渤海湾盆地沾化凹陷湖相泥页岩地球化学特征及有机质富集规律

曹婷婷; 姚威; 李志明; 李政; 黎茂稳

doi:10.11781/sysydz202004558

渤海湾盆地沾化凹陷湖相泥页岩地球化学特征及有机质富集规律

doi: 10.11781/sysydz202004558

曹婷婷^{1, 2, 3, 4,},
姚威^{1, 2, 3, 4},
李志明^{1, 2, 3, 4},
李政⁵,
黎茂稳^{1, 2, 3, 4}

1.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
2.
页岩油气富集机理与有效开发国家重点实验室, 江苏无锡 214126
3.
国家能源页岩油研发中心, 江苏无锡 214126
4.
中国石化油气成藏重点实验室, 江苏无锡 214126
5.
中国石化胜利油田分公司勘探开发研究院, 山东东营 257000

基金项目:

国家科技重大专项 2017ZX05049001-001

详细信息

作者简介:
曹婷婷(1986-), 女, 高级工程师, 从事页岩油勘探研究。E-mail: ctt.syky@sinopec.com

中图分类号: TE122.1
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- 被引次数: 0
出版历程
- 收稿日期: 2020-01-06
- 修回日期: 2020-06-09
- 刊出日期: 2020-07-28

Geochemical characteristics of lacustrine shale and enrichment mechanism of organic matter in Zhanhua Sag, Bohai Bay Basin

CAO Tingting^{1, 2, 3, 4
,},
YAO Wei^{1, 2, 3, 4},
LI Zhiming^{1, 2, 3, 4},
LI Zheng⁵,
LI Maowen^{1, 2, 3, 4}

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2.
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu 214126, China
3.
State Energy Center for Shale Oil Research and Development, Wuxi, Jiangsu 214126, China
4.
Key Laboratory of Hydrocarbon Accumulation Mechanism, SINOPEC, Wuxi, Jiangsu 214126, China
5.
Research Institute of Exploration and Development, SINOPEC Shengli Oilfield, Dongying, Shandong 257000, China

摘要

摘要: 以渤海湾盆地沾化凹陷罗69井沙三下亚段湖相泥页岩为研究对象，在层序地层框架下，研究了不同体系域湖相泥页岩的地球化学特征，阐明了沉积环境的演化过程及有机质富集规律，为非常规页岩油有利目标的识别提供理论支持。测井与岩性组合揭示沙三下亚段层序自下而上分为湖侵体系域、早期高位体系域和晚期高位体系域。生产力和保存条件是有机质富集的控制因素，二者缺一不可。较高的生产力和较好的保存条件共同决定了早期高位体系域最有利于有机质富集，也为其成为良好的页岩油开发层系提供了良好的物质基础。
- 湖相泥页岩 /
- 层序 /
- 地球化学特征 /
- 有机质富集 /
- 沾化凹陷 /
- 渤海湾盆地
Abstract: The lacustrine shale in the lower part of the third member of Shahejie Formation (Es₃) in well L69 in the Zhanhua Sag of Bohai Bay Basin was studied. The geochemical characteristics of lacustrine shale in different system tracts were analyzed in a framework of sequence stratigraphy. The evolution process of sedimentary environment and the enrichment mechanism of organic matter were clarified, which provided theoretical support for the identification of favorable targets of unconventional shale oil. The combination of logging and lithology reveals that the sequence of the lower Es³ can be divided into transgression, early highstand and late highstand system tracts from bottom to top. Productivity and preservation conditions are the controlling factors of organic matter enrichment. The higher productivity and better preservation conditions together determine that the early highstand system tract is the most favorable organic matter accumulation interval, which provides a good material basis for a good shale oil development target.
- lacustrine shale /
- sequence /
- geochemical characteristics /
- enrichment of organic matter /
- Zhanhua Sag /
- Bohai Bay Basin

HTML全文

图 1 渤海湾盆地沾化凹陷罗69井沙三下亚段层序地层柱状图

Figure 1. Sequence stratigraphic column of lower Es₃ in well L69, Zhanhua Sag, Bohai Bay Basin

下载: 全尺寸图片幻灯片

图 2 渤海湾盆地沾化凹陷罗69井取心层段TOC与岩石热解参数分布特征

Figure 2. Distribution characteristics of TOC and rock pyrolysis parameters in coring sections in well L69, Zhanhua Sag, Bohai Bay Basin

下载: 全尺寸图片幻灯片

图 3 渤海湾盆地沾化凹陷罗69井沙三下段典型样品中甾、萜类化合物分布特征

Figure 3. Distribution of sterane (m/z=217) and terpane (m/z=191) compounds in typical samples from lower Es₃ in well L69, Zhanhua Sag, Bohai Bay Basin

下载: 全尺寸图片幻灯片

图 4 渤海湾盆地沾化凹陷罗69井沙三下亚段岩心样品中无机元素分布特征

Figure 4. Mineral element distribution in cores from lower Es₃ in well L69, Zhanhua Sag, Bohai Bay Basin

下载: 全尺寸图片幻灯片

图 5 渤海湾盆地沾化凹陷罗69井沙三下亚段体系域中古水体介质参数分布

Figure 5. Distribution of paleo-water parameters in system tracts of lower Es₃ in well L69, Zhanhua Sag, Bohai Bay Basin

下载: 全尺寸图片幻灯片

表 1 渤海湾盆地沾化凹陷罗69井沙三下亚段不同体系域的分子地球化学参数

Table 1. Molecular geochemical parameters of lower Es₃ in well L69, Zhanhua Sag, Bohai Bay Basin

深度/m	主峰碳	OEP	CPI	∑C_21-/∑C₂₂₊	Pr/Ph	体系域
2 930~2 990	C₂₃-C₂₅	$\frac{1.14 \sim 1.67}{1.45}$	$\frac{1.03 \sim 1.45}{1.28}$	$\frac{0.42 \sim 0.62}{0.53}$	$\frac{1.08 \sim 1.79}{1.39}$	晚期高位体系域
2 990~3 040	C₁₇-C₁₈，C₂₅	$\frac{0.77 \sim 0.81}{0.79}$	$\frac{0.64 \sim 0.73}{0.70}$	$\frac{0.62 \sim 1.22}{0.84}$	$\frac{0.46 \sim 0.54}{0.50}$	早期高位体系域
3 040~3 140	C₁₆-C₁₈	$\frac{0.84 \sim 0.90}{0.86}$	$\frac{0.68 \sim 0.78}{0.72}$	$\frac{0.34 \sim 1.10}{0.83}$	$\frac{0.36 \sim 0.53}{0.44}$	湖侵体系域
注：表中分式的意义为$\frac{\text { 最小值} \sim \text {最大值 }}{\text { 平均值 }}$。

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