford Shale Formation (0.98)
- North America > United States > Texas > Sabinas - Rio Grande Basin > Eagle Ford Shale Formation (0.98)
- North America > United States > Texas > Maverick Basin > Eagle Ford Shale Formation (0.98)
Improving production efficiency of multilayer terrigenous Low Carbonic thick series of Arlanskoye oilfield (Russian)
Fedorenko, N. V. (BashNIPIneft LLC, RF, Ufa) | Lozin, E. V. (BashNIPIneft LLC, RF, Ufa) | Gareev, A. G. (BashNIPIneft LLC, RF, Ufa) | Nurov, S. R. (BashNIPIneft LLC, RF, Ufa) | Sibaev, T. V. (BashNIPIneft LLC, RF, Ufa)
The PDF file of this paper is in Russian. Main object development unique Arlanskoye oilfield has exceptionally complex subsurface geology and contains heavy oil with increased viscosity. In section of terrigenous low carbonic thick series, eight productive layers have been identified. Taking into account the heterogeneity of the filtration-capacitive properties of these layers, in the section of the object, it is lawful to single out three packs. The upper one, uniting mainly of three highly permeable layers, predominantly sustained in area, middle pack with four thin middle-permeable layers, and a lower pack, represented by a single high-permeable layer with an extensive aquifer. The layers of the middle pack have deteriorated reservoir properties in comparison with the layers of the upper and lower packs, which influences the development of the multi-layered object. According to the results of development survey and geophysical studies, with the joint operation of packs of the object, the middle pack is characterized by the worst output, both qualitatively and quantitatively. These facts point to the unevenness of the coverage of the layers by waterflooding and the lesser degree of production efficiency from the middle pack. To assess the localization of current oil reserves in the conditions of a multi-layered object, a deep geological and field analysis of production was carried out with the involvement of sectoral geological and hydrodynamic modeling. The carried out analysis made it possible to identify the zones of localization of current oil reserves by section and area. The application of differentiated influence systems on packs and layers - partial disaggregation of the object in the zones of localization of current oil reserves in production and injection wells and application of the targeted program of geological and technical measures will significantly improve the production efficiency of the object's reserves.
Analysis of "Lower Limit Formation" in Low Permeability Sands of Ordos Basin
Xiao, Liang (State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing & Key Laboratory of Earth Prospecting and Information Technology, Beijing, China) | Mao, Zhi-qiang (State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing & Key Laboratory of Earth Prospecting and Information Technology, Beijing, China) | Shi, Yu-jiang (Research Institute of Exploration & Development, Changqing Oilfield, PetroChina) | Guo, Hao-peng (Research Institute of Exploration & Development, Changqing Oilfield, PetroChina)
Abstract With the analysis of reservoir resistivity and diagenetic facies, the reasons of causing "lower limit formation" are expounded in low permeability sandstones of Ordos basin, northwest China. The difference between dry layers and lower limit formations and corresponding recognition method are displayed. In dry layers, the formations undergo the destructive diagenic metamorphism, such as the kaolinite packing action and dense compaction, this lead the formation poor pore structure, low porosity and low permeability, in these kinds of layers, no fluids can be produced. In lower limit formations, the main diagenetic facies are positive, for example, the chlorite line edge feeble denudation diagenetic facies and unstable component denudation diagenetic facies, but some interlayers with destructive diagenetic facies (kaolinite packing action diagenetic facies, dense compaction diagenetic facies or carbonate cementation diagenetic facies) exist, these make formations’ porosity and permeability decrease and are lower than the conventional reservoirs, the physical property parameters are nearly the same with dry layers. The resistivities of lower limit formations are a little higher than dry layers, the resistivity boundary of them is 42 ohm.m. In reservoirs with porosity and permeability lower than the lower limit value of conventional formations, if the main diagenetic facies are positive (although they contain the interlayers with destructive diagenetic facies) and formation resistivity is higher than 42 ohm.m, oil or water can be extracted after some steps are taken.
- Asia > China > Shanxi Province (0.74)
- Asia > China > Shaanxi Province (0.74)
- Asia > China > Gansu Province (0.74)
- Europe > Norway > Norwegian Sea (0.46)
- Geology > Sedimentary Geology (1.00)
- Geology > Rock Type > Sedimentary Rock (0.37)
- Asia > China > Shanxi > Ordos Basin > Changqing Field (0.99)
- Asia > China > Shaanxi > Ordos Basin > Changqing Field (0.99)
- Asia > China > Ningxia > Ordos Basin > Changqing Field (0.99)
- (2 more...)