Method for obtaining oil-water common-layer original oil-containing saturation degree and method for estimating non-test oil-water common-layer original oil-containing saturation degree

A technology of water saturation and saturation, which is applied in earthwork drilling, nuclear radiation exploration, instruments, etc., can solve the problems of large calculation errors and achieve accurate calculation results

Inactive Publication Date: 2009-04-22
DAQING OILFIELD CO LTD
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Problems solved by technology

[0005] In order to solve the problem of large calculation errors in existing methods for obtaining the original oil saturation of the oil-water layer, the present invention proposes a method for obtaining the original oil saturation of the oil-water layer and estimating the original oil saturation of the untested oil-water layer Methods

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  • Method for obtaining oil-water common-layer original oil-containing saturation degree and method for estimating non-test oil-water common-layer original oil-containing saturation degree
  • Method for obtaining oil-water common-layer original oil-containing saturation degree and method for estimating non-test oil-water common-layer original oil-containing saturation degree
  • Method for obtaining oil-water common-layer original oil-containing saturation degree and method for estimating non-test oil-water common-layer original oil-containing saturation degree

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specific Embodiment approach 1

[0064] Embodiment 1. The specific process of a method for obtaining the original oil saturation in the same layer of oil and water described in this embodiment is:

[0065] Step 1. Obtain the relative value ΔGR of natural gamma ray according to the natural gamma ray logging curve:

[0066] Read the natural gamma value GR of oil and water in the same layer and the natural gamma value GR of the pure sandstone layer in the target interval on the natural gamma ray logging curve min and the natural gamma ray value GR of the pure mudstone interval in the target interval max , then by the formula:

[0067] ΔGR=(GR-GR min ) / (GR max -GR min )

[0068] Obtain the relative value of natural gamma ΔGR, in which the natural gamma value GR of the target layer and the natural gamma value GR of the pure sandstone layer in the target interval min and the natural gamma ray value GR of the pure mudstone formation in the target interval max The unit of the relative value of natural gamma ΔG...

specific Embodiment approach 2

[0102] Embodiment 2: The method for estimating the original oil saturation of the untested oil-water layer described in this embodiment is based on the method for obtaining the original oil saturation of the oil-water layer described in Embodiment 1, adding Followed the steps below:

[0103] Step 8. Obtain the average original water saturation of the untested oil-water layer:

[0104] Calculate the water cut of all the zones, and calculate the average water cut of the whole zone, and then use the relative permeability data to establish the water cut. ” to obtain the approximate correction value of the original water saturation of the untested oil-water layer, and then determine the water saturation of the oil-water layer, and then obtain the oil-water layer according to the relationship between the sum of the water saturation and the oil saturation as 100 of oil saturation.

[0105] In this embodiment, the original oil saturation of the untested oil-water layer is estimated ...

specific Embodiment approach 3

[0106] Embodiment 3: This embodiment is an example of the method for obtaining the original oil saturation in the oil-water layer described in Embodiment 1.

[0107] In this embodiment, the P oil layer in the G oilfield is taken as an example for illustration.

[0108] Step 1. Obtain the relative value ΔGR of natural gamma ray according to the natural gamma ray logging curve:

[0109] Read the natural gamma value GR of oil and water in the same layer and the natural gamma value GR of the pure sandstone layer in the target interval on the natural gamma ray logging curve min and the natural gamma ray value GR of the pure mudstone interval in the target interval max , then by the formula:

[0110] ΔGR=(GR-GR min ) / (GR max -GR min )

[0111] Obtain and calculate the relative value of natural gamma ΔGR;

[0112] Step 2. Establishing the shale content interpretation model: V sh = a·ΔGR+b,

[0113] The data of layer 101 from 25 wells in this area are optimized. The variation...

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Abstract

The invention relates to a method for acquiring the initial oil saturation of an oil-water layer and a method for estimating the initial oil saturation of the oil-water layer of untested oil, which relate to a method for calculating the initial oil saturation in a reserve parameter log interpretation. The method solves the problem of large calculation error in the prior method for acquiring the initial oil saturation of the oil-water layer. In the method for acquiring the initial oil saturation of the oil-water layer, the initial oil saturation of a tested oil layer of the oil-water layer is calculated by application of an initial oil saturation model of the oil layer first, and corrected according to interpenetration data and oil testing data to obtain the initial oil saturation of the oil-water layer of tested oil. The method is suitable for the oil-water layer with poor correlation between the initial oil saturation and the resistivity and can be used for calculating the petroleum reserve by the volumetric method. The method for estimating the initial oil saturation of the oil-water layer of the untested oil according to the interpenetration data and the oil testing data is to estimate the initial oil saturation of the oil-water layer of the untested oil by applying and researching the average moisture content of the oil-water layer of a working area.

Description

technical field [0001] The invention relates to a method for calculating the original oil saturation in logging interpretation of reserve parameters, Background technique [0002] With the continuous development of oil exploration in my country, the proportion of oil-water layers in new oil reserves is increasing, and it is increasingly important to accurately calculate the original oil saturation of oil-water layers. [0003] Applicable conditions: The method for calculating the original oil saturation of the oil-water layer is suitable for the oil-water layer with poor correlation between the original oil saturation and the resistivity. [0004] At present, the method for calculating the original oil saturation of oil-water layers in similar reservoirs is to regard the oil-water layer as an oil layer, and use the original oil saturation interpretation model of the oil layer to calculate the "original oil saturation of the apparent oil layer", which is directly used as the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00G01V5/12
Inventor 闫伟林李郑辰殷树军杨永军
Owner DAQING OILFIELD CO LTD
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