Reservoir effectiveness identification method based on electrical imaging logging
An identification method and an effective technology, which are applied in the electrical/magnetic detection, measurement, and earth-moving drilling and mining for logging records. easy-to-achieve effects
Active Publication Date: 2011-09-28
PETROCHINA CO LTD
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Although some scholars have studied the opening degree of reservoir fractures, the filling degree of pores and fractures, and the characteristics of pore structure based on conventional data, and then established a relationship with the effective identification of reservoirs, but this understanding often has subjectivity and multiple interpretations.
In addition, although using MDT to measure pressure or calculate permeability based on well logging data can also reflect the effectiveness of reservoirs to a certain extent, MDT logging technology has not yet been widely applied in oilfields. Accurate calculation of the rate has always been a difficult point in the interpretation and evaluation of reservoir logging, so it is also difficult to form an operable effective identification technology method
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[0028] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0029] 1. Calculation of porosity distribution spectrum based on electrical imaging logging
[0030] Through the calculation module of electrical imaging porosity spectrum developed on the CifSun multi-well logging interpretation software platform, the quantitative calculation of porosity spectrum based on electrical imaging logging is realized. Such as figure 1 shown.
[0031] 2. Calculate the three parameters of the porosity spectrum distribution mean, variance and porosity distribution ratio from the electrical imaging porosity spectrum
[0032] In the present invention, at first the specific physical meanings of the three parameters of mean value, variance and porosity distribution ratio are defined (that is: the mean value expresses the degree of main peak deviation from the baseline in the porosity distribution spectrum, and...
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The invention relates to a reservoir effectiveness identification method based on electrical imaging logging, which comprises the following steps of: calculating porosity distribution spectra through electrical imaging logging; calculating the mean value of the porosity distribution spectra, the variance of porosity spectrum form change and the porosity distribution ratio; evaluating reservoir effectiveness on the two-dimensional surface formed from the porosity spectrum mean value and the variance, and dividing into 4 regions according to the range of the porosity spectrum mean value and thevariance; and on the basis of the two-dimensional surface formed from the porosity spectrum mean value and the variance, adding the porosity distribution ratio as third dimensional information for reservoir effectiveness identification, carrying out three-parameter effectiveness evaluation in a three-dimensional space, and further defining the specific instructive significances of different regions to oil field development projects. The coincidence rate of reservoir effectiveness identification is increased, and the overall coincidence rate is 88.6% and is increased by 13% than before.
Description
technical field [0001] The invention relates to a heterogeneous complex fracture-cavity reservoir such as carbonate rock and volcanic rock, a method for evaluating the effectiveness of the reservoir by using the mean value, variance and pore distribution ratio of electrical imaging logging porosity spectrum. Background technique [0002] Carbonate oil and gas reservoirs are an important part of global oil and gas resources. Its conventional oil and gas resources account for about 60% of the world, and its production accounts for about 50%. It is currently a hot spot in oil and gas exploration and development, and it is also a difficult point in reservoir logging evaluation. . A large number of studies have proved that the main factor controlling the productivity of carbonate reservoirs is the connectivity of pores, that is, reservoir availability. However, carbonate reservoirs change rapidly laterally, rock heterogeneity is extremely strong, and matrix porosity is generally...
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Login to View More IPC IPC(8): E21B47/00E21B49/00G01V3/18
Inventor 李宁冯庆付武宏亮王克文冯周
Owner PETROCHINA CO LTD