准噶尔盆地南缘柴窝堡凹陷泥页岩地球化学和矿物学特征研究

熊金红; 梁明亮; 曹占元; 王宗秀; 郑建京; 王作栋

准噶尔盆地南缘柴窝堡凹陷泥页岩地球化学和矿物学特征研究

熊金红^{1, 2,},
梁明亮^{1, 3},
曹占元³,
王宗秀¹,
郑建京³,
王作栋³

1.
中国地质科学院地质力学研究所, 北京 100081
2.
北京大学地球与空间科学学院, 北京 100871
3.
中国科学院油气资源研究重点实验室/甘肃省油气资源研究重点实验室, 甘肃兰州 730000

基金项目:

国家自然科学基金项目 41072106

中国科学院西部行动计划项目 KZCX2-XB3-12

详细信息

作者简介:
熊金红(1986-), 男, 在读博士研究生, 研究方向为构造地质学.E-mail:278031772@qq.com

中图分类号: P593
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- 文章访问数: 190
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- 被引次数: 0
出版历程
- 收稿日期: 2017-02-10
- 刊出日期: 2017-08-01

THE GEOCHEMICAL AND MINERALOGICAL CHARACTERISTICS OF SHALES IN CHAIWOBU DEPRESSION, SOUTHERN MARGIN OF JUNGGAR BASIN

1.
Institute of Geomechaniscs, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
School of Earth and Space Sciences, Peking University, Beijing 100871, China
3.
Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences/Key Laboratory of Petroleum Resources Research, Lanzhou 730000, Gansu, China

摘要

摘要: 利用XRD、Rock-eval和气相色谱—质谱仪对准格尔南缘柴窝堡凹陷上石炭统、上二叠统及下侏罗统的泥页岩进行了地球化学和矿物学特征分析。有机地球化学实验结果指示，柴窝堡凹陷石炭纪至二叠纪经历了较长时期的淡水—微咸水沉积环境，有机质来源具有相似的母源输入特征，干酪根类型具有Ⅱ型混合母质特征；有机质热演化特征表明，下侏罗统泥页岩处于低熟阶段，上石炭统与上二叠统泥页岩具有机质丰度较高、有机质类型丰富、热演化处于成熟—高成熟阶段等特点；矿物学特征显示，上二叠统泥页岩长石、石英等脆性矿物含量为73%，粘土矿物次之，指示其脆性指数较高，具有较好的可压裂性和粘土表面吸附性。结合前人认识，预测该段泥页岩中可能蕴藏着一定规模的页岩气资源，具有较好的页岩气资源前景和勘探潜力。
- 柴窝堡凹陷 /
- 泥页岩 /
- 生物标志物 /
- 矿物学 /
- 页岩气
Abstract: Using XRD, Rock-eval and GC-MS, kerogen type, organic geochemical characteristics and inorganic mineralogy features of shales in upper Carboniferous, upper Permian, and lower Jurassi from the Chaiwobu depression at southern margin of Junggar Basin were analyzed. The organic geochemical index shows that from Carboniferous to Permian, it has been a long period of fresh-brackish water sedimentary environment in Chaiwobu depression. The sources of organic matter shared the similar source input characteristics, and kerogen type were mainly featured by type Ⅱ. The thermal evolution of organic matter indicates that shales in lower Jurassic were in low mature stage while shales in upper Carboniferous and upper Permian showed the features of high abundance, rich in types and mature-high mature stage in the thermal evolution. The mineralogical characteristics show that the content of brittle minerals feldspar and quartz in upper Permian shales is 73%, followed by clay mineral, indicating a high brittleness index and good property of fracturing and adsorption. Combined with the previous studies, it is predicted that a certain scale of shale gas resources may be contained in shales of this member with a good prospect and potential for exploration.
- Chaiwobu Depression /
- shale /
- biomarker /
- mineralogy /
- shale gas

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图 1 柴窝堡凹陷构造单元划分及样品采集点

Figure 1. Structural unit division and sample collection sites in Chaiwobu Depression

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图 2 泥页岩样品Pr/C₁₇与Ph/C₁₈直角对数图

Figure 2. Crossplot of Pr/C₁₇ and Ph/C₁₈ of shale samples

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图 3 泥页岩样品饱和烃总离子流图

Figure 3. Total ion current of saturated hydrocarbon of shale samples

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图 4 烃源岩萜烷参数特征

Figure 4. Characteristics of terpane parameters in source rock

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图 5 泥页岩样品甾烷分布三角图

Figure 5. Triangular chart of the distribution of sterane of shale samples

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图 6 研究区石炭系—侏罗系泥页岩全岩矿物组成分布图

Figure 6. Composition and distribution of the minerals in shales in Carboniferous-Jurassic of the study area

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表 1 样品的基础地球化学参数

Table 1. Basic geochemical parameters of the shale samples

样品	层位	岩性	TOC/%	T_MAX/℃	S₁/(mg/g)	S₂/(mg/g)	PI/(S1/(S1+S2))	I_H/(mg/g)	I_O/(mg/g)
CWB-3	J₁b	褐色泥页岩	3.27	436	0.03	6.15	0.01	188	110
CWB-2	P₂h	碳色泥岩	0.31	449	0.01	0.02	0.65	6	135
CWB-1	P₁j	炭质泥岩	0.30	448	0.08	0.03	0.28	10	157
CWB-5	C₂sh	灰质泥岩	0.93	538	0.01	0.00	0.81	0	67
CWB-4	C₂sh	灰质泥岩	0.29	446	0.01	0.00	0.66	0	121

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表 2 样品氯仿沥青“A”族组成特征

Table 2. Composition characteristics of chloroform bitumen "A" group samples

样品	层位	饱和烃/%	芳烃/%	非烃/%	沥青质/%	非+沥/%	饱芳比	非沥比
CWB-03	J₁b	12.07	1.45	81.13	5.35	86.48	8.32	15.16
CWB-02	P₂h	24.73	5.49	43.41	26.37	69.78	4.50	1.65
CWB-01	P₁j	14.06	13.53	27.07	45.34	72.41	1.04	0.60
CWB-05	C₂sh	3.23	2.15	68.82	25.81	94.62	1.50	2.67
CWB-04	C₂sh	16.88	8.44	42.86	31.82	79.86	2.00	1.35

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表 3 正构烷烃和类异戊二烯烷烃生物标志化合物参数

Table 3. Biomarker parameters of n-alkanes and isoprenoid

样品	层位	碳数	峰型	主峰	Pr/Ph	Pr/nC₁₇	Ph/nC₁₈	∑C_22-/∑C₂₃₊	OEP_25-29
CWB-03	J₁b	12~33	双峰	17/25	1.44	0.30	0.26	0.67	4.04
CWB-02	P₂h	13-31	双峰	17/23	1.17	0.70	0.68	1.19	1.13
CWB-01	P₁j	14-32	双峰	17/27	1.00	0.73	0.72	0.18	1.04
CWB-05	C₂sh	14-31	双峰	17/25	1.03	0.87	0.86	1.02	0.90
CWB-04	C₂sh	14-30	双峰	17/25	1.03	0.60	0.71	1.38	1.13

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表 4 烃源岩萜烷和甾类化合物参数

Table 4. Parameters of terpane compounds and sterane compounds in source rock

样品编号	萜烷						甾烷
	∑三环萜烷/ ∑藿烷	Ts/Tm	G/C₃₀H	C₃₁22S/ (S+R)	C₃₂22S/ (S+R)	C₂₉H/ C₃₀H	C₂₉ββ/ (αα+ββ)	C₂₉20S/ (S+R)	相对含量/%
	∑三环萜烷/ ∑藿烷	Ts/Tm	G/C₃₀H	C₃₁22S/ (S+R)	C₃₂22S/ (S+R)	C₂₉H/ C₃₀H	C₂₉ββ/ (αα+ββ)	C₂₉20S/ (S+R)	C₂₇	C₂₈	C₂₉
CWB-03	0	0.13	0.01	0.08	0.60	0.37	0.34	0.15	32.59	24.44	42.96
CWB-02	2.59	0.89	0.09	0.60	0.67	0.68	0.40	0.47	45.74	24.47	29.79
CWB-01	1.26	0.85	0.16	0.56	0.63	0.76	0.49	0.50	26.44	32.18	41.38
CWB-05	3.02	0.86	0.11	0.58	0.67	0.78	0.40	0.43	44.44	22.22	33.33
CWB-04	3.08	0.89	0.11	0.59	0.60	0.79	0.40	0.45	39.71	26.47	33.82

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