METHOD OF DETECTING HYDROCARBONS IN GEOLOGICAL LAYERS

摘要

P A method for analyzing the hydrocarbon composition of geological layers by analyzing the contents of gaseous hydrocarbons contained in the drilling muds in which, for a given depth range, ratios of gaseous hydrocarbon contents two by two, at substantially identical depth, are established. Then a subset of these ratios is selected to form a signature representative of the gaseous hydrocarbon composition of the depth range. This signature is defined by at least one straight line representing the content of a first gaseous hydrocarbon relative to the content of the gaseous hydrocarbon composition. a second hydrocarbon. This signature is then compared with reference signatures to determine the hydrocarbon content of the geological layer corresponding to the depth range. / P