Reservoir stratum identification method

A reservoir identification and reservoir technology, applied in the field of reservoir identification, can solve the problems of accurate identification of effective reservoirs, difficulty in understanding the extension and development of wellbore fractures in lateral changes of reservoirs farther outside the well, and achieve high The effect of applying value

Active Publication Date: 2012-03-14
PETROCHINA CO LTD
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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 fa...

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Embodiment Construction

[0024] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] 1. Based on the radial resolution of different logging tools, firstly divide 4 detection depth zones

[0026] According to the different logging data obtained in the oilfield field, the logging instrument series to which it belongs is determined, and then compared with the characteristic parameters of the logging instrument, four areas are divided into four areas: sticking to the wellbore wall, near the wellbore wall, middle far away from the wellbore wall and super far away from the wellbore wall bring.

[0027] 2. Using micro-CT and electrical imaging logging data to calculate CT spectrum and electrical imaging porosity spectrum respectively

[0028] Preprocess the three-dimensional high-resolution image sequence of the core (mainly including denoising, smoothing, filtering, etc.), and then divide all pixels into pores and...

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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...

Claims

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Application Information

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IPC IPC(8): E21B49/02E21B47/002
Inventor 李宁武宏亮王克文乔文孝鞠晓东陶果冯庆付刘瑞林
Owner PETROCHINA CO LTD
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