Search and Prediction of Reservoirs in the Pre-Jurassic Rock Complex

Author(s):  
A.I. Evdokimova ◽  
A.V. Bobrov
Keyword(s):  
2016 ◽  
Vol 9 (2) ◽  
Author(s):  
Mohamed A. Kassab ◽  
Hesham H. Abuseda ◽  
Nahla A. El Sayed ◽  
Amir M LaLa ◽  
Osama M. Elnaggar

1975 ◽  
Vol 26 (3-4) ◽  
pp. 293-307 ◽  
Author(s):  
Ronald A. Van Overmeeren
Keyword(s):  
Nw Spain ◽  

Geophysics ◽  
1996 ◽  
Vol 61 (3) ◽  
pp. 706-721 ◽  
Author(s):  
Ken Watson ◽  
Lawrence C. Rowan ◽  
Timothy L. Bowers ◽  
Carmen Anton‐Pacheco ◽  
Pablo Gumiel ◽  
...  

Airborne thermal‐infrared multispectral scanner (TIMS) data of the Iron Hill carbonatite‐alkalic igneous rock complex in south‐central Colorado are analyzed using a new spectral emissivity ratio algorithm and confirmed by field examination using existing 1:24 000‐scale geologic maps and petrographic studies. Color composite images show that the alkalic rocks could be clearly identified and that differences existed among alkalic rocks in several parts of the complex. An unsupervised classification algorithm defines four alkalic rock classes within the complex: biotitic pyroxenite, uncompahgrite, augitic pyroxenite, and fenite + nepheline syenite. Felsic rock classes defined in the surrounding country rock are an extensive class consisting of tuff, granite, and felsite, a less extensive class of granite and felsite, and quartzite. The general composition of the classes can be determined from comparisons of the TIMS spectra with laboratory spectra. Carbonatite rocks are not classified, and we attribute that to the fact that dolomite, the predominant carbonate mineral in the complex, has a spectral feature that falls between TIMS channels 5 and 6. Mineralogical variability in the fenitized granite contributed to the nonuniform pattern of the fenite‐nepheline syenite class. The biotitic pyroxenite, which resulted from alteration of the pyroxenite, is spatially associated and appears to be related to narrow carbonatite dikes and sills. Results from a linear unmixing algorithm suggest that the detected spatial extent of the two mixed felsic rock classes was sensitive to the amount of vegetation cover. These results illustrate that spectral thermal infrared data can be processed to yield compositional information that can be a cost‐effective tool to target mineral exploration, particularly in igneous terranes.


2018 ◽  
Vol 36 (36) ◽  
pp. 279
Author(s):  
S. Llana Fúnez

Resumen: El monte Rodiles, situado en el margen oriental de la ría de Villaviciosa, conserva evidencias de ocupación histórica desde sus orígenes como castro romanizado. El asentamiento está limitado en su vertiente sur por los restos de una muralla defensiva, mientras que en la ladera nororiental existen escarpes rocosos que debieron de actuar como defensa del enclave. Este trabajo realiza un análisis del relieve y revisa la estructura del sustrato geológico en el entorno próximo para determinar el origen de los escarpes en la ladera nordeste. Los datos de campo y el análisis de la topografía permiten identificar la existencia de varios deslizamientos que afectan a gran parte de la ladera nororiental del monte Rodiles. La masa deslizada aprovecha la inclinación de la sucesión litológica del Jurásico hacia el NE. La existencia de un nivel de arcillas, mecánicamente incompetentes, por debajo de los conglomerados de la Formación La Ñora, mecánicamente más competentes, permite el movimiento de la ladera hacia el mar. Estos escarpes están además alineados con la terminación lateral de una falla normal Mesozoica reactivada posteriormente como una falla inversa durante el levantamiento de la Cordillera Cantábrica. Las cicatrices de los deslizamientos, desarrolladas sobre niveles métricos de conglomerados fracturados, constituyeron por tanto una defensa natural del enclave histórico.Palabras clave: enclave histórico, deslizamientos, estabilidad de taludes, conglomerados jurásicos.Abstract: The Rodiles hill, on the eastern shores of the Villaviciosa estuary, preserves evidences of historic occupation since the romans. The settlement has a defensive wall in the south and is bounded to the north by a cragged slope to the sea. This work investigates the relief and the structure of the rocks in the area aiming at finding an origin for the crags in the northeastern slope of the hill. Field observations and the analysis of the topography reveal the presence of several landslides that affect most of the northeastern hillside. The dip of the Jurassic rock sequence to the NE and the presence of a two meter-thick layer of shales, mechanically very plastic, below the La Ñora conglomerates Formation, mechanically very competent, favours the slip of the hillside. The scarps are aligned with the lateral termination of a Mesozoic normal fault, reactivated as a reverse fault during the formation of the Cantabrian Mountains. The head scarps at the back of the landslides, developed on fractured conglomerates, constituted a natural defence during the historic settlement.Keywords: historic settlement, slides, slope stability, Jurassic conglomerates.


1966 ◽  
Vol 6 (1) ◽  
pp. 121
Author(s):  
Jon T. Jorgenson ◽  
Robert H. Barton

The Ipswich Basin-Esk Trough Area of south-eastern Queensland was mapped photogeologically with the main emphasis on extending a uniform Jurassic sequence from the Surat Basin located to the west into the area under discussion. The photogeologic units are correlated with the Jurassic Hutton, Evergreen and Precipice formations. The remaining photogeologic units within the Ipswich Basin-Esk Trough Area are correlated with the previously established stratigraphic nomenclature.The structural interpretation agrees regionally with the basic tectonic framework as summarised by Hill (1961). The northern part of the Esk Trough is interpreted to be a westward tilted, compressed fault block. The resulting regional surface structure of the Esk Trough consists of two main synclines separated by a fault zone.The Triassic Esk Trough is unconformably overlapped to the south by the Jurassic rock sequence of the Ipswich Basin. The nature and southern extent of the Esk Trough under the Ipswich Basin is not known. The steeply dipping Mesozoic sequence located immediately west of the town of Ipswich and the asymmetric, faulted, South Moreton Anticline are both on trend with the eastern boundary of the Esk Trough and probably are tectonically related to it. An alignment of igneous intrusives in the south-western part of the Ipswich Basin may be controlled by a southerly trending surface extension of the tectonic line forming the west edge of the Esk Trough.


2017 ◽  
Author(s):  
Agus Laesanpura ◽  
Darharta Dahrin ◽  
Asep Sugianto
Keyword(s):  

Eos ◽  
1998 ◽  
Vol 79 (36) ◽  
pp. 429-429 ◽  
Author(s):  
A. Schulze ◽  
M. Jiang ◽  
T. Ryberg ◽  
R. Gao

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