珠江口盆地阳江凹陷不同成藏期次原油成因及混源比例分析

熊万林; 龙祖烈; 朱俊章; 杨兴业; 丰勇

doi:10.11781/sysydz202102315

珠江口盆地阳江凹陷不同成藏期次原油成因及混源比例分析

doi: 10.11781/sysydz202102315

1.
中海石油(中国)有限公司深圳分公司, 广东深圳 518054
2.
长江大学地球科学学院, 武汉 430100

基金项目:

“十三五”国家科技重大专项“南海东部海域勘探新领域及关键技术” 2016ZX05024-004

详细信息

作者简介:
熊万林(1987—), 男, 硕士, 工程师, 从事油气成藏地球化学及含烃流体地质学研究。E-mail: xiongwl@cnooc.com.cn

中图分类号: TE122.11
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- 文章访问数: 467
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-21
- 修回日期: 2021-02-21
- 刊出日期: 2021-03-28

Origin and mixing ratio of crude oils in different charging episodes of Yangjiang Sag of Pearl River Mouth Basin

1.
CNOOC China Limited, Shenzhen Branch, Shenzhen, Guangdong 518054, China
2.
School of Geosciences, Yangtze University, Wuhan, Hubei 432100, China

摘要

摘要: 阳江凹陷为珠江口盆地近两年来获得油气勘探重大突破的新区。采用饱和烃色谱—质谱实验、流体包裹体系统分析和全油气相色谱法混源油定量配比实验相结合，对阳江凹陷不同成藏期次原油成因进行系统分析，并对已获得混源油藏的混源比例进行了测算。阳江凹陷发生两期原油充注，充注时间分别为12.0~7.5 Ma和6.5~0 Ma。第一期原油来源于恩平20洼始新统文昌组文三段中浅湖相烃源岩，主要在中新统珠江组储层中聚集成藏；第二期原油来源于文一段和文二段中深湖相烃源岩，在中新统珠江组—韩江组储层中均有成藏。通过混源油定量配比实验建立混源比例测算模板，计算结果表明，B20-1、B20-2油田韩江组油藏均为第二期充注，B20-1油田珠江组油藏第一期和第二期充注量占比分别为39%和61%。关键成藏时期断裂活动强度、圈闭发育层段及有效烃源岩三者耦合关系共同控制着圈闭富集程度。
- 配比实验 /
- 油气成因 /
- 原油充注时期 /
- 混源比例定量计算 /
- 阳江凹陷 /
- 珠江口盆地
Abstract: The oil and gas exploration in the Yangjiang Sag of Pearl River Mouth Basin has successfully carried out and breakthroughs have been achieved in the past two years. The generation mechanisms of crude oils of multiple charging episodes were studied and the sources, mixing ratios were quantitatively calculated by the using of analytical results of gas chromatography-mass spectrometry (GC-MS) for the saturated hydrocarbon fractions, fluid inclusion system analysis and whole-oil gas chromatography (GC-FID) for mixed-source oil proportion experiment. Results showed that there were two episodes of crude oil charging in the Yangjiang Sag, 12.0-7.5 Ma and 6.5-0 Ma. In the first stage, crude oils came from the medium-shallow deposited lacustrine source rocks in the third member of Wenchang Formation in the Enping 20 sub-sag, and mainly were accumulated in the Zhujiang Formation. In the second stage, crude oil came from the medium-deep deposited lacustrine source rocks of the first and second members of Wenchang Formation, and accumulated in the Zhujiang and Hanjiang formations. A template for the calculation of mixed propotion of oils was established through quantitative experiments. It was concluded that the Hanjiang reservoirs in the B20-1 and B20-2 oil fields were mainly charged during the second episode, while the Zhujiang reservoirs in the B20-1 oil field were charged during both the first and the second episodes, accounting for 39% and 61%, respectively. The coupling relationship among fault activity intensity, trap development interval and effective source rock controlled the degree of enrichment.
- proportioning experiment /
- crude oil origin /
- crude oil charging history /
- quantitative calculation of mixed-source proportion /
- Yangjiang Sag /
- Pearl River Mouth Basin

HTML全文

图 1 珠江口盆地阳江凹陷构造单元及地层划分

Figure 1. Tectonic units and stratigraphic column of Yangjiang Sag, Pearl River Mouth Basin

下载: 全尺寸图片幻灯片

图 2 珠江口盆地阳江凹陷以及珠一坳陷文昌组、恩平组泥岩生烃潜力评价

Figure 2. Hydrocarbon generation potential evaluation of mudstones in Wenchang and Enping formations, Yangjiang Sag and Zhu Ⅰ Depression, Pearl River Mouth Basin

下载: 全尺寸图片幻灯片

图 3 珠江口盆地阳江凹陷以及珠一坳陷典型原油及烃源岩生物标志化合物特征

C₂₇.20R-5α(H), 14α(H), 17α(H)-胆甾烷；C₂₈.20R-24-甲基-5α(H), 14α(H), 17α(H)-胆甾烷；C₂₉.20R-24-乙基-5α(H), 14α(H), 17α(H)-胆甾烷；Ts.18α(H)-22, 29, 30-三降藿烷；Tm.17α(H)-22, 29, 30-三降藿烷；C₃₀Dia-H.C₃₀-重排藿烷；OL.奥利烷；C₃₀H.17α(H), 21β(H)-藿烷；T.树脂化合物T

Figure 3. Typical biomarker distributions of crude oils and source rocks in Yangjiang Sag and Zhu Ⅰ Depression, Pearl River Mouth Basin

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图 4 珠江口盆地阳江凹陷以及珠一坳陷典型原油及烃源岩生物标志化合物参数关系

Figure 4. Relationship between typical biomarkers of crude oil and source rocks in Yangjiang Sag and Zhu Ⅰ Depression, Pearl River Mouth Basin

下载: 全尺寸图片幻灯片

图 5 珠江口盆地阳江凹陷油气包裹体特征

TR表示偏光，UV表示荧光，×10表示显微镜物镜放大倍数
a-b.B20-1，1 761.2 m，切穿石英颗粒成岩裂纹中检测到大量发黄绿色荧光油包裹体；c-d.B20-1，1 541.4 m，石英颗粒内裂纹中检测到大量发蓝绿色荧光油包裹体，粒间孔隙中检测到大量发黄绿色荧光油浸染；e-f.B20-1，2 080.0 m，石英颗粒粒间孔隙及微裂隙中检测到大量褐色沥青；g-h.B20-1，2 308.0 m，早期基底式方解石胶结物中可见发蓝绿色荧光单一液相油包裹体，石英颗粒内裂纹中检测到大量发蓝绿色荧光油包裹体，粒间孔隙中检测到大量发蓝绿色荧光油浸染

Figure 5. Characteristics of oil and gas inclusions in Yangjiang Sag, Pearl River Mouth Basin

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图 6 珠江口盆地阳江凹陷B20-1井储层样品盐水包裹体均一温度直方图

Figure 6. Homogeneous temperature diagram of the aqueous inclusions in reservoir samples of well B20-1, Yangjiang Sag, Pearl River Mouth Basin

下载: 全尺寸图片幻灯片

图 7 珠江口盆地阳江凹陷油包裹体充注期次及时间

Figure 7. Charging episodes and time of oil inclusions in Yangjiang Sag, Pearl River Mouth Basin

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图 8 珠江口盆地配比混合油样品全油气相色谱图

Figure 8. Whole-oil gas chromatograms of mixed oil samples of Pearl River Mouth Basin

下载: 全尺寸图片幻灯片

图 9 珠江口盆地两期成藏原油充注比率定量测算图版

Figure 9. Quantitative calculation chart of filling proportion of two-stage reservoir forming crude oil of Pearl River Mouth Basin

下载: 全尺寸图片幻灯片

图 10 珠江口盆地阳江凹陷B20-1和B20-2油田各油藏两期原油贡献比例

Figure 10. Contribution ratio of two phases of crude oils in B20-1 and B20-2 oil fields in Yangjiang Sag, Pearl River Mouth Basin

下载: 全尺寸图片幻灯片

图 11 珠江口盆地阳江凹陷第一期原油成藏模式

Figure 11. Oil accumulation model of the first episode in Yangjiang Sag, Pearl River Mouth Basin

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图 12 珠江口盆地阳江凹陷第二期原油成藏模式

Figure 12. Oil accumulation model of the second episode in Yangjiang Sag, Pearl River Mouth Basin

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表 1 珠江口盆地阳江凹陷B20-1井与油包裹体同期盐水包裹体均一温度及充注时间数据

Table 1. Homogenization temperatures of aqueous inclusions accompanied with oil inclusions and charging time in well B20-1 of Yangjiang Sag, Pearl River Mouth Basin

深度/m	层位	样品个数	盐水包裹体均一温度/℃	产状	时间/Ma	共生类型
1 541.4	韩江组	8	59.6~66.5	石英颗粒成岩裂纹	6.7~4.4	油包裹体(黄绿色)
1 627.0	韩江组	9	66.3~71.5	石英颗粒成岩裂纹	5.2~3.0	油包裹体(黄绿色)
1 761.2	珠江组	12	65.6/79.6~91.6	石英颗粒成岩裂纹	7.5/2.4~0	油包裹体(黄绿+蓝绿色)
1 870.7	珠江组	7	73.1~85.1	石英颗粒成岩裂纹	5.8~0	油包裹体(黄绿色)
2 080.0	珠江组	14	60/85.5~93.3	石英颗粒成岩裂纹	12.0/3.5~0	油包裹体(黄绿+蓝绿色)
2 162.0	珠江组	9	88.3~96.6	石英颗粒成岩裂纹	3.0~0	油包裹体(黄绿色)
2 308.0	珠江组	10	86.7~97.7	石英颗粒成岩裂纹	6.1~0	油包裹体(黄绿色)
2 380.0	珠江组	5	92.8~103.5	石英颗粒成岩裂纹	4.3~0	油包裹体(黄绿色)
注：样品个数表示与油包裹体共生的盐水包裹体均一温度数据点个数。

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