shales

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In particular, discontinuous shales, acting as vertical flow barriers, affect significantly the sweep efficiency of oil reservoirs.

Shales and clays are responsible for most natural radioactivity, so the gamma ray log often is a good indicator of such rocks.

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In the transitional region, the middle Cambrian can be divided into Kaili and Jialao Formations marked by muddy shales and muddy limestones.

The Kaili formation in Eastern Guizhou, China is mainly made up of silty mudstone and shales abundant in trilobites.

The continental oil and gas shales are featured by new age, great burial depth, low thermal maturity, and low contents of brittle minerals.

Studies show that the Lower Cambrian black shales in Jindingshan of Guizhou Province are sapropelic type and mixed type oil-forming rocks.

Some of this carbon becomes incorporated into sedimentary rocks such as black shales , the largest reservoir of organic matter on earth.

Fault zones in shales are brecciated and clayey, while those in limestones are of blocky structure.

The Cambrian black shales sediment in anoxia environment, but the degree of reducing was low.

The black shales are characterized by high content of organic matters, and the organic sources are algae and fungi.

Uranium is frequently enriched by sorption or chemical combination in shales , lignites and phosphorites .

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Thus clays and shales tend to be impermeable .

The genetic types of oil shales in the area under research are of humus and mixed type.

The transform from Cretaceous Black Shales to Cretaceous Oceanic Red Beds (CORBs) indicates a change of paleoceanic environment.

The ichthyosaur remains are found in black, bituminous marine shales deposited about 190 million years ago.

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recognizing the type and source of organic matter in lacustrine black shales;

Test Method for Slake Durability of Shales and Similar Weak Rocks