乌兰花凹陷原油特征及成因

冯伟平; 王飞宇; 王宗秀; 师玉雷; 江涛; 王予帆; 周洪峰

doi:10.12090/j.issn.1006-6616.2020.26.06.074

乌兰花凹陷原油特征及成因

doi: 10.12090/j.issn.1006-6616.2020.26.06.074

冯伟平^{1, 2, 3, 4,},
王飞宇^4, ,,
王宗秀^{1, 2, 3},
师玉雷⁵,
江涛⁵,
王予帆⁶,
周洪峰⁶

1.
中国地质科学院地质力学研究所, 北京 100081
2.
中国地质调查局油气地质力学重点实验室, 北京 100081
3.
自然资源部古地磁与古构造重建重点实验室, 北京 100081
4.
中国石油大学 (北京) 地球科学学院, 北京 102249
5.
中国石油华北油田分公司勘探开发研究院, 河北任丘 062552
6.
中国石油华北油田分公司二连分公司, 内蒙古锡林浩特 026000

基金项目:

中国地质调查局地质调查项目 DD20190085

国家油气重大专项 2016ZX05007001-003

中国石油华北油田公司合作课题 HBYT-YJY-2017-JS-152

详细信息

作者简介:
冯伟平(1987-), 男, 博士后, 从事石油地质学研究工作。E-mail:fengwp1232@163.com

通讯作者:
王飞宇(1963-), 男, 教授, 主要从事石油地质学方面的教学和科研作用。E-mail:fywang@cup.edu.cn

中图分类号: TE122.1
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- 文章访问数: 539
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- 被引次数: 0
出版历程
- 收稿日期: 2020-08-08
- 修回日期: 2020-10-11
- 刊出日期: 2020-12-01

Characteristics and origin of crude oils in the Wulanhua sag

FENG Weiping^{1, 2, 3, 4
,},
WANG Feiyu^{4
, ,},
WANG Zongxiu^{1, 2, 3},
SHI Yulei⁵,
JIANG Tao⁵,
WANG Yufan⁶,
ZHOU Hongfeng⁶

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Key Laboratory of Petroleum Geomechanics, China Geological Survey, Beijing 100081, China
3.
Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Natural Resources, Beijing 100081, China
4.
College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
5.
Research Institute of Exploration and Development, Huabei Oilfield Company, PetroChina, Renqiu 062552, Hebei, China
6.
Erlian Company, Huabei Oilfield Company, PetroChina, Xilinhaote 026000, Inner Mongolia, China

摘要

摘要: 乌兰花凹陷是二连盆地南部新发现的富油凹陷，对乌兰花凹陷原油物理性质和地球化学性质进行了系统的分析以揭示其特征及来源。原油物理性质显示，乌兰花凹陷原油比重（API gravity）介于20.2°~40.0°之间，主体为正常原油。原油生物标志化合物参数表明，不同构造带之间原油特征存在差异，可以划分为两类原油。一类以土牧尔构造带原油为主，具有低姥值比（Pr/Ph）和C₂₁/C₂₃三环萜烷，相对较高的伽马蜡烷/C₃₁藿烷和规则甾烷/C₃₀藿烷的特征，原油主要为烃源岩在成熟阶段早期的产物，主要以藻类来源为主。另一类原油包括赛乌苏和红井构造带原油，具有高姥值比（Pr/Ph）和C₂₁/C₂₃三环萜烷，相对较低的伽马蜡烷/C₃₁藿烷和规则甾烷/C₃₀藿烷，主要为陆源有机质和藻类有机质混合来源，原油具有更高的成熟度。原油碳同位素和正构烷烃单体烃碳同位素表明这两类原油应是一套烃源岩在不同成熟阶段的产物，原油主要来源于南洼槽阿尔善组烃源岩。阿尔善组烃源岩的非均质性和成熟度导致了两类原油的差异。
- 乌兰花凹陷 /
- 二连盆地 /
- 原油 /
- 地球化学特征 /
- 碳同位素
Abstract: The Wulanhua sag is a newly discovered oil-rich sag in the Erlian basin. The physical and geochemical properties of crude oils in the Wulanhua sag were systematically analyzed to reveal the characteristics and origins. The physical properties of crude oils suggest that the API gravities range from 20.2° to 40.0°, and most are normal crude oil. The biomarker parameters show considerable variation among the oils from different tectonic units, which can be separated into two crude oil families. Crude oil family-I is dominated by oils from the Tumuer tectonic unit, and characterized by low Pr/Ph and C₂₁/C₂₃ TT, and relatively high gammacerane/C₃₁ hopane and regular sterane/C₃₀ hopane. Crude oil family-I is mostly derived from the algal organic matter at low maturity levels. Crude oil family-Ⅱ consists of oils from the Saiwusu and Hongjing tectonic units, which is characterized by high Pr/Ph and C₂₁/C₂₃ TT, and relatively low gammacerane/C₃₁ hopane and regular sterane/C₃₀ hopane. Crude oil family-Ⅱ is mainly derived from the mixed algal and terrigenous organic matter at higher maturity levels. Carbon isotopic compositions of crude oil and individual n-alkanes indicate that these two crude oil families should be the products of the same set of source rocks at different maturity levels, and likely derived from the K₁ba source rock in the southern sub-sag. The factors controlling differences between the two crude oil families include the heterogeneous source rock and its maturation process.
- Wulanhua sag /
- Erlian basin /
- crude oil /
- geochemical characteristics /
- carbon isotope
注释:

责任编辑： 范二平

HTML全文

图 1 乌兰花凹陷构造单元及原油样品位置

图中不同形状的点区分不同构造带的原油，不同颜色区分原油的层位

Figure 1. Tectonic units and crude oil sample locations in the Wulanhua sag

下载: 全尺寸图片幻灯片

图 2 乌兰花凹陷原油API比重随深度的变化

Figure 2. API gravities vary with burial depth for crude oils in the Wulanhua sag

下载: 全尺寸图片幻灯片

图 3 乌兰花凹陷原油API比重与胶质+沥青质的关系

Figure 3. Relationship between API gravity and Rein plus Aphletene content for crude oils in the Wulanhua sag

下载: 全尺寸图片幻灯片

图 4 乌兰花凹陷原油饱和烃气相色谱

Figure 4. Saturated hydrocarbon gas chromatography of crude oils in the Wulanhua sag

下载: 全尺寸图片幻灯片

图 5 乌兰花凹陷原油类异戊二烯烷烃与萜烷参数特征

a—Pr/Ph与伽马蜡烷/C₃₁藿烷的关系图；b—Ph/nC₁₈与Pr/nC₁₇关系图

Figure 5. Isoprenoids and Terpenes parameter characteristics for crude oils in the Wulanhua sag

下载: 全尺寸图片幻灯片

图 6 乌兰花凹陷原油生物标志化合物特征

Figure 6. Biomarker characteristics of crude oils in the Wulanhua Sag

下载: 全尺寸图片幻灯片

图 7 乌兰花凹陷C₂₁/C₂₃三环萜烷值与规则甾烷/C₃₀藿烷的关系

Figure 7. Relationship between C₂₁/C₂₃ tricyclic terpane and regular sterane/C₃₀ hopane for crude oils in the Wulanhua sag

下载: 全尺寸图片幻灯片

图 8 乌兰花凹陷原油C₂₉甾烷20S/(20S+20R)和αββ/(αββ+ααα)关系图

Figure 8. Relationship between C₂₉ sterane 20S/(20S+20R) and αββ/(αββ+ααα) for crude oils in the Wulanhua sag

下载: 全尺寸图片幻灯片

图 9 乌兰花凹陷典型原油饱和烃单体烃碳同位素

Figure 9. Carbon isotopic compositions of individual n-alkanes of typical crude oils in the Wulanhua sag

下载: 全尺寸图片幻灯片

表 1 乌兰花凹陷不同构造带原油物理性质

Table 1. Physical properties of crude oils from different tectonic units in the Wulanhua sag

构造带	层位	密度/ (g/cm³)	API/ (°)	黏度/ (mPa·s)	凝固点/ ℃	硫含量/ %	蜡含量/ %	胶质+沥青质含量/%
赛乌苏	K₁bt¹、K₁ba、Pz	0.8358~0.9330	20.2~37.8	11~49	31~53	0.05~0.69	20.5~30.8	10.5~32.6
土牧尔	K₁bt¹、K₁ba、Pz	0.8451~0.8731	30.6~35.9	13~71	28~35	0.19~0.65	23.2~25.6	18.4~25.5
红格尔	K₁bt¹、K₁ba、Pz	0.825~0.889	27.7~40.0	11~12.47	31~32	-	-	-
红井	K₁bt¹、K₁ba	0.836~0.888	27.8~37.8	30~171	34~35	0.12~0.14	24~25	22~31

下载: 导出CSV

表 2 乌兰花凹陷典型原油碳同位素

Table 2. Carbon isotope values for typical crude oils in the Wulanhua sag

构造带	井号	层位	δ¹³C/‰
赛乌苏	W4	K₁bt¹	-29.2
土牧尔	W5	K₁bt¹	-31.2
土牧尔	W6	K₁bt¹	-31.8

下载: 导出CSV

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