دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: A kind of white, loose and earthy limestone whose main chemical component is calcium carbonate. Usually used for heavy weight additive of drill fluid.

an often highly porous but lower permeability carbonate composed of fine grained marine sediments such a coccoliths.

n: The powder manufactured by bucking cretaceous lump. Usually used for heavy weight additive of drill fluid.

a marine, single celled (1 to 5+ micron) animal that is a component of chalks.

ad}: of or relating to the geologic period from about 135 million to 65 million years ago at the end of the Mesozoic era, or to the rocks formed during this period, including the extensive chalk deposits for which it was named.

a geological time from 65 million to 140 million years ago.

often massive deposits of coccolith fragments. Usually very high porosity and limited permeability unless fractured.

n: A carbonate sedimentary rock predominantly composed of calcite of organic, chemical or detrital origin. Minor amounts of dolomite, chert and clay are common in limestones. Chalk is a form of fine-grained limestone.