膏盐影响烃源岩<i>T</i><sub>max</sub>的实质——以柴达木盆地西部古近系下干柴沟组为例

齐雯; 陈凤; 方朋; 张斌; 高硕; 洪智宾; 张平; 吴嘉

doi:10.11781/sysydz202303497

膏盐影响烃源岩T_max的实质——以柴达木盆地西部古近系下干柴沟组为例

doi: 10.11781/sysydz202303497

齐雯^1,,
陈凤²,
方朋²,
张斌³,
高硕²,
洪智宾²,
张平¹,
吴嘉^2, ,

1.
中国石油勘探开发研究院西北分院, 兰州 730020
2.
中国石油大学（北京）地球科学学院, 北京 102249
3.
中国石油勘探开发研究院, 北京 100083

基金项目:

国家自然科学基金面上项目 42273052

中国石油直属院所基础研究和战略储备技术研究基金项目 2018D-5008-04

详细信息

作者简介:
齐雯(1983—)，女，高级工程师，从事油气成藏和烃源岩地球化学研究。E-mail：qi_wen@petrochina.com.cn

通讯作者:
吴嘉(1984-), 男, 博士, 副教授, 从事实验地球化学及油气地球化学研究。E-mail: jia.wu@cup.edu.cn

中图分类号: TE122.113
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出版历程
- 收稿日期: 2022-09-23
- 修回日期: 2023-04-10
- 刊出日期: 2023-05-28

The essence of gypsum's influence on T_max of source rocks: a case study of the Lower Ganchaigou Formation of Paleogene in western Qaidam Basin

1.
Research Institute of Petroleum Exploration and Development-Northwest (NWGI), PetroChina, Lanzhou, Gansu 730020, China
2.
College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
3.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

摘要

摘要: 沉积盆地中的地质观察和热模拟实验研究均揭示了含膏泥岩生烃高峰提前的现象，而生烃高峰的提前量与膏岩含量之间的关系却尚未明确。选取柴达木盆地西部地区S49-1井中不同膏岩含量的下干柴沟组烃源岩粉末样品，对原样进行抽提，除去可溶有机质(SOM)；取部分抽提残余物进行酸洗，除去碳酸盐；对原样和两步前处理后的固体残余物分别进行岩石热解分析。与原样的T_max相比，不含SOM的残余物的T_max更高，而去除SOM和碳酸盐矿物的样品T_max更低，这表明含膏泥页岩中的SOM和硫酸盐矿物(石膏、硬石膏)均可促进有机质热演化。虽然后者的促进效果更为显著，但却与其硫酸盐矿物含量不成正比。这表明硫酸盐矿物与有机质的接触面积对T_max的影响更为重要。该结论进一步通过不同比例的干酪根与硫酸镁粉末混合物的T_max值进行了验证。因此，硫酸盐矿物的赋存状态会直接影响有机质与硫酸盐的接触关系，进而对热演化生烃进程产生影响。
- T_max /
- 含膏泥岩 /
- 生烃机理 /
- 有机—无机相互作用 /
- 下干柴沟组 /
- 古近系 /
- 柴达木盆地西部
Abstract: Geological observation and thermal simulation experiments have revealed that the peak period of hydrocarbon generation of gypsum-bearing mudstone is often advanced in sedimentary basins, but the correlation between the amount of advance and the content of gypsum is still not clear. In this study, the source rock powder samples with different gypsum content in the Lower Ganchaigou Formation from well S49-1 in the western Qaidam Basin were selected and extracted to remove soluble organic matter (SOM). Part of the extracted residue was pickled to remove carbonate. Rock pyrolysis analysis was performed on the original samples and the solid residue after two-step pretreatment. Compared to the T_max of original samples, the T_max was higher in the SOM-free residue but lower in the SOM-free and carbonate-free residue, showing that SOM and sulfate minerals (gypsum and anhydrite) in gypsum-bearing mudstone can promote the thermal evolution of organic matter. Although the latter has a more significant effect, it is not proportional to its sulfate content, indicating that the contact area of sulfate minerals and organic matter is more important to T_max. The hypothesis was verified by the T_max values of different proportions of kerogen and magnesium sulfate powder mixtures. Therefore, the occurrence state of sulfate minerals will directly affect the contact relationship between organic matter and sulfate, which in turn will affect the process of hydrocarbon generation in thermal evolution.
- T_max /
- gypsum-bearing mudstone /
- hydrocarbon generation mechanism /
- organic-inorganic interaction /
- Lower Ganchaigou Formation /
- Paleogene /
- western Qaidam Basin

HTML全文

图 1 不同前处理后样品的T_max值

Figure 1. T_max of samples after different pretreatments

下载: 全尺寸图片幻灯片

表 1 柴达木盆地西部S49-1井古近系下干柴沟组实验样品的有机地化参数、矿物比例和岩石热解参数

Table 1. Organic geochemical parameters, mineral proportion and rock pyrolysis parameters of experimental samples from Lower Ganchaigou Formation of Paleogene in well S49-1, western Qaidam Basin

样品号	深度/m	有机质类型	成熟度参数			样品状态	矿物比例XRD/%		可溶有机质/%	ω(TOC)/%	岩石热解参数
样品号	深度/m	有机质类型	C₂₉ααα20S/(20S+20R)	C₂₉αββ/(αββ+ααα)	升藿烷指数	样品状态	硬石膏	石膏	可溶有机质/%	ω(TOC)/%	S₁/(mg·g^-1)	S₂/(mg·g^-1)	T_max/℃
						原始样品	3.5	-	0.19	0.49	0.61	1.38	420
3	3 752.37	Ⅱ₂	0.317 0	0.213 3	0.613 6	抽提残余物	2.9	0.6	-	0.43	0.07	0.26	426
						去除无机碳			-	0.55	0.14	0.60	413
						原始样品	43.1	-	0.07	0.23	0.07	0.60	419
19	3 861.15	Ⅱ₂	0.377 0	0.205 2	0.339 9	抽提残余物	40.5	0.3	-	0.18	0.07	0.29	422
						去除无机碳			-	0.55	0.11	0.64	405
						原始样品	1.6	-	0.28	0.64	1.00	2.11	427
21	3 871.17	Ⅱ₁	0.349 2	0.202 9	0.602 1	抽提残余物	3.3	0.2	-	0.52	0.03	0.87	427
						去除无机碳			-	0.68	0.26	0.96	400
						原始样品	9.8	0.3	0.32	1.37	1.06	7.91	431
22	3 872.02	Ⅰ	0.374 7	0.262 6	0.598 8	抽提残余物	9.6	-	-	1.15	0.06	6.90	432
						去除无机碳			-	1.55	0.23	6.29	428

下载: 导出CSV

表 2 柴达木盆地西部S49-1井古近系下干柴沟组实验样品抽提物的族组分组成

Table 2. Group compositions of extracts from experimental samples in Lower Ganchaigou Formation of Paleogene in well S49-1, western Qaidam Basin

样品号	深度/m	族组分/%
样品号	深度/m	饱和烃	芳烃	非烃	沥青质
3	3 752.37	52.64	13.63	30.32	3.41
19	3 861.15	47.34	15.00	32.50	5.16
21	3 871.17	53.81	14.21	30.20	1.78
22	3 872.02	56.46	16.73	23.19	3.61

下载: 导出CSV

表 3 不含硫酸盐的有机质与不同比例硫酸镁的Rock-Eval实验结果

Table 3. Rock Eval results of sulfate-free organic matter with different proportions of magnesium sulfate

样品编号	质量比(干酪根∶硫酸镁粉末)	样品量/mg	S₁/(mg·g^-1)	S₂/(mg·g^-1)	T_max/℃
LCG-K	1∶0	9.7	1.11	164.75	447
K1	1∶0.1	10.0	5.98	342.34	446
K2	1∶1	10.3	9.95	208.67	445
K3	1∶10	51.3	0.16	35.58	439

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