A method for evaluating the brittleness of shale reservoirs
An evaluation method and technology for shale reservoirs, which can be used in earth-moving drilling, wellbore/well components, etc., to solve problems such as large density errors, inaccurate brittleness factors, and no good solutions, achieving high sensitivity, eliminating effect of error
Active Publication Date: 2019-10-18
CHINA PETROLEUM & CHEM CORP +1
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[0017] It can be seen that the calculation of shale brittleness factors in the prior art relies on the P-wave velocity, S-wave velocity and density obtained by pre-stack inversion. Due to the limitation of the incident angle (or offset), the density obtained by pre-stack inversion The error is large, therefore, the brittleness factor calculated from this is not accurate
[0018] For the above problems, there is no good solution in the prior art
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[0048]Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0049] figure 1 A flow chart of a shale reservoir brittleness evaluation method according to an embodiment of the present invention is shown. Such as figure 1 As shown, the shale reservoir brittleness evaluation method provided by the embodiment of the present invention may include:
[0050] Step 101, constructing the brittle elastic impedance BEI reflecting the brittleness of the shale formation, wherein the BEI is a function of the elast...
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The invention provides a shale reservoir brittleness evaluating method, and the method comprises the steps of constructing a brittleness elasticity impedance BEI for reflecting a shale stratum brittleness, wherein, the BEI is function of elasticity impedance and a young modulus E of the stratum rock, a Poisson's ratio Sigma and a density Rho that change with different longitudinal wave incidence angles Theta; determining the young modulus E of the stratum rock, the Poisson's ratio Sigma and the density Rho through the BEI corresponding to three different longitudinal wave incidence angles Theta; dividing the determined young modulus E by the determined Poisson's ratio Sigma to obtain the brittleness factor of the shale stratum; and utilizing the brittleness factor to evaluate the brittleness of the shale stratum. In the embodiment, by utilizing the brittleness elasticity impedance BEI constructed for reflecting shale stratum brittleness, the obtained young modulus and the Poisson's ratio are used to evaluate the brittleness of the shale stratum accurately, and are highly sensitive to brittle shale and non- brittle shale.
Description
technical field [0001] The invention relates to the technical field of rock physics earthquake prediction and evaluation, and more specifically, relates to a shale reservoir brittleness evaluation method. Background technique [0002] For shale gas reservoirs, the effect of reservoir stimulation (hydraulic fracturing) directly affects the complexity of the artificial fracture network during the development process. Whether or not as many fractures as possible can be formed with low energy consumption and a good fracturing effect can be achieved depends not only on the fracturing technology, but also on whether the reservoir is suitable for artificial fracturing. Brittleness is a parameter to evaluate the degree of cracking of rocks under the action of external force. Rocks with high brittleness are easy to crack under the action of external force, and rocks with low brittleness are not easy to crack under the action of external force. Generally, the level of brittleness req...
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IPC IPC(8): E21B49/00
Inventor 董宁许杰霍志周周刚
Owner CHINA PETROLEUM & CHEM CORP