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Determination method and device of oil deposit water saturation

A technology for determining methods and devices, applied in the field of petroleum exploration

Active Publication Date: 2019-09-10
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0003] Since there are many parameters in the seepage field of the reservoir, and the change of each parameter can lead to the change of the P-wave velocity, this makes the Biot equation become an indeterminate equation, which also causes the multi-solution of the inversion
This is also the reason why the industry currently lacks methods for inverting water saturation based on P-wave velocity.

Method used

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  • Determination method and device of oil deposit water saturation
  • Determination method and device of oil deposit water saturation
  • Determination method and device of oil deposit water saturation

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Embodiment Construction

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] In the prior art, there is no problem of inverting the water saturation directly based on the P-wave velocity. The present invention proposes a method of inverting the water saturation by using the P-wave velocity to provide a technical solution for determining the water saturation.

[0040] The invention provides a method for determining the water saturation of a reservoir, such as figure 1 As shown, the method includes:

[0041] Step S101, obtaining ...

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Abstract

The invention provides a determination method and device of oil deposit water saturation. The determination method includes the steps that petrophysical parameters and seepage parameters are obtainedfrom oil deposit data; a longitudinal wave velocity field is determined according to seismic data; and a Biot equation is used for determine the oil deposit water saturation according to the oil deposit petrophysical parameters, seepage parameters, and determined longitudinal wave velocity field. According to the determination method and device, a petrophysics experiment, digital core experiment and well production record are used, other petrophysical parameters and seepage parameters in addition to the saturation related to longitudinal wave velocity and relation between the water saturationand the longitudinal wave velocity in the Biot equation are combined, and thus the oil deposit water saturation is determined. The determination method is short in time and high in operability, and large-scale application technology prospect is realized.

Description

technical field [0001] The invention relates to petroleum exploration technology, in particular to a method and device for determining the water saturation of an oil reservoir. Background technique [0002] Studying the distribution of water saturation is of great significance for understanding the distribution of oil reserves and determining the transition of oil-water and oil-gas. In the process of oil extraction, the water saturation in the reservoir is changing all the time, which will inevitably lead to the change of the compressional wave velocity of the reservoir. This also means that changes in water saturation can be monitored through changes in P-wave velocity. [0003] Since there are many parameters in the seepage field of the reservoir, and the change of each parameter can lead to the change of the P-wave velocity, this makes the Biot equation become an indeterminate equation, which also causes the multi-solution of the inversion. This is also the reason why t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00Y02A10/40
Inventor 韩斯成李廷辉李玉海曾天玖赵贻水王者武
Owner BC P INC CHINA NAT PETROLEUM CORP
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