cap rock

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cap rock

[′kap ‚räk]
(geology)
An overlying, generally impervious layer or stratum of rock that overlies an oil- or gas-bearing rock.
Barren vein matter, or a pinch in a vein, supposed to overlie ore.
A hard layer of rock, usually sandstone, a short distance above a coal seam.
An impervious body of anhydrite and gypsum in a salt dome.
References in periodicals archive ?
Source and cap rocks of Kirthar basin are shales ofJurassic Sulaiman group, Cretaceous Sembar, Gorn and Mughalkot, Paleocene Khadro, Bara and Lakhra, Eocene Shaheed Ghat, Sohnari, Laki and Kirthar formations.
The petrophysical properties and geochemical and mineralogical composition of 24 samples of the Deimena Formation reservoir and Zebre Formation cap rocks from four Baltic onshore and offshore structures were studied and analysed together with previously reported data.
Furthermore, the fracturing of cap rock "can provide pathways for bitumen and steam to flow to aquifers or to the surface, causing significant risk to safety and the environment.
They are asymmetric and the profile lines demonstrate relations with the shape of the salt body but in a global view there is no visible influence of erosion related to permeability of the cap rocks located in the western part of the deposit.
The long term storage of carbon dioxide in this case depends upon the type of mechanism that is used to trap CO2 from anthropogenic sources and its storage in the cap rocks for thousand years.
The underground water penetrated cap rocks at the northern boundary of the salt body and it initiated a subrosion.
Overlying this ancient shoreline are cap rocks (impermeable layers) of the Mississippian Lower Shunda formation and Cretaceous/Jurassic impermeable shales.
the layer of cap rocks is partitioned horizontally in two parts: eastern with gypsum-clay cap rock and western part gypsum cap rocks,
Chalcocite has also been found in altered volcanic cap rocks covering the mineralized intrusive bodies on the west side of the main zone.
The initial drill program will focus on the core area of the porphyry where the leached cap rocks are associated with anomalous copper geochemistry, high conductivity and low resistivity.