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Characterization and evaluation method of hydrocarbon generation and expulsion for source rock pyrolysis/shale oil in-situ upgrading

An evaluation method and in-situ modification technology, applied in the preparation of test samples, material analysis using wave/particle radiation, and measurement devices, etc., can solve the problems of rock microstructure changes, product discharge process, etc.

Active Publication Date: 2020-11-06
PETROCHINA CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

However, the existing technology has not conducted a lot of research on the microstructure changes of internal pores, kerogen generation and expulsion hydrocarbons, and product discharge process after rock heating in the process of underground in-situ heating

Method used

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  • Characterization and evaluation method of hydrocarbon generation and expulsion for source rock pyrolysis/shale oil in-situ upgrading
  • Characterization and evaluation method of hydrocarbon generation and expulsion for source rock pyrolysis/shale oil in-situ upgrading
  • Characterization and evaluation method of hydrocarbon generation and expulsion for source rock pyrolysis/shale oil in-situ upgrading

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Embodiment

[0054] This example provides a hydrocarbon generation and expulsion characterization and evaluation method for source rock pyrolysis / shale oil in-situ upgrading, such as figure 1 shown, including the following steps:

[0055] Step 1. Collect the source rock rock samples of the Proterozoic Xiamaling Formation (which can be oil source rocks, gas source rocks, mudstone, mud shale, shale or shale oil reservoir rock samples); the TOC is 1%- 20%, kerogen maturity Ro is 0.1%-3.0%.

[0056] Step 2. Select the direction vertical to the formation, such as Figure 5 As shown, 5 pieces of cylindrical samples with a diameter of 5mm are drilled with a diamond drill, and the cylindrical samples are as follows figure 2 As shown, the samples are guaranteed to have the same upper surface, all cut according to the length of 5mm, the upper surface is polished (metallographic polishing method), and then argon ion polishing is performed to obtain a small cylindrical sample with a diameter of 5mm...

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Abstract

The invention provides a hydrocarbon generation and expulsion characterization and evaluation method of source rock pyrolysis / shale oil in-situ modification. The hydrocarbon generation and expulsion characterization and evaluation method comprises the following steps of collecting source rock / shale oil reservoir rock samples; drilling multiple cylinder samples from one sample; performing polishingtreatment to obtain samples to be detected; performing CT imaging and scanning electron microscope imaging on the top surfaces of all the samples to be detected; performing pyrolysis on all the samples to be detected; performing CT imaging and scanning electron microscope imaging on all the samples to be detected after pyrolysis again, and comparing two change information; and according to acquired change information in two-dimensional distribution of residual oil, selecting samples, the surfaces of which do not have obvious charging phenomenon, to be detected after pyrolysis in scanning electron microscope imaging for further splitting as YZ sections, using scanning electron microscope imaging to acquire two-dimensional distribution information of residual oil of the YZ sections, correspondingly establishing three-dimensional distribution ellipsoids of the residual oil, and finally, combining pyrolysis parameters and CT imaging information of the samples to be detected to acquire hydrocarbon generation and expulsion characterizations. The hydrocarbon generation and expulsion characterization and evaluation method provided by the invention is simple and effective.

Description

technical field [0001] The invention relates to a hydrocarbon generation and expulsion characterization and evaluation method for source rock pyrolysis / shale oil in-situ modification, and belongs to the technical field of petroleum exploitation. Background technique [0002] Source rocks are one of the key factors controlling the formation and distribution of oil and gas reservoirs. With the exploration and development of shale oil and gas, source rocks become oil and gas reservoirs at the same time, making the evaluation of source rocks more meaningful. Evaluation of source rocks in the usual sense often includes evaluation of geochemical characteristics and hydrocarbon generation capacity. The factors investigated mainly include organic matter abundance, type, maturity, and parameters such as hydrocarbon generation intensity, amount of hydrocarbon generation, and hydrocarbon expulsion intensity. Relevant experiments are often quantitatively analyzed through a variety of ch...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/32G01N23/046
CPCG01N1/32G01N23/046
Inventor 王晓琦金旭李建明焦航李化冬刘晓丹苏玲
Owner PETROCHINA CO LTD
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