影响油包裹体均一温度的主要控制因素及其地质涵义

平宏伟; 陈红汉

doi:10.3799/dqkx.2011.014

影响油包裹体均一温度的主要控制因素及其地质涵义

doi: 10.3799/dqkx.2011.014

平宏伟^1,,
陈红汉^{1, 2}

1.
中国地质大学构造与油气资源教育部重点实验室, 湖北武汉 430074
2.
中国科学院地质与地球物理研究所, 北京 100029

基金项目:

国家自然科学基金项目 40372068

详细信息

作者简介:
平宏伟(1982-), 男, 在读博士, 主要从事含烃流体地质研究.E-mail: howping@yahoo.cn

中图分类号: P618
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出版历程
- 收稿日期: 2010-06-09
- 刊出日期: 2011-01-01

Main Controlling Factors on Oil Inclusion Homogenization Temperatures and Their Geological Significance

PING Hong-wei^1
,,
CHEN Hong-han^{1, 2}

1.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

摘要

摘要: 成岩矿物中捕获的油包裹体已经广泛应用到油气成藏过程约束研究之中, 但对油包裹体均一温度的影响因素及其地质涵义还了解得不够清楚.主要运用热动力学模拟的方法, 通过模拟黑油和挥发性油两种不同原油类型在不同温-压条件下捕获时油包裹体均一温度与捕获时温度之间的关系, 发现油包裹体的均一温度受到油组分、捕获温度和压力等多种因素影响; 利用同期盐水包裹体约束的温-压条件并结合单包裹体组分分析结果, 反过来可以给出油包裹体均一温度以及与同期盐水包裹体均一温度差值地质解释, 从而为获得较为准确的油气充注幕次划分和古流体压力热动力学模拟结果奠定基础.
- 油包裹体 /
- 均一温度 /
- PVT组分 /
- 石油地质
Abstract: Petroleum inclusions trapped in diagenetic minerals have been extensively applied to studies of constraint hydrocarbon migration and accumulation, but the effects on petroleum inclusion homogenization temperatures and their geological implications have not been completely understood. In this paper, a thermodynamic modeling method was employed, and two types of black oil and volatile oil were used to simulate their homogenization temperatures and to establish the homogenization temperature relationship between petroleum inclusions and their coeval aqueous inclusions under different P-T conditions. It is concluded that all the petroleum composition, trapped temperature and pressure have influence on the petroleum inclusion homogenization temperature. In contrast, if the trapped P-T and petroleum composition of single inclusion are known, the petroleum inclusion homogenization temperature and the difference between petroleum inclusions and their coeval aqueous inclusions can give geological meanings, which can play a great role on hydrocarbon charging episodes and paleofluid pressure modeling.
- petroleum inclusion /
- homogenization temperature /
- PVT composition /
- petroleum geology

HTML全文

图 1 捕获的油包裹体示意性P-T相图

T_hoil为油包裹体均一温度；T_haqu为同期盐水包裹体均一温度

Fig. 1. The schematic P-T phase diagram of trapped oil inclusion

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图 2 油包裹体捕获温度与模拟的均一温度和△T_h关系

Fig. 2. Plots of trapped temperatures of oil inclusions vs. their simulated homogenization temperatures and △T_h

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图 3 不同压力-温度-组分条件下油包裹体捕获过程

Fig. 3. Loci of oil inclusions trapped in the different P-T-x space

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图 4 沿着A点到F点轨迹油包裹体的捕获温度与其均一温度和△T_h关系

Fig. 4. Trapped temperatures of oil inclusions vs. their homogenization temperatures and △T_h from A to F loci shown in Fig. 3

下载: 全尺寸图片幻灯片

表 1 不同类型北美原油的组分数据及参数

Table 1. The composition distribution and parameters of different North American oils

组分	黑油	挥发油	临界压力(MPa)	临界温度(K)	偏心因子(ω)	组分摩尔质量(g/mol)
组分	摩尔分数(mol)		临界压力(MPa)	临界温度(K)	偏心因子(ω)	组分摩尔质量(g/mol)
N₂	-	0.42	3.35	126.20	0.040	28.02
CO₂	0.84	0.28	7.28	304.20	0.225	44.10
C₁	26.57	62.06	4.54	190.60	0.008	16.04
C₂	10.74	9.50	4.82	305.40	0.098	30.07
C₃	9.27	6.19	4.19	369.80	0.152	44.09
i-C₄	0.52	1.28	3.60	408.10	0.176	58.12
n-C₄	6.30	2.54	3.75	425.20	0.193	58.12
i-C₅	1.26	0.98	3.34	460.40	0.227	72.15
n-C₅	3.92	1.39	3.33	469.60	0.251	72.15
C₆	1.76	2.26	2.93	507.40	0.296	86.17
C₇₊	38.82	-	1.539	699.43	0.670	207.00
C₇₊	-	13.6	1.754	669.01	0.602	180.00
注：据Aplin et al., 1999；i.代表异构烃；n.代表正构烷烃；C₇₊代表碳数大于等于7的烃类，C₇₊的临界温度和临界压力根据Riazi and Daubert(1987)，偏心因子根据Edmister and Lee(1986).

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