Abstract:

When oil content saturation in carbonate rock reservoirs is>50%,it is called oil layer; when oil content saturation is <10%,it is called water layer. In terms of medium oil, oil bearing rate in rock cores of carbonate rock and rock porosity can be gained by employing rock pyrolysis and interpretation of electrical logging, by calculating visible oil content saturation in the rocks and then reservoir nature can be discriminated. Visible saturation in light oil has no real meaning to discriminate reservoir nature. The discrimination of oil-water strata are mainly based on the gas chromatographic characteristics from organic solvent extractions. Oil-water layers discriminated in Tarim basin with this method have been proved by well drilling.

Key words: carbonate rock, reservoir, organic geochemistry, visible oil content saturation, Tarim basin