Sandstone reservoir water layer resistivity-based stratum data processing method

Abstract

The invention relates to a sandstone reservoir water layer resistivity-based stratum data processing method, which belongs to a resistivity-based reservoir attribute identification method and is suitable for identifying underground water layers. The method comprises the following steps: acquiring reservoir lithology data by using geological exploration equipment; analyzing the acquired reservoir lithology data with analysis equipment to acquire total sandstone porosity, bound water saturation, stratum water density, stratum crude oil density, movable stratum water resistivity, stratum bound water resistivity, mud and mud filtrate resistivity, true sandstone water layer resistivity, stratum fluid replacement rate and mud filtrate distribution coefficient; and finally, acquiring polluted sandstone water layer apparent resistivity, and judging whether the sandstone reservoir is the water layer by comparing the numerical relationship between the apparent resistivity and true resistivity of the sandstone reservoir depth side direction and the measured resistivity. By analyzing the pollution degree of the sandstone reservoir around a borehole, the method avoids mistakenly jetting the water layer when the hydrocarbon reservoir is put into development and perforation, reduces inaccurate judgment for abnormality, and reduces the development cost.

Description

technical field [0001] The invention relates to a geophysical exploration and development method, in particular to a stratum data processing method based on the resistivity of a sandstone reservoir water layer, which belongs to a resistivity-based stratum attribute identification method, and is especially suitable for identifying groundwater layers. More specifically, the invention relates to the category of comprehensive interpretation and evaluation of massive logging information, and to the field of data acquisition, testing and analysis of formation lithology parameters. Background technique [0002] Rapid and accurate evaluation of oil and water layers has always been a technical problem for oilfield exploration and development scientists to solve. At present, there are five main methods for evaluating oil and water reservoirs: [0003] One is coring method: through direct observation of drilling coring (system coring, see display coring and wellbore coring), the oil-b...

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Problems solved by technology

The patent uses the repeatedly adjusted irreducible water saturation to achieve the consistency between the estimated resistivity and the measured resistivity, and uses the adjusted irreducible water saturation to estimate the hydrocarbon volume. The patent increases or decreases the formation resistivity caused by mud invasion are all attributed to irreducible water saturation, thus directly reducing the confidence of hydrocarbon volume estimates using adjusted irreducible water saturation

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