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Method for identifying tight sandstone reservoir oil-water layer

A technology for tight sandstone reservoirs and oil-water layers, which is applied in the field of oil and gas field exploration and development, can solve problems such as errors in calculating oil content, and achieve the effects of small errors and accurate logging results.

Inactive Publication Date: 2017-11-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

China Petroleum and Chemical Standards and Quality "Using Nuclear Magnetic Resonance Logging Data to Identify Oil and Water Layers" (No. 23, 2014) describes the identification of oil and water layers through time domain analysis, difference spectrum and enhanced diffusion, in which time domain analysis and difference spectrum identify oil and water The main problem of the layer is that there is a large error in the calculation of the oil content

Method used

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  • Method for identifying tight sandstone reservoir oil-water layer
  • Method for identifying tight sandstone reservoir oil-water layer
  • Method for identifying tight sandstone reservoir oil-water layer

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Experimental program
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Embodiment

[0042] 1. Sampling:

[0043] On the oilfield site, Wells HH162 and Well HH168 were selected for the Honghe block of Sinopec North China Oil and Gas Company, and core samples containing oil and water were continuously collected in closed coring according to the sampling depth. There were 41 cores in Well HH162 and 68 cores in Well HH168. The size of the core samples can be different Regularly, it needs to be able to be put into a sample tube with a diameter of 2.5cm and a length of no more than 4cm. The collected core samples are sealed in NMR sample tubes.

[0044] 2. Calculate the movable fluid saturation of the core:

[0045] In the nuclear magnetic resonance core analyzer (PKU uni-Quanta, model: UNIQ PMR), the oil-bearing and water-bearing core samples were collected successively according to the sampling depth, and the oil- and water-phase NMR T of each core was obtained. 2 Spectrum.

[0046] figure 1 is the oil and water phase T of one of the cores 2 Spectrum, abscis...

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Abstract

The invention provides a method for identifying oil-water layers in tight sandstone reservoirs, the method comprising the following steps: (1) performing nuclear magnetic resonance T2 spectrum measurement on oil- and water-containing tight sandstone reservoir cores obtained from sealed coring to obtain core oil and water phases T2 spectrum, calculate the movable fluid saturation M of the rock core; (2) process the rock core to shield the nuclear magnetic resonance signal of the water in the rock core, carry out the NMR T2 spectrum measurement on the processed rock core again, obtain the core oil phase T2 spectrum, calculate The oil saturation S of the rock core; (3) comparing the movable fluid saturation and the oil saturation, and judging the type of the oil-water layer of the rock core. The present invention utilizes the nuclear magnetic resonance technology to analyze and study the on-site airtight coring cores of tight sandstone reservoirs in oil field experiments, which can accurately identify the oil and water layers of tight sandstone reservoirs and determine, interpret and evaluate them, and can also calibrate and compare well logging interpretation results. The well results are accurate and the error is small.

Description

technical field [0001] The invention relates to the field of exploration and development of oil and gas fields, and more specifically relates to a method for identifying oil and water layers in tight sandstone reservoirs. Background technique [0002] With the advancement of oil exploration and development technology, the exploration and development of tight sandstone reservoirs has become a major component of the petroleum industry. The pores of tight sandstone reservoirs are very small, and effective identification of oil and water layers in tight sandstone reservoirs is of great significance for the development of such oilfields. important meaning. At present, nuclear magnetic resonance core analysis technology is mainly to quantitatively obtain reservoir evaluation parameters such as porosity, permeability, movable fluid saturation, and oil saturation, and use the above parameters to interpret and evaluate reservoir physical properties and oil-water layers. [0003] Jou...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/081
Inventor 郎东江伦增珉吕成远潘伟义王海涛王锐赵春鹏周霞赵清民张栋
Owner CHINA PETROLEUM & CHEM CORP
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