Dual laterolog is a key to determine whether the stratum contains oil or not. However, due to impact of reservoir thickness, thin interbed oil reservoir, mud invasion and other factors, the discrimination capacity for oil and gas layers of the logging information is limited, bringing difficulties for oil and gas layer interpretation. Based on the electrical logging theory and fast forward numerical calculation method, this paper simulatesdual laterolog responseunder different reservoir conditions and analyzes its characteristics, revealing factors influencing the dual laterolog. On this basis, the inversion algorithm was used to carry out preprocessing of the dual laterolog data, calculatethe virgin zone resistivity, flushed zone resistivity and invasion radius, realizingthe environmental correction of dual lateral logging data. Applications show that this method can effectively eliminate environmental influenceon dual laterolog, and identify oil, gas and water layers with high accuracy, meeting engineering demand.
Key words
dual laterolog /
response characteristics /
environmental correction
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References
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