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A logging method and device for rock brittleness
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A rock brittleness and rock technology, which is applied in the field of rock brittleness logging methods and devices, can solve the problems of inaccurate rock brittleness index, not fully considering the influence of rock brittleness, etc., and achieve the effect of improving accuracy
Active Publication Date: 2018-03-13
PETROCHINA CO LTD
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[0009] The main purpose of the present invention is to provide a logging method and device for rock brittleness, to solve the problem that the existing technology does not fully consider the influence of changes in rock structure and stress environment on rock brittleness, resulting in inaccurate rock brittleness index
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Embodiment 1
[0028] Embodiments of the present invention provide a logging method for rock brittleness, such as image 3 As shown, the method includes the following steps:
[0029] Step S101, using the brittleness index model to obtain the static brittleness index and the dynamic brittleness index of the rock.
[0030] Specifically, the above-mentioned static brittleness index comes from experimental analysis, and the dynamic brittleness index comes from logging data. In this implementation example, the basic characterization method of the rock brittleness index is first determined, that is, the above-mentioned static brittleness index and dynamic brittleness index of the rock.
[0031] In step S103, the dynamic brittleness index is converted into a dynamic and static brittleness index by using a correction model with rock structure characteristics to generate a static brittleness index of the rock under the same stress condition.
[0032] Concrete, wherein same stress condition can be ar...
Embodiment 2
[0109] The embodiment of the invention also provides a rock brittleness evaluation device. like Figure 10 As shown, the device may include:
[0110] The characterization module 201 is configured to use the brittleness index model to obtain the static brittleness index and the dynamic brittleness index of the rock.
[0111] Specifically, the above-mentioned static brittleness index comes from experimental analysis, and the dynamic brittleness index comes from well logging data. In this embodiment, the basic characterization method of rock brittleness index is determined first, that is, the above-mentioned static brittleness index and dynamic brittleness index of rock.
[0112] The conversion module 203 is configured to convert the dynamic brittleness index into a dynamic and static brittleness index by using a calibration model with rock structure characteristics to generate a static brittleness index of the rock under the same stress condition.
[0113] Specifically, wherei...
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Abstract
The invention discloses a logging method and device for the brittleness of rocks. The method comprises that a brittleness index model is used to represent the static brittleness index and the dynamic brittleness index of the rocks; a correction model with the rock structural feature is used to carry out dynamic / static brittleness index conversion on the dynamic brittleness index, and the static brittleness index under the same stress condition of the rocks is generated; and an established rock brittleness strain correction model is used to correct the static brittleness indexes under the same strain condition, and the static brittleness indexes under the rock strain conditions corresponding to the different logging depths of rocks are generated. The problem that change of the rock structure and the strain environment influences the rock brittleness are not taken into consideration in the prior art is solved, and the calculation precision of the logging rock brittleness index is improved.
Description
technical field [0001] The invention relates to the field of petroleum exploration, in particular to a rock brittle logging method and device. Background technique [0002] The shale oil (gas) revolution in North America has changed the world's oil and gas supply pattern. my country is rich in tight oil and gas resources, which is a new and important field of oil and gas exploration in my country. Effective development of tight oil and gas requires large-scale hydraulic fracturing (volume fracturing) to increase productivity. Tight oil and gas require large-scale (volume) fracturing to obtain effective productivity. The continuous brittleness evaluation data of well logging is an important basis for fracturing layer selection and fracturing parameter design of tight oil and gas reservoirs. The brittleness of rock (material) is a qualitative concept, and there is no physical quantity that can effectively and accurately characterize it. The prior art usually uses the static...
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