Method for defining effective thickness of target reservoir bed under complex geological conditions

A technology for complex geological conditions and target reservoirs, applied in the field of determining the effective thickness of target reservoirs, can solve the problems of difficult reservoir thickness, few studies on the tuning law of thin interbeds, etc., and achieve the effect of strong adaptability

Active Publication Date: 2011-06-29
PETROCHINA CO LTD
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  • Abstract
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Problems solved by technology

At present, there are few studies on the tuning rules of thin interbeds, and it is difficult to determine the reservoir thickness under complex geological conditions

Method used

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  • Method for defining effective thickness of target reservoir bed under complex geological conditions
  • Method for defining effective thickness of target reservoir bed under complex geological conditions
  • Method for defining effective thickness of target reservoir bed under complex geological conditions

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Embodiment Construction

[0034] The reservoir thickness estimation technique of the present invention utilizes seismic wave information (namely feature points and amplitude information) to determine the reservoir thickness. Select the target section in the research area to predict the reservoir thickness based on seismic and logging information. After the seismic data are processed with high fidelity and high resolution to obtain the post-stack section, the layers are interpreted finely, and then the thickness of the target reservoir is predicted.

[0035] The present invention is realized through the following steps:

[0036] 1) Artificially stimulate seismic waves in the exploration area, receive underground reflection information, and obtain a zero-angle seismic profile after amplitude-preserving processing; figure 1 is the zero-angle seismic section used to calculate the reservoir thickness in a work area.

[0037] 2) Determine the reservoir thickness of the target interval according to the inte...

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Abstract

The invention belongs to petroleum geophysical prospecting, and relates to a method for defining effective thickness of a target reservoir bed under complex geological conditions, by which the reservoir thickness is confirmed by using seismic wave information (namely, characteristic points and amplitude information). The method comprises the following steps: selecting comprehensive seism and logging information of a target layer section in a studied work area; obtaining a stack profile section after conducting Hi-definition and high resolution process on seism data; then meticulously explaining the position of the layer; and finally performing thickness prediction on the target reservoir bed. By the adoption of the invention, the effective thickness of the target reservoir bed under complex geological conditions can be estimated; and the method is not only suitable for conditions of each thin layer, and but also suitable for conditions that thickness, net sand ratio, thickness of various single layers and distribution manner of an actual thin alternating layer are all intensely changed, is not limited by tuning thickness of the thin layer, and has stronger adaptability.

Description

technical field [0001] The invention belongs to petroleum geophysical prospecting technology, and relates to a method for determining the effective thickness of a target reservoir under complex geological conditions. Background technique [0002] Reservoir prediction under complex geological conditions encounters difficulties due to the limitation of seismic resolution. Reservoir thickness prediction under the condition of thin interbeds is a difficult and hot point at present. Due to thin-bed tuning and distribution of sand-mud interbeds, the thickness picked up by seismic cannot reflect the effective thickness of thin interbedded reservoirs. [0003] Although frequency extension can improve the resolution, the high-frequency information is unreliable, and the influence of wavelet tuning cannot be eliminated. [0004] Seismic trace integration is an unconstrained inversion technology using seismic data, which has a certain correspondence with the wave impedance of the for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01B17/02
Inventor 黄文锋姚逢昌李宏兵
Owner PETROCHINA CO LTD
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