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A method and device for determining the degree of karst development of a reservoir

A kind of development degree and karst technology, applied in the field of logging interpretation, can solve the problems of strong multi-solution, poor operability, and inability to meet the logging evaluation needs of weathering crust karst reservoirs, etc.

Active Publication Date: 2018-11-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention proposes a method and device for determining the karst development degree of reservoirs in order to solve the problems of strong multi-solution, poor operability, and inability to meet the needs of logging evaluation of weathered crust karst reservoirs in the existing karst development degree division method, specifically Including the following technical solutions:

Method used

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  • A method and device for determining the degree of karst development of a reservoir
  • A method and device for determining the degree of karst development of a reservoir
  • A method and device for determining the degree of karst development of a reservoir

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Embodiment 1

[0038] Combine figure 2 As shown, the method for determining the degree of reservoir karst development proposed in this embodiment includes:

[0039] Step 21: Obtain logging data and geological logging data of the pending reservoir.

[0040] The logging data of the undetermined reservoir mainly includes the electrical imaging logging data of the target interval in the study area. It can also include other conventional logging data, geological data, logging data, core description and analysis and other related data to facilitate the analysis of karst development locations. And the stratum level for comprehensive discrimination.

[0041] Step 22: Generate electrical imaging logging image data with full borehole coverage.

[0042] Among them, through the preprocessing, static enhancement, dynamic enhancement, and full borehole image generation processing of the electrical imaging logging data, the full borehole coverage electrical imaging logging image data can be obtained. image 3 As ...

Embodiment 2

[0093] This embodiment provides a device for determining the degree of karst development in a reservoir, combining Figure 7 Shown, including:

[0094] The feature and parameter extraction unit 71 is used to extract vertical dissolution pores and fractures, horizontal dissolution pores and fractures, and logging feature parameters from electrical imaging logging image data of the reservoir to be determined;

[0095] The development degree division unit 72 is used to determine the karst facies zone to which the undetermined reservoir belongs and divide the degree of karst development according to the characteristics of vertical dissolution pores and fractures and horizontal dissolution pores and fractures and statistical logging characteristic parameters;

[0096] The development degree determination unit 73 is used to determine the effective reservoir development degree of the pending reservoir according to the division result of the karst facies belt and the karst development degree....

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Abstract

The invention provides a method and a device for determining the karst development degree of a reservoir, belonging to the technical field of well logging interpretation. The method includes: extracting the characteristics of vertical dissolution pores and fractures and horizontal dissolution pores and fractures from the electrical imaging logging image data of the undetermined reservoir, and counting the logging characteristic parameters; according to the characteristics of the vertical dissolution pores and fractures, the characteristics of horizontal dissolution pores and fractures, and logging characteristic parameters to determine the karst facies zone to which the undetermined reservoir belongs and divide the karst development degree; determine the effective reservoir development degree of the undetermined reservoir according to the division results of the karst facies zone and the karst development degree. The present invention divides the karst development degree of the undetermined reservoir through the vertical dissolution pores and fracture features, horizontal dissolution pores and fracture characteristics and logging characteristic parameters extracted from the electrical imaging logging image data, and can quickly and intuitively identify the karst facies of the reservoir The zone and the degree of karst development are divided, and the identification result is consistent with the core display, which provides important technical support for the exploration and development of oil and gas fields.

Description

Technical field [0001] The invention relates to a method and a device for determining the karst development degree of a reservoir, and belongs to the technical field of logging interpretation. Background technique [0002] Weathering crust karst oil and gas reservoirs are one of the important types of carbonate oil and gas resources. A large number of studies have shown that the key factor controlling the development and distribution of weathering crust karst reservoirs is the degree of karstification. The formation of original formations through karstification Dissolution fractures and caves have an important impact on the improvement of reservoir performance and seepage capacity. Therefore, how to use existing logging methods to accurately identify weathered crust karst reservoirs and classify the degree of karstification can provide important technical basis for determining reservoir effectiveness, submitting oil and gas reserves, and formulating oil and gas well development a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00G01V3/38
CPCE21B49/087G01V3/38E21B47/0025G01V11/00G06T7/0004G06T7/40G06V20/695G06F18/253G01V1/40G01V3/18G06F18/241E21B49/00G06T7/90G01V8/02G06T2207/10024G06T2207/30184
Inventor 李宁武宏亮冯周冯庆付王克文张晓涛张宫
Owner PETROCHINA CO LTD