Recognition method and device of effective reservoirs of dolomite of karstic weathering crust

A technology for reservoir identification and weathering crust, which is applied in earthwork drilling, wellbore/well components, etc., can solve the problems that cannot satisfy the effective reservoir identification of weathering crust dolomite

Active Publication Date: 2012-02-15
PETROCHINA CO LTD
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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a method and device for identifying effective reservoirs of karst weathering ...

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  • Recognition method and device of effective reservoirs of dolomite of karstic weathering crust
  • Recognition method and device of effective reservoirs of dolomite of karstic weathering crust
  • Recognition method and device of effective reservoirs of dolomite of karstic weathering crust

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Embodiment 1

[0024] See figure 1 , figure 1 It is a flowchart of the method for identifying effective karst weathering crust dolomite reservoirs in the first embodiment of the present invention, such as figure 1 As shown, the method includes:

[0025] Step 101: According to the deposition law of karst weathering crust, combining field outcrop observation data and core calibration electrical imaging logging data, establish a weathering crust dolomite reservoir logging sedimentary facies belt interpretation model;

[0026] In this step, the existing weathering crust geological deposition model is first studied in depth. The results show that the research results of previous scholars are basically from the perspective of geological deposition, and the established geological model cannot be compared with the earth logging information. A clear correspondence is established. Therefore, the present invention proposes and establishes a logging sedimentary facies belt interpretation model that can comple...

Embodiment 2

[0044] The embodiment of the present invention provides a device for identifying effective karst weathered crust dolomite reservoirs, such as Figure 7 As shown, Figure 7 It is a schematic diagram of the structure of the device for identifying effective reservoirs of karst weathering crust dolomite in the present invention. The device 700 includes:

[0045] Interpretation model establishment module 710 is used to establish a weathering crust dolomite reservoir logging sedimentary facies interpretation model based on the karst weathering crust deposition law, combined with field outcrop observation data and core calibration electrical imaging logging data;

[0046] The feature map library establishment module 720 is connected to the interpretation model establishment module 710, and is used to analyze the characteristics of different sedimentary facies charged imaging images of the weathering crust dolomite reservoir through logging to establish the characteristics of the weatherin...

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Abstract

The invention provides a recognition method and a device of effective reservoirs of the dolomite of the karstic weathering crust. The method comprises the following steps of: establishing a sedimentary facies belt interpretation model for reservoir logging of the dolomite of the weathering crust; establishing a characteristic chart library for different sedimentary facies belts in the reservoirs of the dolomite of the weathering crust; establishing corresponding relation of different karstic facies belts and effective reservoirs on the basis of typical characteristics of electric imaging of different karstic facies belts and the actual test oil data in an oil field; carrying out recognition on the effective reservoirs in a two-dimensional plane determined by the inclination angle of the formation interface and the productivity of the effective reservoirs; carrying out calculation of mean values and variances on the basis of a porosity spectrum of the electric imaging, determining lower limit values of the porosity and the variance of the effective reservoirs in the two-dimensional plane formed by the mean values and the variances, and carrying out further recognition on the effective reservoirs; recognizing the effective reservoirs of the dolomite of the weathering crust by combining data such as the developmental state of the sedimentary facies belts in the reservoirs of the weathering crust, the size of the inclination angle of the overlying formation and the distribution condition of the mean values and the variances in the porosity spectrum of the electric imaging.

Description

Technical field [0001] The invention relates to an effective reservoir identification technology, in particular to a heterogeneous complex fractured-vuggy reservoir in a karst weathering crust dolomite, a method and a device for identifying an effective reservoir of the karst weathering crust dolomite are proposed. Background technique [0002] Karst weathering crust dolomite oil and gas reservoirs are one of the important types of carbonate oil and gas resources. They are mainly distributed in the Majiagou Formation of Changqing Oilfield, Leikoupo Formation of Southwest Oilfield and Yingshan Formation of Tarim Oilfield. Natural gas reserves account for about 35% of the proven reserves of natural gas in carbonate reservoirs. It is currently one of the hot spots for natural gas exploration and development in my country, and it is also a difficult point for reservoir logging evaluation. A large number of studies have shown that the key factors that control the effective reservoir de...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 冯庆付李宁冯周赵太平石玉江武宏亮王克文柴华
Owner PETROCHINA CO LTD
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