Method for calculating total organic carbon content based on lithology correction

• Main Authors: WANG MIN, MENG LEI, QIN DONGFENG, YAN HUA, ZHOU DEZHI, CHEN BING, FU AIBING, NI ZIGAO, ZHANG LI
• Format: Patent
• Language: Chinese; English
• Published: 23.05.2023
• Subjects: 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

The invention relates to the technical field of oil exploration, in particular to a method for calculating the total organic carbon content based on lithology correction. The method comprises the following steps: establishing a relational expression between the shale content and the interval transit time and a relational expression between the shale content and the resistivity in a pure mudstone section without organic matters; establishing a relational expression between the ash content and the interval transit time and a relational expression between the ash content and the resistivity in a limestone section which does not contain organic matters; obtaining delta t correction and R correction which are only influenced by the total organic carbon content; obtaining delta t increment and R increment reflecting the total organic carbon influence degree; and calculating the total organic carbon content after lithology correction. According to the method, the influence of lithology on the logging curve is effect