Reservoir fracture identification method and imaging logging reservoir fracture identification method

A technology of fracture identification and imaging logging, which is applied in the fields of seismology and seismic signal processing for well logging records, can solve the problems of high cost, lack of experimental data, leakage interpretation, etc., and achieve intuitive and operable process Strong, accurate effect

Active Publication Date: 2015-10-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the application of imaging logging, there are also problems such as lack of experimental data, insufficient information in the model database, and ambiguity in geological feature recognition.
For example, when image logging is used to identify fractures, half-filled fractures are concealed due to their inconspicuous response, and are often interpreted by leaks; low-angle fractures are not easy to be identified by image logging because they are close to the bedding response
[0005] In addition, more advanced fracture identification technologies such as downhole TV and formation dip have appeared in recent years, but their high cost limits their widespread use

Method used

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  • Reservoir fracture identification method and imaging logging reservoir fracture identification method
  • Reservoir fracture identification method and imaging logging reservoir fracture identification method

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Embodiment 1

[0053] For dual laterolog, due to the intrusion of drilling fluid and drilling fluid filtrate in the fracture development section, the resistivity at the fracture is significantly lower than that of the dense block, showing a relatively low resistivity value on a high-resistivity background . The inhomogeneity of the cracks makes the resistivity curve take the shape of multiple peaks with alternating high and low peaks.

[0054] In general, the dual lateral resistivity at fractures decreases, and the magnitude of the decrease is related to the degree of fracture development, fracture opening, and fluid properties in fractures. In the oil-gas-bearing fracture development section, the difference between the two lateral resistivities becomes larger, and the curve shows a double-track phenomenon.

[0055] In high-angle cracks, the resistivity curve is zigzag, the deep lateral resistivity changes little, and the shallow lateral resistivity is significantly reduced due to the influ...

Embodiment 2

[0089] When the reservoir to be analyzed contains special minerals, it may cause abnormal mutations in the curves of acoustic porosity and density porosity. For this problem, the neutron porosity curve is introduced in this embodiment, and through the comprehensive judgment of the three porosity curves, it is avoided simply because the density porosity curve is higher than the sonic porosity curve, or the sonic porosity curve is higher than the density porosity curve curve, leading to misjudgment of crack types.

[0090] figure 2 A flow chart of the fracture identification method incorporating neutron porosity curves in this embodiment is shown.

[0091] Such as figure 2 As shown, in this embodiment, firstly, in step S201, the lithology information of the reservoir to be analyzed is determined, which is the same as the principle of step S101, and will not be repeated here

[0092] In step S202, according to the lithology information of the reservoir to be analyzed, the ac...

Embodiment 3

[0112] Imaging logging has the characteristics of being able to identify reservoir fracture types and fracture geometric parameters, and it is widely used in occasions where fracture geometric parameters need to be obtained. However, due to the inconspicuous response of half-filled fractures and the close response of some low-angle fractures to bedding, the existing imaging logging has the problem of missing interpretation of the above fractures, which greatly restricts the application of imaging logging. To solve this problem, the present invention also provides a reservoir fracture identification method based on imaging logging.

[0113] It can be known from the above description that the method for identifying reservoir fractures based on conventional well logging described in Embodiment 1 and Embodiment 2 can effectively and accurately identify various types of fractures in the reservoir. Therefore, in this embodiment, the conventional logging method is used to correct the...

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Abstract

The invention discloses a reservoir fracture identification method and an imaging logging reservoir fracture identification method, wherein the reservoir fracture identification method comprises the steps of a step of determining a porosity curve, wherein an acoustic porosity curve and a density porosity curve of a to-be-analyzed reservoir are respectively calculated based on the lithological information of the to-be-analyzed reservoir according to a preset reservoir curve model; a step of determining a porosity curve assembly, wherein the acoustic porosity curve is superposed with the density porosity curve as the porosity curve assembly of the to-be-analyzed reservoir at the dry layer of the to-be-analyzed reservoir; and a step of identifying the type of the fracture, wherein at other layers of the to-be-analyzed reservoir, the acoustic porosity curve is compared with the density porosity curve in the porosity curve assembly, and determining the fracture type of a corresponding layer segment based on the comparison result according to the preset fracture model. The reservoir fracture identification method and the imaging logging reservoir fracture identification method can perform reservoir fracture type identification visually, quickly and reliably, and furthermore can effectively settle a multi-solution problem and a solution omission problem in an existing method.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a reservoir fracture identification method and an image logging reservoir fracture identification method. Background technique [0002] With the continuous development and utilization of oil and gas resources in the world, the direction of oil and gas exploration and development has gradually shifted from conventional oil and gas reservoirs to special oil and gas reservoirs. Among them, the exploration and development of oil and gas reserves in fractured reservoirs is particularly important, and the identification of reservoir fracture types is the basis and focus of logging interpretation and evaluation of fractured reservoirs. [0003] The existing reservoir fracture type identification technology is usually based on dual laterolog or triple porosity log to identify fractures. However, when dual laterolog is used for fracture identification, fac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/48G01V1/50
Inventor 魏修平李浩王丹丹冯琼
Owner CHINA PETROLEUM & CHEM CORP
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