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
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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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