基于包裹体信息分析准噶尔盆地柴窝堡凹陷芦草沟组储层油源及成藏期次

doi:10.19657/j.geoscience.1000-8527.2021.194

现代地质 ›› 2022, Vol. 36 ›› Issue (04): 998-1008.DOI: 10.19657/j.geoscience.1000-8527.2021.194

基于包裹体信息分析准噶尔盆地柴窝堡凹陷芦草沟组储层油源及成藏期次

郑瑞辉¹^,²(), 金霄¹^,², 郑铎¹^,²^,³, 李佳阳¹^,², 陈雪¹^,², 张枝焕¹^,²()

1.中国石油大学(北京) 地球科学学院,北京 102249
2.中国石油大学(北京) 油气资源与探测国家重点实验室,北京 102249
3.中国石化胜利油田分公司孤岛采油厂,山东东营 257015

收稿日期:2021-02-10 修回日期:2021-04-15 出版日期:2022-08-10 发布日期:2022-09-09
通讯作者: 张枝焕
作者简介:张枝焕,男,教授,博士生导师,1962年出生,有机地球化学专业,主要从事有机地球化学研究。Email: zhangzh3996@vip.163.com。
郑瑞辉,男,博士研究生,1991年出生,石油地质学专业,主要从事有机地球化学研究。Email: zhengrh2016@163.com。

Inclusion Data Analysis for the Determination of Oil Source and Accumulation Stages in Lucaogou Formation in the Chaiwopu Sag, Junggar Basin

ZHENG Ruihui¹^,²(), JIN Xiao¹^,², ZHENG Duo¹^,²^,³, LI Jiayang¹^,², CHEN Xue¹^,², ZHANG Zhihuan¹^,²()

1. College of Geoscience, China University of Petroleum, Beijing 102249, China
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum,Beijing 102249, China
3. Gudao Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257015, China

Received:2021-02-10 Revised:2021-04-15 Online:2022-08-10 Published:2022-09-09
Contact: ZHANG Zhihuan

摘要/Abstract

摘要：

柴窝堡凹陷芦草沟组原油的研究工作取得了重要进展,但由于构造沉积演化十分复杂,目前油源方面的认识仍不清楚,成藏时间尚不明确。利用改进的石油包裹体烃组分分析方法和包裹体定年技术讨论了研究区芦草沟组原油的来源和成藏期次。结果表明,研究区芦草沟组储层第一期充注原油正构烷烃主峰碳数低,C₂₁三环萜烷和C₂₇甾烷相对丰度较高,显示蓝色荧光,为北部半深湖—深湖相芦草沟组烃源岩生成的高成熟原油,于早白垩世在达1井区聚集成藏;第二期充注原油正构烷烃主峰碳数高,C₂₀三环萜烷或C₂₃三环萜烷、C₂₉甾烷相对丰度较高,显示黄绿色、黄色荧光,为研究区滨浅湖相芦草沟组烃源岩生成的较低成熟度原油,于晚白垩世末期—古新世早期在达1井区聚集成藏。

关键词: 柴窝堡凹陷, 包裹体烃组分, 油气来源, 成藏期次, 油气成藏过程

Abstract:

Hydrocarbon accumulation in the Chaiwopu Sag has been well documented, however the tectonic and sedimentary evolution in the Chaiwopu Sag is complex, and the source of oil and the timing of hydrocarbon accumulation are still controversial. Here, the hydrocarbon source and accumulation of the Lucaogou Formation is discussed through an improved molecular composition of inclusion method, and the fluid inclusions in the Chaiwopu Sag (Junggar Basin). Distribution characteristics of the n-alkanes are dominated by low carbon numbers, and the relative abundance of C₂₁-tricyclic terpane and C₂₇-steranes are higher in the early-charging oil, showing blue fluorescence. The first stage (Early Cretaceous) oil came mainly from the Lucaogou Formation (semi-)deep lacustrine-facies source rocks in the north. Meanwhile, distribution characteristics of the n-alkanes are dominated by high carbon numbers, and the relative abundance of C₂₀-tricyclic terpane or C₂₃-tricyclic terpane and C₂₉-steranes are higher in the second-charging oil, showing yellow-green or yellow fluorescence. The second stage lasted from the end Late Cretaceous to the Early Paleocene, and the oil came mainly from the local Lucaogou Formation shore-shallow lacustrine-facies source rocks.

Key words: Chaiwopu Sag, inclusion molecular composition, hydrocarbon source, hydrocarbon accumulation period, hydrocarbon accumulation process

中图分类号:

TE122

郑瑞辉, 金霄, 郑铎, 李佳阳, 陈雪, 张枝焕. 基于包裹体信息分析准噶尔盆地柴窝堡凹陷芦草沟组储层油源及成藏期次[J]. 现代地质, 2022, 36(04): 998-1008.

ZHENG Ruihui, JIN Xiao, ZHENG Duo, LI Jiayang, CHEN Xue, ZHANG Zhihuan. Inclusion Data Analysis for the Determination of Oil Source and Accumulation Stages in Lucaogou Formation in the Chaiwopu Sag, Junggar Basin[J]. Geoscience, 2022, 36(04): 998-1008.

图/表 9

图1 准噶尔盆地柴窝堡凹陷构造划分及取样井位分布图(a)、A-A'剖面地震解释(b)

Fig.1 Distribution of structure units and sampling wells (a), and seismic interpretation of A-A' section (b) in the Chaiwopu Sag, Junggar Basin

表1 柴窝堡凹陷达坂城次凹中央断褶带石油包裹体组分分析样品

Table 1 Samples for molecular composition of inclusion analysis in the central thrust-fold belt of Dabancheng Subsag, Chaiwopu Sag

编号	井号	层位	深度/m	类型
C-1	柴参1侧	P₂l	3 025.00	砂砾岩
C-3	柴参1侧	P₂l	3 054.65	砂砾岩
C-4	柴参1侧	P₂l	3 562.00	砂砾岩
D-1	达1井	P₂l	2 639.13	砂砾岩

图2 柴窝堡凹陷中央断褶带部分芦草沟组储层原油生物标志物分布特征 Pr.姥鲛烷;Ph.植烷;C19TT.C19-三环萜烷;C20TT.C20-三环萜烷;C21TT.C21-三环萜烷;C23TT.C23-三环萜烷;C24TE.C24-四环萜烷;Ts.C27-18α(H),21β(H) -22,29,30-三降新藿烷;Tm.C27-17α(H),21β(H)-22,29,30三降藿烷;C29DH.C29 - 25-降藿烷;C29H.C29- 30-降藿烷;C30H. C 30 -藿烷;G.伽马蜡烷; C27ST.C27ααα-胆甾烷20R;C28ST.C28ααα-胆甾烷20R;C29ST. C 2 9ααα-胆甾烷20R

Fig.2 Distribution characteristics of crude oil biomarkers in the Lucaogou Formation reservoir of the central thrust-fold belt, Chaiwopu Sag

图3 柴窝堡凹陷中央断褶带部分芦草沟组储层包裹体原油的生物标志物分布特征(符号说明同图2)

Fig.3 Distribution characteristics of crude oil biomarkers in the inclusions from the Lucaogou Formation reservoir, the central thrust-fold belt, Chaiwopu Sag

表2 柴窝堡凹陷中央断褶带部分芦草沟组储层原油和包裹体油的生物标志物参数分布特征

Table 2 Distribution characteristics of biomarker parameters of crude oil and hydrocarbon inclusions from the Lucaogou Formation reservoir, the central thrust-fold belt,Chaiwopu Sag

类型	储层孔隙油样					包裹体油样
	柴参1侧		达1			柴参1侧						达1
	3 054.65 m	3 562.00 m	2 639.13 m	2 960.20 m		3 025.00 m		3 054.65 m		3 562.00 m		2 639.13 m
Pr/Ph	0.64	0.74	0.54	0.96	0.46		0.52		0.46		0.33
G/C₃₀H	0.19	0.22	0.18	0.28	0.22		0.27		0.39		0.23
C₂₄TE/C₂₆TT	0.44	0.44	0.39	0.52	0.74		0.67		0.71		0.80
Ts/Tm	0.61	0.76	0.77	0.57	0.97		0.89		0.99		0.85
Ts/(Ts+Tm)	0.38	0.43	0.43	0.47	0.55		0.57		0.59		0.51
C₂₇/C_27-29ST	0.26	0.26	0.29	0.20	0.45		0.48		0.48		0.50
C₂₈/C_27-29ST	0.37	0.31	0.32	0.41	0.24		0.24		0.25		0.24
C₂₉/C_27-29ST	0.37	0.43	0.40	0.39	0.31		0.28		0.27		0.26
C₂₉DH/C₂₉H	0.23	0.31	0.30	0.31	0.10		0.21		0.16		0.22
C₂₃TT/(C₂₃TT+C₃₀H)	0.59	0.58	0.52	0.53	0.61		0.68		0.75		0.75

图4 柴窝堡凹陷中央断褶带部分芦草沟组烃源岩氯仿抽提物总离子流图、藿烷和甾烷生物标志物分布特征(符号说明同图2)

Fig.4 Total-ion chromatograms (TIC), terpanes (m/z = 191) and steranes (m/z = 217) of the saturated hydrocarbons from the Lucaogou Formation, the central thrust-fold belt of the Chaiwopu Sag

图5 柴窝堡凹陷芦草沟组包裹体油、储层原油油和烃源岩生标参数特征

Fig.5 Biomarker parameters of petroleum trapped in the petroleum inclusions and reservoirs and source rock of the Lucaogou Formation, Chaiwopu Sag

图6 柴窝堡凹陷达坂城次凹中央断褶带达1井包裹体照片 (a)、(b)达1井,2 639.13 m,P2l,单偏光和UV激发荧光,沿孔洞充填方沸石微裂隙分布的气液烃包裹体,显示蓝色荧光;(c)、(d)达1井,2 639.13 m,P2l,单偏光,沿孔洞充填方沸石微裂隙分布的气液烃包裹体;(e)—(h)达1井,2 635.95 m,P2l,单偏光和UV激发荧光,沿切穿孔洞充填方沸石微裂隙成带状分布的气液烃包裹体,显示黄绿色、黄色荧光

Fig.6 Microphotographs of inclusions of well Da 1 in the central thrust-fold belt of the Dabancheng subsag,Chaiwopu Sag

图7 柴窝堡凹陷达1井芦草沟组热史、埋藏史图及原油成藏期

Fig.7 Reconstructed thermal and burial history and the hydrocarbon accumulation timing of well Da 1 in the Chaiwopu Sag

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基于包裹体信息分析准噶尔盆地柴窝堡凹陷芦草沟组储层油源及成藏期次

Inclusion Data Analysis for the Determination of Oil Source and Accumulation Stages in Lucaogou Formation in the Chaiwopu Sag, Junggar Basin

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