Results 131 to 140 of about 96,612 (290)

Confirmation of the impact origin of the Late Ordovician Tvären impact structure (southeast Sweden) and emplacement of impactites in a marine setting

Meteoritics &Planetary Science, EarlyView.
Abstract The Tvären structure in southeastern Sweden has been listed as a confirmed marine‐target impact structure for decades. However, to date, no measurements and/or indexed data of planar deformation features in quartz grains from the structure have been published or any other unequivocal evidence of impact.
Katarzyna J. Gajewska, Sanna Alwmark, Mikael Calner, Sylvain Richoz, Jens Ormö, Erik Sturkell, Carl Alwmark   +6 more
wiley   +1 more source

The brittleness index in hydraulic fracturing [PDF]

, 2015
We present a new definition of a brittleness index which is used as a criterion for candidate selection of rock intervals for hydraulic fracturing. The new index is a combination of material strength parameters and insitu stresses. It was derived from an
Atkinson, C, Papanastsiou, P
core  

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

Meteoritics &Planetary Science, EarlyView.
Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta, Neivaldo Araújo de Castro, Marcos Alberto Rodrigues Vasconcelos, Airton Natanael Coelho Dias, Ludovic Ferrière, Wolf Uwe Reimold, Ana Maria Góes, Jackson Alves Martins, Liliana Sayuri Osako, Raimundo Mariano Gomes Castelo Branco   +9 more
wiley   +1 more source

Geophysical investigation of the Santa Marta impact structure—Piauí State, Brazil

Meteoritics &Planetary Science, EarlyView.
Abstract The Santa Marta impact structure in northeastern Brazil, recognized as a partially preserved complex crater, was investigated through an integrated geophysical study employing magnetotelluric (MT) and gravity methods. Our research provides constraints on the crater's subsurface architecture.
Elienara Vasconcelos, João De Oliveira, Marcos Vasconcelos, Martyn Unsworth, Andrea Santos‐Matos, Florivaldo Sena   +5 more
wiley   +1 more source

Research on 3D digital rock reconstruction and conductive mechanism of nanoscale shale based on deep learning

Youqi dizhi yu caishoulu
Rock resistivity is a critical petrophysical parameter for calculating reservoir water saturation. To address the challenges of complex electrical conduction mechanisms and difficult rock electrical experiments in shale oil reservoirs， a process for ...
LI Zhongxin, CAO Xiaopeng, LÜ Qi, JIANG Long, CHENG Ziyan, CHI Peng, SUN Fujing, LIN Chengyan   +7 more
doaj   +1 more source

Well Records in Panola County Including Structural Contour Map [PDF]

, 1922
University of Texas at Austin
core   +1 more source

Mine Experimental Research of the Power Options of Mechanized Fastening Sections Based on Lithological Structure Coefficient [PDF]

, 2016
The results of simulation systems of the rock-mass using the new mathematical approaches and modern information software are introduced. The contacts of rock mass strata are presented as the curves in the simulation model.
Dychkovskyi, R.О, Falshtynskyi, V.S, Lozynskyi, V.H, Saik, P.B   +3 more
core  

Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure

Meteoritics &Planetary Science, EarlyView.
Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark, J. Granbom, P. Ahlberg, M. Calner, S. Richoz, K. J. Gajewska, W. R. Hyde, K. Ljung, C. Alwmark   +8 more
wiley   +1 more source

CHARACTERISTICS OF OIL SHALES AND SHALE-LIKE ROCKS OF KNOWN DEPOSITS AND OUTCROPS

Oil Shale, 1999
Kaarli Urov, Ada Sumberg
openaire   +1 more source

The Producing Horizon in the Rios Well in Caldwell County [PDF]

, 1922
University of Texas at Austin
core   +1 more source