CN112068220B - Comprehensive evaluation method for oil-containing property of shale oil - Google Patents

Comprehensive evaluation method for oil-containing property of shale oil Download PDF

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CN112068220B
CN112068220B CN202010928938.5A CN202010928938A CN112068220B CN 112068220 B CN112068220 B CN 112068220B CN 202010928938 A CN202010928938 A CN 202010928938A CN 112068220 B CN112068220 B CN 112068220B
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孙凤兰
熊正祥
王刚
金娟
马红
焦香婷
赵慧霞
赵天东
王俊
闻竹
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China National Petroleum Corp
CNPC Bohai Drilling Engineering Co Ltd
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Abstract

The invention relates to a comprehensive evaluation method for the oiliness of shale oil, which comprises the following steps: determining parameters reflecting oil abundance and movable hydrocarbon content of the shale oil layer: selecting TG (gamma-gammaFJAs a parameter for reflecting the abundance of the gaseous saturated hydrocarbon, selecting the liquid hydrocarbon amount S measured by constant temperature for 3min from the temperature of 90 ℃ to 300 ℃ in the rock pyrolysis geochemical well logging analysis1Selecting a contrast level N value of quantitative fluorescence analysis as a parameter reflecting the abundance of the aromatic hydrocarbon as a parameter reflecting the abundance of the liquid saturated hydrocarbon; determining a conversion coefficient; determining a weight coefficient: determination of TGFJ、S1Weight coefficient K with N value1、K2(ii) a Determining the comprehensive oil content index LOI of the shale oil logging; and determining the oil layer classification of the shale oil according to the comprehensive oil content index LOI of the shale oil logging. The invention provides a basis for objective and comprehensive evaluation of the oiliness of the shale oil.

Description

Comprehensive evaluation method for oil-containing property of shale oil
Technical Field
The invention belongs to the technical field of shale oil geological exploration, and particularly relates to a comprehensive evaluation method for the oiliness of shale oil.
Background
The shale oil is used as a new exploration field of strategic succeed energy of the country, and the evaluation of the oil content of the shale oil is particularly important due to the characteristics of source-storage integration, high organic carbon content, large fluid differentiation and oil saturation difference, low natural output capacity and the like and the optimization requirement of a horizontal well section cluster. In the exploration and development process of shale oil, a plurality of technologies such as gas logging, rock pyrolysis localization, quantitative fluorescence and the like are applied to logging to evaluate the oil content of the shale oil, but different logging technical data often reflect different hydrocarbon information due to the special storage and oil content characteristics of a shale oil layer, and great troubles are brought to the final objective evaluation of the oil content of the shale oil layer.
Therefore, based on the problems, the method for providing the basis for objective comprehensive evaluation of the oil content of the shale oil is provided, and has important practical significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for providing a basis for objective and comprehensive evaluation of the oil content of shale oil.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a comprehensive evaluation method for the oiliness of shale oil comprises the following steps:
determining parameters reflecting oil abundance and movable hydrocarbon content of the shale oil layer: selecting TG (gamma-gammaFJAs a parameter for reflecting the abundance of the gaseous saturated hydrocarbon, selecting the liquid hydrocarbon amount S measured by constant temperature for 3min from the temperature of 90 ℃ to 300 ℃ in the rock pyrolysis geochemical well logging analysis1Selecting quantitative fluorescence analysis as parameter for reflecting abundance of liquid saturated hydrocarbonThe comparison level N value is used as a parameter for reflecting the abundance of the aromatic hydrocarbon;
determining a conversion coefficient: obtaining a parameter TGFJThe maximum measurement range of the test instrument, the parameter TGFJThe conversion coefficient of (A) is the reciprocal of the highest range; acquiring the highest range of the test instrument of the parameter N, wherein the conversion coefficient of the parameter N is the reciprocal of the highest range; parameter S1The method for obtaining the conversion coefficient is as follows: carrying out saturated sample analysis on a plurality of tested well oil samples in the same layer in the region, and solving the parameter S of a plurality of groups of samples1Average value, using the average value as parameter S1The maximum measurement range of (2), the parameter S1The conversion coefficient of (A) is the reciprocal of the highest range;
determining a weight coefficient: determination of TGFJ、S1Weight coefficient K with N value1、K2；
Determining the comprehensive oil content index LOI of the shale oil logging:
LOI＝(TGFJ×R1+S1×R2)K1+N×R3×K2
TGFJ＝TGpeak value/TGBase value
Wherein R is1As a parameter TGFJConversion coefficient of R2Is a parameter S1Conversion coefficient of R3A conversion coefficient being a parameter N; TG (gamma-ray) in a single phasePeak valueThe highest value in the oil gas display section is shown; TG (gamma-ray) in a single phaseBase valueDisplaying a base value before a section for the drilled oil and gas;
and determining the oil layer classification of the shale oil according to the comprehensive oil content index LOI of the shale oil logging.
Furthermore, when the comprehensive oil content index LOI of the shale oil logging is greater than 0.40, the shale oil belongs to a class I oil layer; when the comprehensive oil content index LOI of the shale oil logging is 0.25-0.40, the shale oil belongs to a II-type oil layer; when the comprehensive oil content index LOI of the shale oil logging is not less than 0.10 and less than 0.25, the shale oil belongs to a III-class oil layer; and when the comprehensive oil content index LOI of the shale oil logging is less than 0.10, the shale oil belongs to a dry layer.
The invention has the advantages and positive effects that:
the method aims to fully utilize logging information such as gas logging, rock pyrolysis localization, quantitative fluorescence and the like, and form an oil-containing comprehensive evaluation index through key parameter optimization and analysis experiments, so that a more sufficient basis is provided for dessert evaluation of a shale oil layer, and a technical support is provided for decision of a shale oil segment cluster optimization scheme.
Detailed Description
First, it should be noted that the specific structures, features, advantages, etc. of the present invention will be specifically described below by way of example, but all the descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implicit in each embodiment or shown or implicit in each embodiment described herein may continue to be combined or subtracted between any of the features (or their equivalents) to achieve still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity, the same or similar features may be identified only in one place in the same drawing.
The comprehensive evaluation method for the oiliness of the shale oil provided by the embodiment comprises the following steps:
determining parameters reflecting oil abundance and movable hydrocarbon content of the shale oil layer: selecting TG (gamma-gammaFJAs a parameter for reflecting the abundance of the gaseous saturated hydrocarbon, selecting the liquid hydrocarbon amount S measured by constant temperature for 3min from the temperature of 90 ℃ to 300 ℃ in the rock pyrolysis geochemical well logging analysis1Selecting a contrast level N value of quantitative fluorescence analysis as a parameter reflecting the abundance of the aromatic hydrocarbon as a parameter reflecting the abundance of the liquid saturated hydrocarbon;
parameters reflecting hydrocarbon information in gas logging mainly comprise TG and C1-C5, wherein the TG reflects the amount of hydrocarbons in the stratum immersed in drilling fluid, and under the condition of the same drilling fluid performance, the higher the TG value is, the higher the hydrocarbon content in the drilling fluid is, and the larger the hydrocarbon energy in the stratum is; using TG under different drilling fluid performance conditionsFJThe hydrocarbon energy in the formation can be more objectively reflectedSize, therefore, TG is preferred in gas loggingFJThe parameter serves as a key parameter reflecting the abundance of the gaseous saturated hydrocarbons.
The raw parameters available for the analysis of the rock pyrolysis geochemical logs included: s0、S1、S2、S4And the like. Wherein S is1For the liquid hydrocarbon amount measured by the procedure from 90 ℃ to 300 ℃ for 3min at constant temperature, the detected hydrocarbon composition has higher liquid saturated hydrocarbon ratio, so S is preferred in the rock pyrolysis chemical logging1The parameter is used as a key parameter for reflecting the abundance of the liquid saturated hydrocarbon.
The contrast level N value of the quantitative fluorescence analysis is a parameter reflecting the oil content in the rock sample, and the principle of the quantitative fluorescence analysis is mainly based on the fluorescence characteristic of aromatic hydrocarbons in petroleum group components, so that the contrast level parameter N is preferably used as a key parameter reflecting the abundance of the aromatic hydrocarbons.
Determining a conversion coefficient: obtaining a parameter TGFJThe maximum measurement range of the test instrument, the parameter TGFJThe conversion coefficient of (A) is the reciprocal of the highest range; acquiring the highest range of the test instrument of the parameter N, wherein the conversion coefficient of the parameter N is the reciprocal of the highest range; parameter S1The method for obtaining the conversion coefficient is as follows: carrying out saturated sample analysis on a plurality of tested well oil samples in the same layer in the region, and solving the parameter S of a plurality of groups of samples1Average value, using the average value as parameter S1The maximum measurement range of (2), the parameter S1The conversion coefficient of (A) is the reciprocal of the highest range;
wherein, the TG test instrument can adopt DML-DATALOG, the highest measuring range is a fixed value of 100, and then the TG is used as the test instrumentFJ1/100; the testing instrument of N can adopt LH-SDYG, the highest measuring range is fixed value 15, then the conversion coefficient of N is 1/15;
determining a weight coefficient: determination of TGFJ、S1Has a weight coefficient of K1Determining the weight coefficient of N as K2(ii) a The content parameters of saturated hydrocarbon, aromatic hydrocarbon, non-hydrocarbon and asphaltene can be obtained by analyzing the components of crude oil families, and the content of the saturated hydrocarbon and the aromatic hydrocarbon in the crude oil is relatively stable in the shale oil bed series in a specific area, so that the content of the saturated hydrocarbon and the content of the aromatic hydrocarbon in the crude oil are relatively stableThe proportions of aromatics in the constituent components, K1 and K2, respectively, are also relatively stable, from which the weight coefficients of TGFJ, S1 and the N value are determined to be K1 and K2, respectively.
Determining the comprehensive oil content index LOI of the shale oil logging:
LOI＝(TGFJ×R1+S1×R2)K1+N×R3×K2
TGFJ＝TGpeak value/TGBase value
Wherein R is1As a parameter TGFJConversion coefficient of R2Is a parameter S1Conversion coefficient of R3Conversion factor, TG, for parameter NPeak valueThe highest value in the oil gas display section is shown; TG (gamma-ray) in a single phaseBase valueDisplaying a base value before a section for the drilled oil and gas;
and determining the oil layer classification of the shale oil according to the comprehensive oil content index LOI of the shale oil logging.
When the comprehensive oil content index LOI of the shale oil logging is greater than 0.40, the shale oil belongs to a class I oil layer; when the comprehensive oil content index LOI of the shale oil logging is 0.25-0.40, the shale oil belongs to a II-type oil layer; when the comprehensive oil content index LOI of the shale oil logging is not less than 0.10 and less than 0.25, the shale oil belongs to a III-class oil layer; and when the comprehensive oil content index LOI of the shale oil logging is less than 0.10, the shale oil belongs to a dry layer.
For example, in this embodiment, the comprehensive oil content index calculation is performed on different well sections of the multi-well, and it should be noted that, in order to increase the accuracy of the comprehensive oil content index, multiple comprehensive oil content indexes can be obtained by sampling at intervals, and the average value of the multiple comprehensive oil content indexes is obtained, specifically, one sample can be obtained every 1 meter along the depth of the well, and the parameter TG is obtained by the instrument respectivelyFJ、S1And N value, and finally obtaining a plurality of comprehensive oil content indexes, thereby obtaining an average value of the plurality of comprehensive oil content indexes, and verifying the comprehensive oil content indexes through the oil production obtained by oil testing, specifically, as shown in the following table 1:
TABLE 1 shale oil well test oil and comprehensive oil content index contrast table
Number of well Horizon Well section Comprehensive oil content index Daily oil (t)
G108-8 Hole two 1 2896.0-2966.0 0.18 1.25
G108-8 Hole two 3 3196-3236 0.36 5.21
GD13 Hole two 1 4062-4092 0.51 10.5
GD13 Hole two 2 4138-4176 0.35 4.56
G1608 Hole two 1+2 4050-4137 0.52 47
GY2-1-1 Hole two 1 3880-4484 0.48 11.48
As can be seen from Table 1, the test oil yield effect is good when the interval with high comprehensive oil content index is synthesized, the test oil yield effect is poor when the interval with low comprehensive oil content index is synthesized, and the shale oil can be effectively evaluated by applying the comprehensive oil content index.
The method provided by the invention is used for testing historical well data and testing new drilling wells on site, the consistency of parameter characteristics and oil testing results is strong, the oil content of shale oil can be well characterized, and an important basis is provided for comprehensive interpretation and evaluation of logging in shale oil segment cluster optimization.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (2)

1. A comprehensive evaluation method for the oiliness of shale oil is characterized by comprising the following steps: the method comprises the following steps:
determining parameters reflecting oil abundance and movable hydrocarbon content of the shale oil layer: selecting TG (gamma-gammaFJSelecting the parameter which is used for reflecting the abundance of the gaseous saturated hydrocarbon and is increased from 90 ℃ to 3 ℃ in the rock pyrolysis geochemical logging analysisThe liquid hydrocarbon amount S is measured at a constant temperature of 00 ℃ for 3min1Selecting a contrast level N value of quantitative fluorescence analysis as a parameter reflecting the abundance of the aromatic hydrocarbon as a parameter reflecting the abundance of the liquid saturated hydrocarbon;
determining a conversion coefficient: obtaining a parameter TGFJThe maximum measurement range of the test instrument, the parameter TGFJThe conversion coefficient of (A) is the reciprocal of the highest range; acquiring the highest range of the test instrument of the parameter N, wherein the conversion coefficient of the parameter N is the reciprocal of the highest range; parameter S1The method for obtaining the conversion coefficient is as follows: carrying out saturated sample analysis on a plurality of tested well oil samples in the same layer in the region, and solving the parameter S of a plurality of groups of samples1Average value, using the average value as parameter S1The maximum measurement range of (2), the parameter S1The conversion coefficient of (A) is the reciprocal of the highest range;
determining a weight coefficient: determination of TGFJ、S1Weight coefficient K with N value1、K2；
Determining the comprehensive oil content index LOI of the shale oil logging:
LOI＝(TGFJ×R1+S1×R2)K1+N×R3×K2
TGFJ＝TGpeak value/TGBase value
Wherein R is1As a parameter TGFJConversion coefficient of R2Is a parameter S1Conversion coefficient of R3A conversion coefficient being a parameter N; TG (gamma-ray) in a single phasePeak valueThe highest value in the oil gas display section is shown; TG (gamma-ray) in a single phaseBase valueDisplaying a base value before a section for the drilled oil and gas;
and determining the oil layer classification of the shale oil according to the comprehensive oil content index LOI of the shale oil logging.
2. The comprehensive evaluation method for the oiliness of shale oil according to claim 1, characterized in that: when the comprehensive oil content index LOI of the shale oil logging is greater than 0.40, the shale oil belongs to a class I oil layer; when the comprehensive oil content index LOI of the shale oil logging is 0.25-0.40, the shale oil belongs to a II-type oil layer; when the comprehensive oil content index LOI of the shale oil logging is not less than 0.10 and less than 0.25, the shale oil belongs to a III-class oil layer; and when the comprehensive oil content index LOI of the shale oil logging is less than 0.10, the shale oil belongs to a dry layer.
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