دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a coarse, metamorphic rock with some parallel alignment of granular minerals and alternate bands of flaky or elongate minerals.

n: finely abraded material occurring between the walls of a fault as the result of grinding movement.

n: in sampling petroleum and petroleum products, a small sample, usually 1.5 millilitres (0.05 ounce),obtained by the probe and sampler in an automatic sampling system. Several grabs constitute a sample. graben n: a block of the earths crust that has slid downward between two faults. Compare horst.

a block of the formation that has slid downward between two faults.

a device that measures an electric field at multiple points at the same time. The gradient is the difference in measured values per unit of distance between the measuring points.

n: a refinery roilt from the ground up. as opposed to one to which an addition or a modification has been made.

n: an instrument used to detect and measure minute differences in the earths gravitational pull at different locations to obtain data about subsurface formations.

a device that measures the local gravitational pull. Gravimeters are useful for determining small changes in the gravity. Very useful for detecting salt domes.

n: 1. the attraction exerted by the earths mass on objects at its surface. 2. the weight of a body. See API gravity. relative density, specific gravity.

n: the ratio of weight of equal volume of two sunbstances, one of which is taken as a standard. Water is taken as a standard of comparison for liquids and solids ( specific gravity ). For gas, air is usually taken ,although hydrogen is sometimes used.

n: the movement of fluids in a reservoir resulting from the force of gravity. In the absence of an effective water or gas drive. gravity drainage is an important source of energy to produce oil. and it may also supplement other types of natural drive. Also called segregation drive.

the movements in a reservoir driven by gravity.