湘西北地区下寒武统牛蹄塘组页岩有机地球化学与矿物组成特征

郭永岩; 梁明亮; 王宗秀; 张林炎; 李会军; 李小诗

doi:10.12090/j.issn.1006-6616.2019.25.03.036

湘西北地区下寒武统牛蹄塘组页岩有机地球化学与矿物组成特征

doi: 10.12090/j.issn.1006-6616.2019.25.03.036

郭永岩^{1, 2,},
梁明亮^{1, 3},
王宗秀^{1, 3, ,},
张林炎^{1, 3},
李会军^{1, 3},
李小诗^{1, 3}

1.
中国地质科学院地质力学研究所, 北京 100081
2.
北京市地质勘察技术院, 北京 102218
3.
中国地质科学院页岩油气资源调查评价重点实验室, 北京 100081

基金项目:

国家自然科学基金 41672201

中国地质调查局地质调查专项 121201104000150006

详细信息

作者简介:
郭永岩(1991-), 女, 在读硕士, 地质工程专业。E-mail:y1490532451@163.com

通讯作者:
王宗秀(1959-), 男, 教授, 从事能源地质学方面的研究。E-mail:wangzongxiu@sohu.com

中图分类号: P618.13
计量
- 文章访问数: 233
- HTML全文浏览量: 51
- PDF下载量: 12
- 被引次数: 0
出版历程
- 收稿日期: 2018-01-20
- 修回日期: 2018-11-02
- 刊出日期: 2019-06-28

ORGANIC GEOCHEMISTRY AND MINERAL COMPOSITION CHARACTERISTICS IN SHALES OF NIUTITANG FORMATION, NORTHWESTERN HUNAN

GUO Yongyan^{1, 2
,},
LIANG Mingliang^{1, 3},
WANG Zongxiu^{1, 3
, ,},
ZHANG Linyan^{1, 3},
LI Huijun^{1, 3},
LI Xiaoshi^{1, 3}

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Beijing Institute of Geo-exploration Technology, Beijing 102218, China
3.
Key Lab of Shale Oil and Gas Geological Survey, Chinese Academy of Geological Sciences, Beijing 100081, China

摘要

摘要: 文章以湘西北地区下寒武统牛蹄塘组页岩为研究对象，分析其有机地球化学及无机矿物特征，重点对其烃源岩生物标志化合物特征进行分析。结果表明：该套页岩残余有机碳（TOC）含量高、氯仿沥青"A"含量低、生烃潜量"S₁+S₂"较小，镜质组反射率R_o在2.3%~3.19%之间，达到了过成熟阶段，以生成干气为主。分子生物标志化合物结果显示正构烷烃呈双峰型，碳数大于C₂₂的中-高碳数烃占优势；Pr/Ph平均值为0.31，植烷优势明显，指示强还原的海相沉积环境；萜烷丰度顺序为五环三萜烷>三环萜烷>四环萜烷，γ-环蜡烷与C₃₀霍烷的比值普遍大于0.3，指示其沉积母质以浮游生物及海洋性自养菌为主，含有部分藻类；Ts/（Ts+Tm）在0.35~0.38之间，与镜质组反射率对成熟度的检测结果相互印证；规则甾烷C₂₇ > C₂₉ > C₂₈，指示其母质来源以浅海生物来源为主，所有样品中均检测出孕甾烷、升孕甾烷、重排甾烷及4-甲基甾烷，表明其经历过微生物降解作用。全岩矿物组分分析显示该套页岩具备较好的开发物性条件和较强的吸附性能。综合以上分析结果，提出研究区牛蹄塘组页岩具备较好的页岩气成烃成藏的物质条件，并为该区深入开展页岩气勘探目标区优选奠定了很好的工作基础。
- 湘西北 /
- 下寒武统 /
- 牛蹄塘组 /
- 页岩 /
- 生物标志化合物
Abstract: The article aims to analyze the organic geochemistry and inorganic mineral characteristics of the Lower Cambrian Niutitang Formation shale in northwestern Hunan Province. The main research methods include carbon-sulfur measurement method, rock pyrolysis method, chloroform asphalt "A" measurement method, clay mineral, and whole rock X-ray diffraction analysis method. The results show that the content of TOC in the Niutitang Formation is high, the content of "A" in chloroform asphalt is low, and the potential of generating hydrocarbon "S1+S2" is low. Most of the vitrinite reflectances Ro range from 2.3% to 3.19%, which have reached the mature stage and mainly generate dry gas. The results of biomarkers show that the n-alkane presents bimodal pattern and the medium-and high-carbon number hydrocarbons with carbon number more than C₂₂ are dominant. With Pr/Ph average value of 0.31, the advantage of phytate is obvious, indicating the strong reduced marine sedimentary environment. The right angle diagram of Pr/nC₁₇ and Ph/nC₁₈ shows that the organic matter types of shale are mainly type Ⅰ and Ⅱ1; The terpene abundance order is pentacyclic triterpeneane > tricyclic terpane > tetracyclic terpene. The ratio of γ-alkane to C₃₀ Hopane is generally greater than 0.3, indicating that its sedimentary parent materials are dominated by plankton and marine autotrophic bacteria, with part of algae; Ts/(Ts+Tm) range from 0.53 to 0.60, which is consistent with the detection results of vitrinite reflectance on maturity. The mass chromatogram of saturated hydrocarbon m/z 217 is C₂₇ > C₂₉ > C₂₈ and the ratio of C₂₇/C₂₉ is more than 1, indicating that its parent materials are dominated by the shallow sea creatures. Pregnane, homo-pregnane, diasterane, and 4-methyl sterane were detected in all samples, indicating that they had undergone microbial degradation. Based on the above analysis results, it is proposed that shales of the Niutitang Formation in the study area have good material conditions for shale gas hydrocarbon accumulation. This research work has laid a good working foundation to carry out the shale gas exploration in the target area.
- northwestern Hunan /
- lower Paleozoic /
- Niutitang Formation /
- shale /
- biomarkers
注释:

责任编辑:范二平

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图 1 采样位置图(据参考文献[9]修改)

Ⅰ₁—扬子准地台；Ⅰ₂—华南褶皱带；Ⅱ₁—八面山褶皱带；Ⅱ₂—江南地轴；Ⅲ₁—鹤峰复背斜；Ⅲ₂—桑植复向斜；Ⅲ₃—临湘复向斜；Ⅲ₄—古丈隆起；Ⅲ₅—沅麻盆地；Ⅲ₆—新晃隆起；Ⅲ₇—洪江隆起；Ⅲ₈—黔滁鞍部构造；Ⅲ₉—冷家溪隆起；Ⅲ₁₀—洞庭坳陷；Ⅲ₁₁—幕阜山隆起；Ⅲ₁₂—宁乡凹陷

Figure 1. Sample location map (modified after reference [9])

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图 2 样品饱和烃质量色谱图(m/z 85)

Figure 2. The mass chromatogram (m/z 85) of saturated hydrocarbon of samples

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图 3 样品Pr/C₁₇与Ph/C₁₈关系图

Figure 3. The crossplot of Pr/C₁₇ and Ph/C₁₈ of shale samples

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图 4 样品饱和烃质量色谱图(m/z 191)

Figure 4. The mass chromatogram (m/z 191) of saturated hydrocarbon of samples

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图 5 样品饱和烃质量色谱图(m/z 217)

Figure 5. The mass chromatogram (m/z 217) of saturated hydrocarbon of samples

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图 6 样品矿物组成柱状简图

Figure 6. The mineral composition content of samples

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表 1 湘西北牛蹄塘组页岩有机质组成特征

Table 1. Characteristics of shale organic matter composition of Niutitang Formation in northwestern Hunan

采样点	样品编号	TOC/%	R_b/%	R_o/%	S₁+S₂/(mg/g)	氯仿沥青“A”/%	饱和烃/芳烃
张家界田旦峪村	15-264-1	0.43	3.96	2.85	0.06	0.0021	10.00
	15-264-2	3.46	/	/	0.21	0.0026	11.01
	15-264-3	0.29	3.48	2.55	0.04	0.0022	2.67
	15-264-4	0.37	3.58	2.61	0.07	0.002	5.99
	15-264-5	1.24	3.58	2.61	0.16	0.0019	3.00
怀化	15-279-1	2.06	3.07	2.30	0.13	0.0383	4.43
花垣排吾乡	NF15-222-1	1.18	4.32	3.07	0.05	0.0027	6.00
花垣排吾乡	NF15-222-2	9.75	4.51	3.19	0.06	0.002	4.00
益阳泥江口镇	NF15-01-1	2.48	/	/	0.06	0.0024	1.60
	NF15-01-2	3.53	/	/	0.06	0.0032	6.50
	NF15-01-3	10.17	/	/	0.04	0.0018	1.75
	NF15-01-4	15.69	/	/	0.04	0.0024	7.00
	NF15-01-5	12.76	/	/	0.05	0.0021	4.33
	NF15-01-9	0.33	/	/	0.13	0.0034	8.00

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表 2 页岩样品正构烷烃及类异戊二烯烃参数

Table 2. Parameters of n-alkanes and isoprenoid of shale samples

样品编号	主峰碳	Pr/Ph	Pr/nC₁₇	Ph/nC₁₈	∑C_21-/∑C₂₂₊
15-264-1	C₁₈/C₂₅	0.32	0.54	1.21	0.37
15-264-2	C₁₈/C₂₅	0.3	0.54	1.19	0.32
15-264-3	C₁₈/C₂₅	0.42	0.58	1.15	0.65
15-264-4	C₁₈/C₂₅	0.33	0.57	1.28	0.34
15-264-5	C₁₈/C₂₅	0.24	0.58	1.23	0.71
15-279-1	C₁₈/C₂₄	0.11	0.62	1.17	0.73
NF15-01-1	C₁₈/C₂₅	0.3	0.64	1.39	0.39
NF15-01-2	C₁₈/C₂₃	0.32	0.71	1.54	0.63
NF15-01-3	C₁₈/C₂₃	0.33	0.71	1.59	0.38
NF15-01-4	C₁₈/C₂₄	0.38	0.71	1.37	0.82
NF15-01-5	C₁₈/C₂₃	0.33	0.84	1.87	0.66
NF15-01-9	C₁₈/C₂₄	0.27	0.53	1.05	0.47
NF15-222-1	C₁₈/C₂₅	0.32	0.58	1.33	0.32
NF15-222-2	C₁₈/C₂₅	0.34	0.7	1.39	0.34

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表 3 页岩样品萜类和甾类化合物参数

Table 3. Parameters of terpane and sterane of shale samples

样品编号	萜烷				甾烷
	Ts/(Ts+Tm)	γ/C₃₀H	C₃₁22S/(S+R)	C₃₂22S/(S+R)	C₂₉ββ/(αα+ββ)	C₂₉20S/(S+R)	相对含量/%
	Ts/(Ts+Tm)	γ/C₃₀H	C₃₁22S/(S+R)	C₃₂22S/(S+R)	C₂₉ββ/(αα+ββ)	C₂₉20S/(S+R)	C₂₇	C₂₈	C₂₉
15-264-1	0.36	0.34	0.6	0.58	0.63	0.44	36.89	29.56	33.55
15-264-2	0.37	0.3	0.61	0.58	0.62	0.47	37.64	30.38	31.98
15-264-3	0.37	0.31	0.61	0.58	0.63	0.45	39.15	28.68	32.17
15-264-4	0.35	0.29	0.62	0.58	0.60	0.47	35.46	32.17	32.37
15-264-5	0.38	0.29	0.62	0.58	0.61	0.45	35.93	30.51	33.56
15-279-1	0.36	0.31	0.61	0.58	0.63	0.44	38.36	28.82	32.82
NF15-01-1	0.35	0.31	0.61	0.58	0.61	0.46	38.38	30.01	31.61
NF15-01-2	0.36	0.29	0.61	0.58	0.61	0.47	38.6	30.22	31.18
NF15-01-3	0.36	0.3	0.61	0.58	0.61	0.47	36.58	31.38	32.04
NF15-01-4	0.36	0.31	0.61	0.58	0.62	0.44	38.98	28.57	32.45
NF15-01-5	0.36	0.3	0.61	0.58	0.62	0.45	38.51	28.96	32.53
NF15-01-9	0.36	0.31	0.61	0.58	0.61	0.46	37.57	29.89	32.54
NF15-222-1	0.35	0.35	0.6	0.58	0.61	0.47	36.91	31.09	32
NF15-222-2	0.35	0.34	0.6	0.58	0.62	0.45	36.5	30.55	32.95

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