Method for detecting strata, method for calculating oil-gas saturation in strata, composite electrode and detector

Abstract

The embodiment of the invention discloses a method for detecting a stratum, a method for calculating oil and gas saturation of the stratum, a combination electrode and a detector. The method for detecting the stratum includes the steps that measuring signals are transmitted to a target stratum; vector electric potentials and vector currents of reflected signals obtained through the transmitted measuring signals via reflection of the target stratum are measured; first complex resistivity of the target stratum is obtained according to the vector electric potentials and vector currents of the reflected signals; the initial value of an SW is set, and second complex resistivity is obtained by means of a formula; when the difference between the first complex resistivity and the second complex resistivity is less than or equal to a predetermined value, the current SW value is determined as the SW value of the target stratum; when the difference between the first complex resistivity and the second complex resistivity is greater than the predetermined value, the SW value is adjusted according to a predetermined step length until the difference between the first complex resistivity and the second complex resistivity is less than or equal to the predetermined value, and at the moment, the SW value is determined as the SW value of the target stratum; the oil and gas saturation value of the target stratum is obtained according to the determined SW value of the target stratum. Accordingly, the result can be more accurate.

Description

technical field [0001] The invention relates to the technical field of formation exploration, in particular to a method for detecting formations, a method for calculating the oil-gas saturation of formations, a composite electrode and a detector. Background technique [0002] In formation exploration, in order to determine whether the exploration formation has oil and gas recovery value, it is generally determined based on the parameter of oil and gas saturation of the formation. In order to obtain this parameter, it is necessary to obtain other parameters reflecting the original formation through a series of measurements and calculations. These other parameters are used to evaluate the oil and gas saturation of the formation, and then decide whether to exploit, plan for exploitation, and specific exploitation methods to be adopted. [0003] The prior art uses a single scalar parameter to evaluate the oil and gas saturation of the formation. The single scalar parameter is,...

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Problems solved by technology

Since the resistivity or conductivity parameter is greatly affected by the salt salinity of formation water, it is difficult to obtain an accurate value of the resistivity or conductivity parameter. difficulty

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