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Oil-water property identification method and system for compact sandstone oil reservoir

A technology of tight sandstone and identification system, applied in earth-moving drilling, wellbore/well components, etc., can solve problems such as difficulty in identifying oil and water layers

Active Publication Date: 2018-07-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem of difficult identification of oil and water layers in tight sandstone reservoirs, the present invention proposes a method and system for identifying oil and water properties of tight sandstone reservoirs, superimposing acoustic porosity and neutron porosity under certain conditions, using acoustic porosity- The neutron porosity difference can achieve the purpose of intuitive, fast and accurate identification of reservoir fluid properties

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  • Oil-water property identification method and system for compact sandstone oil reservoir
  • Oil-water property identification method and system for compact sandstone oil reservoir
  • Oil-water property identification method and system for compact sandstone oil reservoir

Examples

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Embodiment 1

[0092] A method for identifying oil-water properties of tight sandstone reservoirs, comprising:

[0093] S1 collects reservoir logging data, and calculates the corresponding acoustic porosity and neutron porosity curves by calculating the acoustic time difference and neutron logging curves according to their respective response equations;

[0094] The conversion formula of acoustic porosity is:

[0095]

[0096] In the formula:

[0097] φ s : acoustic porosity, %;

[0098] Δt: Acoustic time difference logging value of target layer, unit μs / ft;

[0099] Δt mac : time difference of sound wave of formation rock skeleton, unit μs / ft;

[0100] Δt f : Formation fluid acoustic time difference, unit μs / ft;

[0101] The neutron porosity conversion formula is:

[0102]

[0103] In the formula:

[0104] φ N : neutron porosity, %

[0105] Φ N : neutron logging value of target layer, unit p.u;

[0106] Φ Nmac : neutron value of formation rock skeleton, unit p.u;

[010...

Embodiment 2

[0119] An oil-water property identification system for tight sandstone reservoirs, including:

[0120] The reservoir data acquisition device is used for collecting reservoir logging data; the reservoir logging data includes natural potential, natural gamma ray, borehole diameter, resistivity curve and three-porosity curve.

[0121] Acoustic transit time and neutron logging data conversion device, used to select acoustic transit time and neutron logging curves, and convert them into corresponding acoustic porosity and neutron porosity curves;

[0122] Among them, the conversion formula used is:

[0123] The conversion formula of acoustic porosity is:

[0124]

[0125] In the formula:

[0126] φ s : acoustic porosity, %;

[0127] Δt: Acoustic time difference logging value of target layer, unit μs / ft;

[0128] Δtmac : time difference of sound wave of formation rock skeleton, unit μs / ft;

[0129] Δt f : Formation fluid acoustic time difference, unit μs / ft;

[0130] The ...

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Abstract

The invention provides an oil-water property identification method for a compact sandstone oil reservoir. The oil-water property identification method comprises the steps that S1, the interval transittime and neutron logging data are collected and converted into corresponding acoustic porosity and neutron porosity curves; S2, the converted acoustic porosity and neutron porosity curves are corrected, thus the acoustic porosity and neutron porosity curves are superimposed on the mudstone formation, and a fluid indicating curve is built; and S3, according to the difference value of the acousticporosity and the neutron porosity in the fluid indicating curve, the oil-water property judging standard of the compact sandstone oil reservoir is determined, and the oil-water property is identified.By adopting the method provided by the invention, the reservoir fluid property can be quickly and accurately identified, and the accuracy of the logging technology in compact sandstone reservoir fluid identification is greatly improved.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and development, and relates to an oil-water property identification method and system suitable for tight sandstone reservoirs. Background technique [0002] Resistivity logging and three-porosity logging (sonic wave, neutron and density) are commonly used logging methods in oil exploration and development to identify reservoir fluid properties in oil and gas reservoirs. However, resistivity logging is easily affected by non-fluid factors such as lithology, wellbore conditions, and mud immersion, especially in tight sandstone reservoirs. It is difficult to accurately identify reservoir fluid properties by using the law of "high resistance in oil layers and low resistance in water layers" in conventional sandstone reservoirs, and the coincidence rate is often lower than 50%. The neutron porosity logging curve of three-porosity logging will produce "excavation effect" phenomenon when the format...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 夏冬冬张庆红李冀秋韩科龙许君玉王英
Owner CHINA PETROLEUM & CHEM CORP
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