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Method for Measuring Liquid Retained Hydrocarbon Content in Shale Using Low Field NMR

A technology of low-field nuclear magnetic resonance and retained hydrocarbons, which is applied in the fields of nuclear magnetic resonance analysis, measuring devices, and material analysis through resonance, which can solve the problems of light hydrocarbon loss and inaccurate measurement results, etc.

Active Publication Date: 2020-12-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, as far as the current method is concerned, both the pyrolysis method and the extraction method will involve the pretreatment of sample crushing, and there will be the problem of light hydrocarbon loss during the sample pretreatment crushing process, and the S 2 The problem of effective measurement of soluble heavy residual hydrocarbons in the

Method used

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  • Method for Measuring Liquid Retained Hydrocarbon Content in Shale Using Low Field NMR
  • Method for Measuring Liquid Retained Hydrocarbon Content in Shale Using Low Field NMR

Examples

Experimental program
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Embodiment 1

[0080] (1) Making a standard sample: fully dissolve the shale oil produced in the shale area to be tested (that is, the block to be tested corresponding to the sample W127 to be tested) in an appropriate volume of distilled water to ensure the lateral relaxation of the shale oil solution The time (T2) is between 10-100ms; take the shale oil solution at a certain volume percentage interval into the standard sample bottle to make a standard sample;

[0081] (2) Measure the transverse relaxation spectrum (T2 spectrum) of the standard sample: the standard sample is placed in the sample groove of the NMR instrument under multiple groups of different echo times and waiting times, and the transverse relaxation spectrum (T2 spectrum) of the standard sample is measured ), and calculate the integral area (NMR signal quantity, dimensionless) of the transverse relaxation spectrum (T2 spectrum), the results are shown in Table 1;

[0082] Table 1

[0083] serial number Water vo...

Embodiment 2

[0092] The method similar to Example 1 was used to detect the liquid retained hydrocarbon content (v%) in the mud shale sample BTZ6 to be tested (the hydrocarbon content calibration curve is not shown), and the results are shown in Table 2.

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Abstract

The invention provides a method of measuring residual liquid hydrocarbon content in shale via low-field nuclear magnetic resonance. A shale sample of any shape is used to saturate manganese chloride solution of sufficient concentration; low-field nuclear magnetic resonance is then performed to obtain a nuclear magnetic T2 spectrum in the shale sample; the shale sample is subjected to dewatering prior to dealkylation; a T2 spectrum signal is measured again; amplitude integral difference delta S of the T2 spectral signal is introduced into a calibration relationship (namely, a marking equation)of hydrocarbon content and the signal, built in the method, so as to calculate hydrocarbon volume in shale of unit volume; the result is that the hydrocarbon volume in shale of unit volume is presented by percentage, which is considered as residual liquid hydrocarbon content in shale. The problems are effectively avoided that samples experience light hydrocarbon loss due to crushing pretreatment and that insufficiency of solvent polarity leads to incomplete extraction of heavy hydrocarbons; the method is suitable for precisely measuring residual hydrocarbon content in shale and is an effectiveand quick measuring method.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration and development, and relates to a method for measuring the content of liquid retained hydrocarbons in mud shale by using low-field nuclear magnetic resonance. Background technique [0002] Shale has extremely low matrix porosity and permeability, and shale oil (liquid retained hydrocarbon) is produced by itself and enriched in the mud shale formation in the form of adsorption, release and dissolution, which can be called in-situ retained oil and gas . Affected by the depositional environment, mineral composition and the abundance, type, maturity and hydrocarbon expulsion efficiency of the organic matter contained therein, the retained hydrocarbon content in different shale has obvious differences. One of the important indicators of economic value assessment. [0003] At present, it is generally believed that the test methods that directly reflect the retained hydrocarbon content ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
CPCG01N24/081
Inventor 钱门辉蒋启贵李志明马媛媛张彩明宋晓莹黎茂稳
Owner CHINA PETROLEUM & CHEM CORP
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