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Tight reservoir rock oil water occurence aperture distribution analysis method

A technology for pore size distribution and tight reservoirs, applied in suspension and porous material analysis, material analysis, permeability/surface area analysis, etc. Analyze accurate results

Active Publication Date: 2019-09-13
DAQING OILFIELD CO LTD +1
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Problems solved by technology

[0007] 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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  • Tight reservoir rock oil water occurence aperture distribution analysis method
  • Tight reservoir rock oil water occurence aperture distribution analysis method
  • Tight reservoir rock oil water occurence aperture distribution analysis method

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Embodiment 1

[0042] The analysis method for the distribution of pore size distribution of oil-water saturation in tight reservoir rocks. The experimental samples used in the experiment were taken from the sealed coring of the Fuyu oil formation in the Qijia-Gulong sag in the northern Songliao Basin. The representative samples used in this experiment were selected. The lithology and oiliness of the parallel sample for saturation analysis and the sample to be tested are consistent, and the lithology is mainly fine sandstone, siltstone, and siltstone with mud and calcium, argillaceous siltstone, and silty mudstone.

[0043] This experiment was carried out half a year after the core was drilled in the reservoir. The analysis of the oil-water saturation of the parallel sample block sample was carried out after the core was lifted from the wellbore to the ground. Therefore, the third procedure was selected for this experiment. The sample to be tested was drilled by water cooling, and the plunger ...

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Abstract

The present invention relates to a tight reservoir rock oil water occurrence aperture distribution analysis method, and mainly solves the problem that the existing occurrence aperture distribution characteristics of oil water in reservoir rocks cannot fully reflect actual situations of the reservoir. The method is characterized in that: Preparing a sample to be tested on a core layer on which sample oil water saturation analysis is carried on, according to oil water saturation analysis data of a coring sample, the sample and nuclear magnetic T2 spectrum distribution of the sample to be tested,after establishing a criterion that water saturation of the sample to be tested is true water saturation of the reservoir, using iterative method to obtain the true water saturation of the reservoirof the sample to be tested that satisfies the criterion, then after the magnetic resonance T2 spectrum and aperture conversion technology analysis, obtaining the true aperture distribution of the sample to be tested and aperture distribution of the reservoir oil water occurrence. The analysis method avoids the disadvantages that the distribution of oil water in the reservoir rock and the occurrence aperture distribution characteristics cannot fully reflect the actual situation of the reservoir in the prior study of oil water aperture distribution characteristics.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to an analysis method for the distribution of pore diameters of oil-water saturation in tight reservoir rocks. Background technique [0002] The distribution of reservoir oil saturation in different pore sizes is an indispensable basic data for improving reservoir understanding, reservoir-forming mechanism research, and formulation of oilfield production plans. 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. After the experimental samples are dehydrated under a predetermined centrifugal force, the sample NMR measurement experiment is carried out. Through the NMR T 2 cut-off value or according to T after dehydration 2 The spectral distribution determines the saturat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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