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Method suitable for evaluating seriously-strongly biodegradable crude oil

A technology for biodegradation and crude oil evaluation, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of low dependence and inaccurate judgment

Inactive Publication Date: 2020-04-28
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Since the determination of the degree of crude oil biodegradation is one of the foundations of oil and gas exploration, in addition to the research on the mechanism of crude oil biodegradation, those skilled in the art are paying more and more attention to the degree of crude oil biodegradation. The methods of crude oil biodegradation degree basically rely on the personal experience of different professional technicians to judge. Due to the complexity and variability of crude oil biodegradation degree, the determination of crude oil biodegradation degree through empirical judgment often leads to inaccurate judgment. Therefore, it is urgent A method for determining the degree of severe-extensive biodegradation of crude oils that is less dependent on personal experience needs to be developed

Method used

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  • Method suitable for evaluating seriously-strongly biodegradable crude oil
  • Method suitable for evaluating seriously-strongly biodegradable crude oil
  • Method suitable for evaluating seriously-strongly biodegradable crude oil

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Experimental program
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Effect test

Embodiment 1

[0163] Taking the Chepaizi uplift in the western uplift of the Junggar Basin as an example, according to the steps of the present invention, the carboniferous-Shawan Formation main oil-bearing formations in this area are quantitatively divided into biodegradation degrees, and the specific implementation steps are as follows:

[0164] 1. according to the chromatographic-mass spectrometry (GC-MS-SIM) analysis that the oil test data of the research area is done, select 38 wells that cover the scope of the whole area, count and calculate the geochemical parameters given by step one of the present invention (as shown in the table 2); before this work, oil source correlation work has been carried out, and the influence of geological factors such as parent material input and maturity has been excluded).

[0165] 2. The Euclidean distance method between groups is mainly used to cluster the samples, and the following results are obtained ( image 3 ):

[0166] ①When D=23.0, it can be di...

Embodiment 2

[0174] Taking the Halahatang sag in the Tabei uplift of the Tarim Basin as an example, according to the steps of the present invention, the crude oil of the Ordovician Yingshan Formation-Jianfang Formation in this area is quantitatively divided into biodegradation degrees, and the specific implementation steps are as follows:

[0175] 1. Based on the oil testing data in the study area and the chromatographic-mass spectrometry (GC-MS-SIM) and comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GC×GC-TOFMS) analysis ( Figure 7-Figure 10 ), select 19 wells covering the whole area, count and calculate the geochemical parameters (table 2) given by step one of the present invention; before this work, the oil source comparison work has been carried out, and parent material input and maturity have been excluded and other geological factors.

[0176] 2. In this example, the group connection Euclidean distance method is mainly used to cluster the samples,...

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Abstract

The invention discloses a method suitable for evaluating seriously-strongly biodegradable crude oil. The method comprises the following steps: selecting eight parameters as input indexes of hierarchical clustering analysis; classifying crude oil samples according to degradation characteristics; selecting eight compounds which have different sensitivities to microbial degradation and are in an incremental relationship; dividing selected parameter vectors into five grades; calculating and summarizing the MN2 values; judging the degradation degree of the crude oil to obtain a quantitative degradation degree plane distribution diagram in a research area; and selecting degradation parameters C2925-NH / C30H, C2217-NT / C23TT, C27-29DS / C27-29RS and G / (C2925-NH + C30H), and verifying a result by utilizing an expert scoring method. According to the method, effective parameters are selected to quantitatively evaluate the biodegradation level of the crude oil on the basis of fully considering the quasi-stepped change of the biomarker compound in the full degradation interval. The method has the advantages of low dependence on personal experience, checkability, and accurate determination of the crude oil biodegradation degree, and reduces the misjudgment of traditional crude oil degradation grading division.

Description

technical field [0001] The invention relates to the technical field of petroleum sample analysis, in particular to a method suitable for evaluation of severe-strongly biodegraded crude oil. Background technique [0002] my country's onshore heavy oil resources account for more than 20% of the total oil resources, and the proven and controlled reserves are about 4 billion tons. More than 70 heavy oil fields have been discovered in 12 basins. Domestic heavy oil production accounts for about 10% of the total crude oil production every year, and China's unused super heavy oil proven geological reserves are 7.01×10 8 t. Heavy oil is divided into primary heavy oil and secondary heavy oil. Among them, oxidative degradation heavy oil and anaerobic degradation heavy oil involved in microbial degradation are the most important heavy oil, accounting for more than 90% of heavy oil reserves. According to Hunt's statistics, about 1 / 5 of the crude oil in the world is destroyed by bacteri...

Claims

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Application Information

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IPC IPC(8): G01N30/88G01N30/06G01N30/86
CPCG01N30/88G01N30/06G01N30/8675
Inventor 常象春史兵兵徐佑德刘烨
Owner SHANDONG UNIV OF SCI & TECH
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