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Lithology identification method

A technology of lithology identification and lithology, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problem of incomplete analysis of fine-grained sedimentary rocks

Active Publication Date: 2015-10-21
PETROCHINA CO LTD
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Problems solved by technology

[0019] The invention provides a lithology identification method to solve the technical problem that the analysis of fine-grained sedimentary rocks is not in place

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Embodiment Construction

[0052] In order to enable those skilled in the technical field to which the application belongs to understand the application more clearly, the technical solutions of the application will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0053] A kind of lithology identification method of the present invention is mainly applied to the identification of fine-grained sedimentary lithology, and the implementation principle of the method is:

[0054] 1. According to the understanding of the general electrical characteristics of mud shale, carbonate rock (limestone, dolomite), sandstone, etc. In carbonate rocks, the acoustic time difference (Δt) decreases gradually, while the bulk density (ρ b ) increases gradually, the neutron porosity gradually decrease in figure 1 In the display mode shown, the relative position change law of the three-porosity logging curve is that AC is first on the right of DEN (CNL) and then on the ...

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Abstract

The invention discloses a lithology identification method. The lithology identification method comprises the steps that firstly, conventional three-porosity (sound waves, density and neutrons) logging measured values of N rock core samples are obtained through the steps of thin section authentication, X-ray diffraction analysis, rock core true depth determination and the like; secondly, the relative distance between two parameters of conventional three-porosity logging is obtained, and the quantitative relation between the relative distance of the two parameters and primary mineral components obtained through X-ray diffraction total rock analysis is obtained according to the relative distance of the two parameters and the mineral components of the N rock core samples; thirdly, rock classification based on the relative distance of the two parameters is established and can be applied to lithology identification of fine grain sedimentary facies area logging, and continuous lithology identification can be carried out on well stratums without core sampled.

Description

technical field [0001] The application relates to the technical field of well logging evaluation in petroleum exploration, in particular to a lithology identification method. Background technique [0002] With the continuous deepening of exploration and development, the deepening of understanding, and the continuous advancement of technology, oil and gas exploration and development have shifted from simple structural oil and gas reservoirs to complex lithologic oil and gas reservoirs, and further extended to more concealed and complex tight oil and gas reservoirs. China's exploration and development practice has demonstrated the huge potential of tight oil, an unconventional oil and gas field. [0003] Tight oil refers to the accumulation of oil that has not undergone large-scale long-distance migration in tight clastic rock or carbonate reservoirs that are sandwiched in or adjacent to high-quality oil-generating formations. It generally has no natural production capacity, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 周立宏蒲秀刚王文革韩文中肖敦清张伟时战楠肖枚柳飒
Owner PETROCHINA CO LTD
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