A METHOD AND SYSTEM FOR DETERMINING A LITHOLOGY OF A SUBTERRANEAN FORMATION

The disclosure relates to a first method for determining a lithology of a subterranean formation (32) into which a wellbore (9) has been drilled. The method comprises receiving (102) a set of measurement logs comprising one or more measurement logs, each representing a measured characteristic of the...

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Bibliographische Detailangaben
Hauptverfasser:	ANDROVANDI, Sophie, RINGER, Maurice, BONDABOU, Karim
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:	The disclosure relates to a first method for determining a lithology of a subterranean formation (32) into which a wellbore (9) has been drilled. The method comprises receiving (102) a set of measurement logs comprising one or more measurement logs, each representing a measured characteristic of the wellbore plotted according to depth. The measured characteristic include at least cuttings percentage and one or more additional measured characteristics. The method also includes segmenting (104) the wellbore into regions based on identified change of trend in one or more of the measurement logs of the set, and sub-segmenting (112) at least one region into zones based on detection of appearance or disappearance of a rock type in the cuttings percentage log, The method also includes determining (114), in each zone, a location, length and rock type of one or more layers based on a total percentage of each rock type in the zone in the cuttings percentage log and at least one of the additional measurement logs.