A method for analyzing the pore size distribution of oil-water occurrence in tight reservoir rocks
A technology for pore size distribution and tight reservoirs, which is applied in the analysis of suspensions and porous materials, analytical materials, permeability/surface area analysis, etc., can solve the problem that the distribution of oil and water cannot fully reflect the actual situation of the reservoir, and achieve the goal of improving accuracy Effect
Active Publication Date: 2022-07-22
DAQING OILFIELD CO LTD +1
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to overcome the problem that the distribution of oil and water in the pores and its characteristics obtained by the existing reservoir rock oil-water occurrence pore size distribution analysis technology in the background technology cannot fully reflect the actual situation of the reservoir
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Embodiment 1
[0039] The analysis method for the occurrence of pore size distribution of oil-water saturation in the tight reservoir rock, the experimental samples used in the experiment were taken from the closed coring of the Fuyu oil layer group in the Qijia-Gulong sag in the northern Songliao Basin. The lithology and oil content of the parallel sample and the sample to be tested are consistent in saturation analysis, and the lithology is mainly fine sandstone, siltstone, and mudstone-bearing calcium-bearing siltstone, argillaceous siltstone, and silty mudstone.
[0040] This experiment was carried out half a year after the reservoir was drilled and coring. The oil-water saturation analysis of parallel block samples started sampling and analysis after the core was raised from the wellbore to the surface. Therefore, the third process was selected for this experiment. The samples to be tested were drilled by water cooling, and the plunger samples were prepared in accordance with the nationa...
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Abstract
The invention relates to a method for analyzing the pore size distribution of oil-water occurrence in tight reservoir rocks. It mainly solves the problem that the pore size distribution characteristics of the existing oil and water in the reservoir rock cannot fully reflect the actual situation of the reservoir. It is characterized in that: the sample to be tested is prepared on the coring section where the oil-water saturation analysis of the sample is carried out, according to the oil-water saturation analysis data of the coring sample and the nuclear magnetic T of the sample and the sample to be tested. 2 After establishing the discriminant condition that the water saturation of the sample to be tested is the real water saturation of the reservoir, the iterative method is used to obtain the real water saturation of the reservoir of the sample to be tested that meets the discriminant condition, and then the magnetic resonance T 2 After the analysis of spectrum and pore size conversion technology, the real pore size distribution of the tested sample and the pore size distribution of reservoir oil and water occurrence are obtained. This analysis method avoids the disadvantage that the distribution of oil and water in the reservoir rock and its occurrence pore size distribution characteristics cannot fully reflect the actual situation of the reservoir in the previous studies on the pore distribution characteristics of oil and water.
Description
technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a method for analyzing the pore size distribution of oil-water saturation in tight reservoir rocks. Background technique [0002] The distribution of reservoir oil saturation in different pore diameters is an indispensable basic data for improving reservoir understanding, studying accumulation mechanism, and formulating oilfield production plans. The application of nuclear magnetic resonance technology in oilfield core analysis is the reservoir pore structure and its fluids. Distribution studies provide the means. At present, the use of nuclear magnetic technology to study the distribution of oil and water saturation in different pore sizes is mainly based on high-speed centrifugal dehydration experiments. 2 Cutoff value or according to post-dehydration T 2 The spectral distribution determines the movable and irreducible water saturation of the e...
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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 曲斌霍迎东武晓鹏杨玉松张文艺谭志伟张珂高岩峰陈艳王刘华
Owner DAQING OILFIELD CO LTD
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