低温相变过程对石英矿物中盐水包裹体再平衡作用的影响

刘可禹; 张书林; 杨鹏

doi:10.11781/sysydz202305882

低温相变过程对石英矿物中盐水包裹体再平衡作用的影响

doi: 10.11781/sysydz202305882

刘可禹^{1, 2, 3,},
张书林¹,
杨鹏^{1, 2}

1.
中国石油大学(华东) 地球科学与技术学院, 山东青岛 266580
2.
深层油气全国重点实验室中国石油大学(华东), 山东青岛 266580
3.
崂山实验室, 山东青岛 266071

基金项目:

国家自然科学基金委油气成藏机理创新研究群体 41821002

特提斯地球动力系统重大研究计划 92055204

详细信息

作者简介:
刘可禹(1963-), 男, 教授, 本刊编委, 从事盆地模拟与油气成藏研究。E-mail: liukeyu@upc.edu.cn

中图分类号: TE135
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出版历程
- 收稿日期: 2023-07-06
- 修回日期: 2023-09-12
- 刊出日期: 2023-09-28

Effect of low-temperature phase change on the re-equilibration of brine inclusions hosted in quartz minerals

LIU Keyu^{1, 2, 3
,},
ZHANG Shulin¹,
YANG Peng^{1, 2}

1.
School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China
2.
National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, Shandong 266580, China
3.
The Laoshan Laboratory, Qingdao, Shandong 266071, China

摘要

摘要: 流体包裹体显微测温分析应当遵循先开展均一温度测定、后进行冰点测定的分析流程，但在实际操作过程中该测试流程并未严格执行，不少研究者在测完冰点温度(T_m)后继续重复测试该样品的均一温度(T_h)，从而导致测试结果可能存在诸多不确定性。为了揭示低温相变过程对盐水包裹体再平衡作用的影响，引起广大研究人员对流体包裹体显微测温流程的重视，在盐水包裹体岩相学观察以及显微激光拉曼分析的基础上，开展流体包裹体显微测温分析，结合流体包裹体PVTx数值模拟以及前人研究结果，定量对比不同测温顺序得到的显微测温数据的差异。结果表明：冰点测试之前，盐水包裹体均一温度可以被多次重复测试；在低温相变测温过程中盐水包裹体可能会发生拉伸甚至泄露，其均一温度值会有一定程度的上升，但其冰点温度值基本不变，因此低温相变测温可能会造成其记录的原始信息发生重置；相较于方解石矿物，石英内部的盐水包裹体具有更强的抵抗再平衡作用影响的能力；较高的气体充填度以及高盐度可以在一定程度上减缓再平衡作用对盐水包裹体的影响；在低温相变测温过程中，由于水结冰产生的体积膨胀作用，盐水包裹体发生拉伸甚至泄露等再平衡现象普遍存在，导致盐水包裹体的均一温度值普遍升高。
- 盐水包裹体 /
- 显微测温分析 /
- 再平衡作用 /
- PVTx模拟 /
- 气体充填度 /
- 盐度
Abstract: Microthermometric measurement of fluid inclusions should follow the sequence of measuring homogenization temperature (T_h) first, followed by the measurement of final freezing point temperature (T_m). However, in practice, this measurement sequence has not always been strictly followed. Many researchers may repeatedly measure the homogenization temperature of fluid inclusions even after the measurement of the final freezing point temperature. This may result in erroneous microthermometric data being obtained. In order to highlight this issue and to emphasize the importance of following the correct microthermometric measurement sequence, this study carried out repeated microthermometric measurements of brine inclusions and quantitatively compared the differences in the microthermomitric data obtained from different microthermomitric measurement sequences. The measurement exercise was aided by petrographic observation of brine inclusions and microscopic laser Raman analysis and fluid inclusion PVTx modelling. The results indicate that prior to the measurement of the final freezing point temperature, the homogenization temperature of brine inclusions can be repeatedly measured with the T_h data showing no obvious deviation. During the measurement of the final freezing point temperature, the brine inclusion may undergo stretching or even leakage, and any subsequent T_h measurements may yield elevated values, but T_m value remains largely unchanged. Therefore, low-temperature (freezing) phase-change measurement may cause resetting of the original PVTx information recorded. Compared to calcite minerals, brine inclusions hosted in quartz have stronger resistance to the influence of re-equilibration, and higher vapor filling degree and high salinity can offset the influence of brine inclusion re-equilibration to a certain extent. In the process of low-temperature phase change temperature measurement, due to the inflation caused by water freezing, it is common for brine inclusions to undergo stretching or even leakage, leading to a general increase in the homogenization temperature of brine inclusions.
- brine inclusion /
- microthermometric analysis /
- re-equilibration /
- PVTx modeling /
- vapor filling degree /
- salinity
注释:

1) 所有作者声明不存在利益冲突。

1) 利益冲突声明/Conflict of Interests

2) 刘可禹和杨鹏参与实验设计；张书林完成实验操作；所有作者均参与论文的写作和修改；所有作者均阅读并同意最终稿件的提交。

2) 作者贡献/Authors’ Contributions

HTML全文

图 1 流体包裹体显微测温流程

Figure 1. Measurement sequence for fluid inclusion microthermometric analysis

下载: 全尺寸图片幻灯片

图 2 石英矿物中盐水包裹体显微照片及其显微激光拉曼光谱

Figure 2. Microphotographs and Raman spectra of brine inclusions within quartz minerals

下载: 全尺寸图片幻灯片

图 3 流体包裹体显微测温实验T_h0与T_h-AM交会图

Figure 3. Cross plots of T_h0 and T_h-AM values of fluid inclusion microthermometric measurement

下载: 全尺寸图片幻灯片

图 4 低温相变测温前后盐水包裹体均一温度变化

Figure 4. Barcharts of T_h values before and after low-temperature phase-change measurement, respectively

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图 5 低温相变测温前后盐水包裹体冰点温度变化

Figure 5. Barcharts of T_m values before and after low-temperature phase-change measurement, respectively

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图 6 流体包裹体显微测温实验T_h0与ΔT_h交会图

Figure 6. Cross plots of T_h0 and ΔT_h values of fluid inclusion microthermometric measurement

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图 7 流体包裹体显微测温实验T_m0与ΔT_h交会图

Figure 7. Cross plots of T_m0 and ΔT_h values of fluid inclusion microthermometric measurement

下载: 全尺寸图片幻灯片

图 8 两种不同组分盐水包裹体的P-T相图

Figure 8. P-T projection of two brine inclusions having different salinity values

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表 1 流体包裹体显微测温实验数据

Table 1. Summary of fluid inclusion microthermometric measurement results

井名	深度/m	FIA	T_h0/℃	T_h2/℃	T_h3/℃	T_h-AM/℃	T_m0/℃	T_h^*/℃	ΔT_h/℃	T_m^*/℃
Y33-1	3 771.0	Ⅰ	152.8	152.3	152.6	152.6	-3.5	158.0	5.2	-3.5
			153.6	153.3	153.8	153.6	-3.5	159.0	5.4	-3.5
			153.8	154.2	154.0	154.0	-3.5	159.8	6.0	-3.5
			154.2	154.2	154.5	154.3	-3.5	160.2	6.0	-3.5
			154.7	154.5	154.8	154.7	-3.5	161.7	7.0	-3.5
			155.5	155.2	155.4	155.4	-3.5	160.5	5.0	-3.5
			156.2	156.1	156.3	156.2	-3.5	161.6	5.4	-3.5
			157.3	157.3	157.3	157.3	-3.6	162.1	4.8	-3.6
			157.8	162.6	163.5	161.3	-3.6	162.2	4.4	-3.6
			157.8	158.0	157.8	157.9	-3.6	162.9	5.1	-3.6
			158.4	158.4	158.6	158.5	-3.6	163.6	5.2	-3.6
			158.5	158.8	158.5	158.6	-3.6	163.8	5.3	-3.6
			158.8	159.0	159.0	158.9	-3.6	164.4	5.6	-3.6
			159.1	158.9	159.4	159.1	-3.6	164.7	5.6	-3.6
			159.4	159.6	159.5	159.5	-3.6	165.5	6.1	-3.6
			159.9	159.7	159.9	159.8	-3.7	166.2	6.3	-3.7
			161.7	161.8	162.0	161.8	-3.7	167.8	6.1	-3.7
			162.9	162.8	163.2	163.0	-3.7	166.3	3.4	-3.7
			164.5	164.5	164.7	164.6	-3.8	168.4	3.9	-3.8
			165.6	165.5	165.8	165.6	-3.8	170.5	4.9	-3.8
	4 347.0	Ⅰ	176.8	176.6	176.8	176.7	-5.8	182.3	5.5	-5.8
			182.2	182.0	182.0	182.1	-5.9	185.5	3.3	-5.9
			183.5	183.6	183.5	183.5	-6.0	186.7	3.2	-5.9
			185.5	185.3	185.6	185.5	-6.0	188.7	3.2	-6.0
			186.8	187.0	187.1	187.0	-6.0	189.0	2.2	-6.0
			187.8	187.8	187.8	187.8	-6.0	191.7	3.9	-6.0
			188.1	188.3	188.0	188.1	-6.0	192.2	4.1	-6.0
			189.6	189.5	189.8	189.6	-6.0	193.8	4.2	-6.0
Y36-2	3 771.0	Ⅰ⁺	141.1	141.1	141.2	141.1	-5.3	141.8	0.7	-5.3
			143.8	143.6	143.9	143.8	-5.3	144.5	0.7	-5.3
			147.3	147.2	147.5	147.3	-5.3	148.0	0.7	-5.4
			150.8	150.9	150.8	150.8	-5.4	151.5	0.7	-5.4
			152.3	152.3	152.4	152.3	-5.4	152.8	0.5	-5.4
		Ⅱ^#	271.8	271.5	272.0	271.8	-1.3	272.1	0.3	-1.3
			273.6	273.9	273.9	273.8	-1.3	274.2	0.6	-1.3
			276.7	282.2	280.9	279.9	-1.3	277.3	0.6	-1.3
			288.5	288.5	288.9	288.6	-1.3	289.2	0.7	-1.3
			293.7	293.2	294.3	293.7	-1.3	294.0	0.3	-1.3
	4 051.0	Ⅰ⁺	154.6	154.5	154.8	154.6	-8.3	155.1	0.5	-8.3
			156.6	156.5	156.8	156.6	-8.3	156.9	0.3	-8.3
			157.8	157.8	157.8	157.8	-8.3	158.2	0.4	-8.3
			158.0	158.0	158.2	158.1	-8.3	158.7	0.7	-8.3
			159.5	159.3	159.4	159.4	-8.3	159.9	0.4	-8.3
			160.6	160.7	160.9	160.7	-8.3	161.0	0.4	-8.3
H34-6	3 833.0	Ⅰ	127.2	127.0	127.3	127.2	-1.3	137.8	10.6	-0.7
			128.7	128.8	128.9	128.8	-1.3	138.2	9.5	-0.7
			129.8	129.6	129.9	129.8	-1.3	139.9	10.1	-0.8
			133.5	139.0	139.9	137.5	-1.4	140.6	7.1	-0.8
	3 903.0	Ⅰ	135.2	135.0	135.3	135.2	-2.9	141.5	6.3	-3.2
			135.5	135.4	135.7	135.5	-3.0	141.8	6.3	-3.3
			136.3	136.1	136.2	136.2	-3.0	142.3	6.0	-3.3
			136.6	136.5	136.8	136.6	-3.0	142.9	6.3	-3.3
			137.1	137.0	137.3	137.1	-3.0	143.6	6.5	-3.3
Y29-1	3 196.0	Ⅰ	178.8	178.9	180.0	179.2	-8.8	181.8	3.0	-8.8
			179.6	179.6	179.6	179.6	-8.8	182.3	2.7	-8.8
			180.5	180.3	180.6	180.5	-8.7	182.8	2.3	-8.7
			183.2	182.9	183.1	183.1	-8.6	185.2	2.0	-8.6
			184.3	184.0	184.6	184.3	-8.6	186.6	2.3	-8.6
Y15-1	3 104.5	Ⅰ^*	227.8	227.4	227.8	227.7	-2.7	238.3	10.5	-2.7
			229.3	229.7	229.4	229.5	-2.6	240.4	11.1	-2.7
			230.5	238.3	238.8	235.9	-2.6	241.1	10.6	-2.6
Y27-2	3 551.5	Ⅰ^*	214.3	213.8	214.5	214.2	-1.2	220.8	6.5	-1.2
			214.6	215.0	215.2	214.9	-1.3	221.1	6.5	-1.3
			215.1	217.8	218.3	217.1	-1.3	221.7	6.6	-1.3
	3 807.5	Ⅰ^*	221.9	221.6	221.9	221.8	-1.3	229.8	7.9	-1.2
			222.2	222.5	222.7	222.5	-1.4	230.5	8.3	-1.3
			222.5	222.1	222.8	222.5	-1.4	230.5	8.0	-1.3
			223.2	222.9	223.3	223.1	-1.4	231.2	8.0	-1.3
			225.8	225.5	226.0	225.8	-1.4	232.4	6.6	-1.3
注：⁺代表图 6虚线圈中数据，^*代表图 6实线圈中数据，^#代表图 7实线圈中数据。

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