Reservoir stratum identification method

Abstract

The invention relates to a reservoir stratum identification method, which comprises the following steps of: separating out a contact well wall zone, a near well wall zone, a far well wall zone and an ultra far well wall zone according to the detection depth properties of different logging instruments; extracting the stratum seam hole development information of the contact well wall zone by using a micro computed tomography (CT) porosity analysis or electric imaging spectrum resolving technology; acquiring the stratum seam hole development condition of the near well wall zone based on dipolar sound wave logging data; acquiring the stratum seam hole development condition of the far well wall zone based on small-angle nearly perpendicular azimuth reflecting sound wave logging data; discovering a seam hole development belt in the stratum of the ultra far well wall zone based on well side seismic channel data; and judging whether the reservoir stratum has industrial capacity based on seam hole information extraction of the four detection depth zones. By establishing the effective reservoir stratum identification method with depth detection gradient and azimuth directing capacity, the identification coincidence rate of the effective reservoir stratum is improved, and a powerful technical support is provided for implementing the strategic goals of 'high yield in rare wells and high efficiency in sparse wells' in Chinese major oilfields.

Description

technical field [0001] The invention relates to heterogeneous complex reservoirs such as carbonate rocks, volcanic rocks, and clastic rocks, and uses a logging technology series capable of detecting depth levels and azimuth orientations to identify effective reservoirs. Background technique [0002] With the continuous deepening of oil and gas field exploration and development, the main parts of most oil fields in China have entered the stage of high-mature exploration, and the exploration targets have gradually shifted from structural oil and gas reservoirs to hidden oil and gas reservoirs such as lithology and stratigraphy. Exploration and development are becoming more and more difficult in the four major areas of land, deep and old areas. Heterogeneous and complex fractured-vuggy reservoirs represented by carbonate rocks and volcanic rocks are currently hot spots in domestic oil and gas exploration and development, and are also difficult points in reservoir logging evalua...

AI Technical Summary

Problems solved by technology

This brings great difficulty to the accurate identification of effective reservoirs

In addition, the effective detection depth of existing logging instruments is generally distributed in the range of 0-1.5 meters, and it is difficult to understand the lateral changes of reservoirs farther outside the well or the extension and development of wellbore fractures. The results are contradictory, so it is urgent to study the processing and interpretation methods of deep sounding logging tools and logging data based on direct measurement of reflected wave energy attenuation

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