CN109444983B - Quantitative evaluation method for type division of oil and gas transmission and conduction system - Google Patents
Quantitative evaluation method for type division of oil and gas transmission and conduction system Download PDFInfo
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Abstract
The invention discloses a quantitative evaluation method for type division of an oil and gas transmission and conduction system, which comprises the following steps of firstly, carrying out fine comparison on oil and gas sources; determining the oil-gas migration distance; and finally, dividing the type of the oil and gas transmission and conduction system. The method has the advantages that the source of the oil-gas reservoir is determined through fine comparison of the oil-gas source, the oil-gas migration distance is further determined according to earthquake, oil reservoir and other data, and a quantitative evaluation model for type division of an oil-gas transmission and conduction system is established. The method can meet the requirement of quantitative evaluation of the type of the oil and gas transportation and conduction system, has good application effect in a research area, is easy to operate, can be popularized and applied to other oil and gas exploration areas, and particularly can provide a basis for oil and gas reservoir formation simulation, favorable exploration direction, zone prediction and the like.
Description
Technical Field
The invention belongs to the technical field of oil and gas resource geological exploration, development and evaluation, and relates to a quantitative evaluation method for type division of an oil and gas transmission and conduction system.
Background
The oil gas transmission and conduction system refers to various transmission and conduction bodies which bear oil gas migration in the oil gas-containing system and the combination of the transmission and conduction bodies and the oil gas migration. As a bridge for connecting the source rock and the trap, a transportation system is the core of oil and gas migration and becomes important content of oil and gas reservoir research. For the type division of an oil and gas transmission and conduction system, various division schemes exist: if the oil and gas migration main channel is adopted, the transportation and conduction system is divided into 4 types of sand bodies, fractures, unconformities and compounds; according to the functions of different types of oil and gas migration channels in migration, the oil and gas migration channels can be divided into 4 types which are mainly fracture zones, related to ancient structural ridges, related to movable hot fluid diapir and related to non-integration; the utility model is divided into 4 types of a net blanket type, a T type, a step type and a crack type according to the combination mode of the transmission and conduction system elements. At present, a plurality of methods are researched for oil and gas transmission and conduction systems, such as transmission and conductionThe system itself studies, discusses the composition, space-time configuration, transportation capability, validity period and oil-gas migration period configuration; and geochemical characterization of the fluid in the transmission conductor system, e.g. saturated hydrocarbon chromatography-mass spectrometry, relative content of high molecular weight n-alkanes, aromatic compounds, C29Sterane 20S/(20S +20R) and C29However, no matter what type of the transportation and conduction system, the research method emphasizes that the transportation and conduction system is analyzed aiming at the oil and gas migration process from the perspective of geochemical characteristics, and as the acquisition of geochemical parameters on an oil and gas migration path needs a large amount of analysis and test data, the research precision is difficult to guarantee under the condition of few sample test points, so that the reliability and the accuracy of oil and gas resource evaluation, favorable exploration zone prediction and the like are caused.
Disclosure of Invention
The invention aims to provide a quantitative evaluation method for type division of an oil and gas transmission and conduction system. The method can meet the requirement of quantitative evaluation of the type of the oil and gas transportation and conduction system, has good application effect in a research area, is easy to operate, can be popularized and applied to other oil and gas exploration areas, and particularly can provide a basis for oil and gas reservoir formation simulation, favorable exploration direction, zone prediction and the like.
The technical scheme adopted by the invention is carried out according to the following steps:
(1) fine comparison of oil and gas sources;
(2) determining the oil-gas migration distance;
(3) and dividing the type of the oil and gas transmission and conduction system.
Further, the fine oil-gas source comparison method in the step (1) is to collect samples of the hydrocarbon source rocks in the research area and the found oil-gas reservoir, analyze geochemical characteristics of the hydrocarbon source rocks and crude oil, such as biomarker compounds, carbon isotopes and the like, determine the oil-gas source through oil-rock fine comparison, and divide an oil-gas-containing system.
Further, the determination of the oil-gas migration distance in the step (2) refers to the distance from the oil-gas hydrocarbon generation center to the oil-gas reservoir trap in the same oil-gas system, and comprises a horizontal distance and a vertical distance, wherein the horizontal distance is obtained according to an oil-gas exploration result diagram, and the vertical distance is obtained according to a seismic profile diagram and an oil reservoir profile diagram.
Further, the type division of the oil and gas transmission and conduction system in the step (3) is to count the distances between the hydrocarbon source rocks and all oil and gas reservoirs in the same oil and gas system, determine the distance between the hydrocarbon source rocks and the oil and gas reservoir with the farthest distance, and establish a quantitative evaluation mathematical model of the type division of the oil and gas transmission and conduction system according to the oil and gas migration transverse-longitudinal distance ratio as follows:
T＝H1/H2(1)
in the formula, T is the type division coefficient of an oil and gas transmission and conduction system, H1The horizontal distance between a hydrocarbon source rock and a hydrocarbon reservoir farthest away in the same oil-gas-containing system is m, H2Is the vertical distance between the source rock and the farthest hydrocarbon reservoir in the same hydrocarbon-bearing system, and is expressed in m.
Drawings
FIG. 1 is a block diagram of the method steps of the present invention;
FIG. 2 is a graph comparing geochemical characteristics of source rock and crude oil;
FIG. 3 is a hydrocarbon migration distance pattern diagram.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
Taking the depression of the yang-saving of the Bohai Bay basin as an example, as shown in FIG. 1, the specific method is as follows:
(1) fine comparison of oil and gas sources
The method comprises the steps of collecting samples of hydrocarbon source rocks and found oil and gas reservoirs in a research area (the samples of an oil and gas migration starting point and an oil and gas migration finishing point are easy to obtain), analyzing geochemical characteristics of the hydrocarbon source rocks and crude oil, such as biomarker compounds, carbon isotopes and the like, determining the oil and gas sources through oil-rock fine comparison (figure 2), and dividing an oil and gas system.
(2) Oil and gas migration distance determination
The oil and gas migration distance refers to the distance from the hydrocarbon generation center to the trap of the oil and gas reservoir in the same oil and gas system, and comprises a horizontal distance and a vertical distance (figure 3). The horizontal distance can be obtained according to an oil and gas exploration result diagram, and the vertical distance can be obtained according to a seismic profile, an oil reservoir profile and the like.
(3) Oil and gas transportation and conduction system type division
Counting the distances between the source rocks and all oil and gas reservoirs in the same oil and gas-containing system, determining the distance between the source rocks and the oil and gas reservoir with the farthest distance, and establishing a quantitative evaluation mathematical model divided by the following oil and gas transportation system types according to the oil and gas migration transverse-longitudinal distance ratio:
T＝H1/H２(1)
in the formula, T is the type division coefficient of an oil and gas transmission and conduction system, H1The horizontal distance between a hydrocarbon source rock and a hydrocarbon reservoir farthest away in the same oil-gas-containing system is m, H2Is the vertical distance between the source rock and the farthest hydrocarbon reservoir in the same hydrocarbon-bearing system, and is expressed in m. In the example, when T is less than 30, the type of the oil and gas transportation and conduction system is vertical, and the vertical transportation and conduction of the fault is mainly used; when T is more than 30, the type of the oil and gas transmission and conduction system is a lateral type, and the lateral transmission and conduction of sand bodies (unconformity) is mainly used.
The method is used for dividing the types of the oil and gas transmission and conduction system in the research area (table 1 oil and gas transmission and conduction system type division coefficient statistical table). The evaluation result shows that the oil and gas migration in the areas of the forest fan house, the single house temple and the like is mainly conducted by the sand body lateral transportation, and the oil and gas migration in the areas of the Sanhe village, the wild goose beach and the like is mainly conducted by the fault vertical transportation. The evaluation result is consistent with the result of the oil and gas transmission and conduction system determined by the geochemical indexes, which shows that the method can be used for quantitative evaluation and prediction of the type of the oil and gas transmission and conduction system.
TABLE 1
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the present invention.
Claims (2)
1. A quantitative evaluation method for type division of an oil and gas transmission and conduction system is characterized by comprising the following steps:
(1) fine comparison of oil and gas sources;
(2) determining the oil-gas migration distance;
(3) dividing the type of an oil and gas transmission and conduction system;
the determination of the oil-gas migration distance in the step (2) refers to the distance from an oil-gas hydrocarbon generation center to an oil-gas reservoir trap in the same oil-gas system, and comprises a horizontal distance and a vertical distance, wherein the horizontal distance is obtained according to an oil-gas exploration result diagram, and the vertical distance is obtained according to a seismic profile diagram and an oil reservoir profile diagram;
the type division of the oil and gas transmission and conduction system in the step (3) is to count the distances between the hydrocarbon source rocks and all oil and gas reservoirs in the same oil and gas system, determine the distance between the hydrocarbon source rocks and the oil and gas reservoir with the farthest distance, and establish a quantitative evaluation mathematical model of the type division of the oil and gas transmission and conduction system according to the oil and gas migration transverse-longitudinal distance ratio as follows:
T＝H1/H2(1)
in the formula, T is the type division coefficient of an oil and gas transmission and conduction system, H1The horizontal distance between a hydrocarbon source rock and a hydrocarbon reservoir farthest away in the same oil-gas-containing system is m, H2Is the vertical distance between the source rock and the farthest hydrocarbon reservoir in the same hydrocarbon-bearing system, and is expressed in m.
2. The quantitative evaluation method for type division of an oil and gas transmission and conduction system according to claim 1, characterized in that: the method for finely comparing the oil gas sources in the step (1) comprises the steps of collecting samples of hydrocarbon source rocks in a research area and found oil gas reservoirs, analyzing geochemical characteristics of biomarker compounds and carbon isotopes of the hydrocarbon source rocks and crude oil, determining the oil gas sources through oil-rock fine comparison, and dividing an oil-gas-containing system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108052728A (en) * | 2017-12-08 | 2018-05-18 | 中国石油化工股份有限公司 | The characterizing method of lithological pool subtle passage system |
| CN108229089A (en) * | 2017-12-25 | 2018-06-29 | 中国石油大学(华东) | A kind of quantitative evaluation method of clastic rock unconformity transporting capability |
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| CN108052728A (en) * | 2017-12-08 | 2018-05-18 | 中国石油化工股份有限公司 | The characterizing method of lithological pool subtle passage system |
| CN108229089A (en) * | 2017-12-25 | 2018-06-29 | 中国石油大学(华东) | A kind of quantitative evaluation method of clastic rock unconformity transporting capability |
Non-Patent Citations (3)
| Title |
|---|
| A novel molecular index for secondary oil migration distance;Liuping Zhang et al.;《SCIENTIFIC REPORTS》;20130822;第1-7页 * |
| Hydrocarbon migration system of Fulaerji oil field, Songliao Basin, NE China;XIN Renchen et al.;《PETROLEUM EXPLORATION AND DEVELOPMENT》;20141031;第41卷(第5期);第607-615页 * |
| 江陵凹陷它源油藏成藏模式及特征;袁娟梅;《石油地质与工程》;20150131;第29卷(第1期);第27页 * |
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