Method and equipment for evaluating reservoir pore structure
A pore structure and reservoir technology, applied in the field of oil and gas field exploration and development, can solve the problems of large fractal dimension error, error, large inversion of nuclear magnetic resonance echo data, etc., and achieve the effect of reducing calculation error and small calculation amount
Active Publication Date: 2019-05-10
CHINA UNIV OF PETROLEUM (BEIJING)
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[0004] However, the inventors have found that there are at least the following problems in the prior art: for tight sandstone reservoirs that are more complex than conventional reservoirs, when performing NMR logging, the inversion of NMR echo data at low signal-to-noise ratios will exist A large error leads to a large error in the calculated fractal dimension
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[0074] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0075] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily Describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or...
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The embodiment of the invention provides a method and equipment for evaluating a reservoir pore structure. The method comprises the following steps: acquiring nuclear magnetic resonance echo data of atarget reservoir; performing time domain transformation on the nuclear magnetic resonance echo data; calculating the square and frequency of the amplitude of the converted nuclear magnetic resonanceecho data; carrying out linear fitting on the quadratic sum and frequency of the amplitude to obtain a fitting straight line; obtaining a slope corresponding to the fitting straight line; calculatinga fractal dimension of the nuclear magnetic resonance echo data according to the slope; evaluating the pore structure of the target reservoir according to the fractal dimension; and automatically carrying out fractal analysis according to the nuclear magnetic resonance echo data to obtain a corresponding fractal dimension. Inversion of the nuclear magnetic resonance echo data is not needed, the calculated amount is small, and the calculation error is reduced.
Description
technical field [0001] The embodiments of the present invention relate to the technical field of oil and gas field exploration and development, and in particular to a method and equipment for evaluating the pore structure of a reservoir. Background technique [0002] In the field of oil and gas development technology, the pore structure of rock refers to the type, size, distribution and interconnection of pores and throats in the rock. Studying the rock pore structure of oil and gas reservoirs and revealing the internal structure of oil and gas reservoirs are of great significance to the exploration and development of oil and gas fields. [0003] At present, in order to evaluate the pore structure of oil and gas reservoirs and obtain the pore structure parameters of oil and gas reservoirs, nuclear magnetic resonance logging is generally used. When it is necessary to evaluate the pore structure of the reservoir, the NMR echo data collected by the NMR logging is usually inver...
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Inventor 谢然红吴勃翰金国文高伦谷明宣
Owner CHINA UNIV OF PETROLEUM (BEIJING)