泥页岩热模拟排出油与滞留油中17<i>α</i>(H)-重排藿烷的成熟度指示规律

李姗姗; 白斌; 严刚; 徐耀辉; 刘岩

doi:10.11781/sysydz202205887

泥页岩热模拟排出油与滞留油中17α(H)-重排藿烷的成熟度指示规律

doi: 10.11781/sysydz202205887

李姗姗^{1, 2,},
白斌^3, ,,
严刚^{1, 2},
徐耀辉^{1, 2},
刘岩^{1, 2}

1.
油气地球化学与环境湖北省重点实验室(长江大学资源与环境学院), 武汉 430100
2.
油气资源与勘探技术教育部重点实验室(长江大学), 武汉 430100
3.
中国石油勘探开发研究院, 北京 100083

基金项目:

国家自然科学基金项目 41972122

国家自然科学基金项目 42072186

详细信息

作者简介:
李姗姗(1991-), 女, 硕士研究生, 研究方向为有机地球化学。E-mail: 522197462@qq.com

通讯作者:
白斌(1981-), 男, 博士, 高级工程师, 从事沉积储层地质学研究。E-mail: baibin81@petrochina.com.cn

中图分类号: TE122.11
计量
- 文章访问数: 486
- HTML全文浏览量: 180
- PDF下载量: 47
- 被引次数: 0
出版历程
- 收稿日期: 2022-02-17
- 修回日期: 2022-07-13
- 刊出日期: 2022-09-28

Maturity indication of 17α(H)-diahopane in expelled and retained oils from artificial maturation experiments of mud shale

LI Shanshan^{1, 2
,},
BAI Bin^{3
, ,},
YAN Gang^{1, 2},
XU Yaohui^{1, 2},
LIU Yan^{1, 2}

1.
Hubei Key Laboratory of Petroleum Geochemistry and Environment(School of Resources and Environment, Yangtze University), Wuhan, Hubei 430100, China
2.
Key Laboratory of Exploration Technologies for Oil and Gas Resources of Ministry of Education (Yangtze University), Wuhan, Hubei 430100, China
3.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

摘要

摘要: 在沉积有机相接近的前提条件下，重排藿烷的相对丰度与热成熟度密切相关。选用鄂尔多斯盆地低熟(R_o为0.58%)富有机质(总有机碳含量为3.87%)泥页岩进行生排烃热模拟实验，通过气相色谱—质谱(GC-MS)对排出油和滞留油中17α(H)-重排藿类化合物进行了检测与分析，并结合热模拟残余岩样的实测镜质体随机反射率(R_o)界定了17α(H)-重排藿烷参数作为成熟度指标的适用范围。结果表明，无论在排出油还是滞留油中，参数C₂₉*/(C₂₉*+C₂₉H)和C₃₀*/(C₃₀*+C₃₀H)呈现出类似的三段式变化特征，均随实验温度的升高先降低后升高最后降低，表明两个参数可能是较好的油源对比指标。在325 ℃之前，即R_o＜1.01%时，参数变化幅度均不明显；但在325~385 ℃之间，两个参数均随温度的升高呈现显著的上升趋势，表明在有机质成熟中期—高成熟早期阶段(1.01%＜R_o＜1.48%)两个参数均可作为有效的成熟度指标。
- 热模拟实验 /
- 排出油 /
- 滞留油 /
- 17α(H)-重排藿烷 /
- 热演化
Abstract: With the comparable sedimentary organic phase, the relative abundance of rearranged hopanes can be correlated to maturity degree. By the approach of artificial maturation experiments of low-maturity (R_o=0.58%) and organic-rich (TOC=3.87%) mud shale collected from the Ordos Basin, 17α(H)-diahopanes in expelled and retained oils were examined by gas chromatography-mass spectrometry (GC-MS). The thermal evolution characteristics of parameters related to 17α(H)-diahopane were discussed, and the maturity range of these parameters as maturity indicators was proposed, combined with the random mean vitrinite reflectance (R_o) of maturated rock samples of each step of pyrolysis. Results show that the parameters of C₂₉*/(C₂₉*+C₂₉H) and C₃₀*/(C₃₀*+C₃₀H) have similar three-stage variations. As experimental temperature increased, the values of the two parameters decreased firstly, then increased and finally decreased again, indicating that they may be good indicators for oil-source correlation. Before 325 ℃, i.e. R_o < 1.01%, both parameters showed insignificant changes. However, they both showed an obvious upward trend with increasing temperature from 325 to 385 ℃, indicating that they were valid indicators for maturity from the moderate to the early stages of high maturity (i.e. 1.01% < R_o < 1.48%).
- pyrolysis experiment /
- expelled oil /
- retained oil /
- 17α(H)-diahopane /
- thermal evolution

HTML全文

图 1 热模拟原始样品二氯甲烷抽提物中规则藿烷与重排藿烷化合物质量色谱图

Figure 1. Mass chromatograms of regular and rearranged hopane compounds in dichloromethane extracts of original samples

下载: 全尺寸图片幻灯片

图 2 不同温度点热模拟排出油和滞留油饱和烃m/z 191质量色谱图

1.C₂₇18α(H), 21β(H)-22, 29, 30-三降新藿烷(Τs); 2.C₂₇17α(H)-22, 29, 30-三降藿烷(Τm)；3.C₂₉17α(H)-重排藿烷(C₂₉*)；4. C₂₉17α(H), 21β(H)-30-降藿烷(C₂₉H)；5.C₂₉18α(H), 21β(H)-30-降新藿烷(C₂₉Τs)；6.C₃₀17α(H)-重排藿烷(C₃₀*)；7.C₃₀17α(H), 21β(H)-藿烷(C₃₀H)；8.C₃₀17α(H), 21β(H)-29-升藿烷(C₃₁H)；9.伽马蜡烷(G)

Figure 2. m/z 191 mass chromatograms of saturates in expelled and retained oils at different temperatures

下载: 全尺寸图片幻灯片

图 3 热模拟排出油(a，b)和滞留油(c，d)中C₂₉*、C₂₉H、C₃₀*、C₃₀H相对丰度的变化特征

Figure 3. Characteristics of relative abundances of C₂₉*, C₂₉H, C₃₀* and C₃₀H in expelled (a, b) and retained (c, d) oils for pyrolysis experiments

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图 4 热模拟排出油和滞留油中重排藿烷成熟度参数随温度的变化特征

Figure 4. Temperature vs. maturity parameters of rearranged hopane in expelled and retained oils for pyrolysis experiments

下载: 全尺寸图片幻灯片

图 5 17α(H)-重排藿烷参数与重排甾烷及Ts/Tm成熟度参数的相互关系

Figure 5. Relationship between rearranged hopane and sterane maturity parameters and Ts/Tm

下载: 全尺寸图片幻灯片

表 1 热模拟实验条件及残余岩样实测镜质体反射率

Table 1. Experimental conditions and vitrinite reflectance values of pyrolysis residual rocks

模拟温度/℃	地层压力/MPa	静岩压力/MPa	样品质量/g	实测R_o/%
280	21.00	50.00	60.15	0.70
325	23.00	55.00	58.30	1.01
355	28.00	67.00	60.31	1.34
385	33.00	79.00	55.13	1.48
445	39.00	94.00	56.35	1.95

下载: 导出CSV

表 2 不同温度热模拟排出油和滞留油中规则藿烷与重排藿烷相对丰度及相关参数

Table 2. Relative abundances and parameters of regular and rearranged hopane in expelled and retained oils of pyrolysis at different temperatures

	温度/ ℃	C₂₉*/%	C₃₀*/%	C₂₉H/%	C₃₀H/%	C₃₀*/C₃₀H	C₂₉/(C₂₉+C₂₉H)	C₃₀/(C₃₀+C₃₀H)
排出油	原样	2.52	3.20	27.07	67.22	0.05	0.09	0.05
	280	2.98	3.38	34.05	59.59	0.06	0.08	0.05
	325	3.23	3.20	30.76	62.81	0.05	0.07	0.05
	355	2.85	3.86	33.93	59.36	0.07	0.08	0.06
	385	3.89	4.16	34.50	57.44	0.07	0.10	0.07
	445	3.09	3.40	35.50	58.02	0.06	0.08	0.06
滞留油	280	2.37	3.32	27.67	66.64	0.05	0.08	0.05
	325	1.80	2.96	30.13	65.12	0.05	0.06	0.04
	355	2.37	3.31	38.64	55.69	0.06	0.06	0.06
	385	7.25	5.19	38.59	48.97	0.11	0.16	0.10
	445	3.84	4.75	40.45	50.95	0.09	0.09	0.09

下载: 导出CSV

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