北塘凹陷古近系烃源岩特征及热演化史模拟

白云风; 王华; 王振升; 廖远涛; 林正良; 黄传炎

doi:10.3799/dqkx.2011.057

北塘凹陷古近系烃源岩特征及热演化史模拟

doi: 10.3799/dqkx.2011.057

白云风^{1, 2,},
王华³,
王振升⁴,
廖远涛³,
林正良³,
黄传炎³

1.
吉林大学地球科学学院, 吉林长春 130061
2.
大庆油田有限责任公司勘探开发研究院, 黑龙江大庆 163712
3.
中国地质大学资源学院, 湖北武汉 430074
4.
大港油田有限责任公司勘探开发研究院, 天津大港 300280

基金项目:

湖北省杰出青年基金 2003ABB012

详细信息

作者简介:
白云风(1977-), 男, 博士后, 主要从事沉积盆地分析方面研究.E-mail: byf198407@163.com

中图分类号: TE135
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出版历程
- 收稿日期: 2010-12-28
- 刊出日期: 2011-05-01

Thermal Evolution Modeling and Characteristic of Source Rock of Paleogene in Beitang Sag

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
E & D Research Institute of Daqing Oilfield Company Ltd., Daqing 163712, China
3.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
4.
E & D Research Institute of Dagang Oilfield Company Ltd., CNPC, Dagang 300280, China

摘要

摘要: 根据大量的烃源岩地球化学数据, 分析了北塘凹陷古近系烃源岩的地球化学特征, 从有机碳含量(TOC)、氯仿沥青"A"、总烃含量、S₁+S₂、有机质类型和成熟度(R_o)等方面对古近系烃源岩进行了系统分析, 结果表明北塘凹陷东三段、沙一段和沙三段是本区的烃源岩层段, 其中沙三段烃源岩生烃指标最好, 是本区的主力烃源岩层段.烃源岩的模拟结果表明: (1)北塘凹陷的烃源岩门限深度为2 390 m, 门限温度为94.2℃, 进入生烃门限的时间约为25~28 Ma; (2)北塘凹陷沙三段的现今地层温度为140~160℃, R_o达0.9%~1.4%, 正处于生油高峰期; 沙一、二段的现今地层温度为100~140℃, R_o达到了0.75%~1.0%左右, 已进入中等成熟阶段; 东营组的现今地层温度为80~100℃, R_o为0.45%~0.75%, 处于低-中等成熟阶段.
- 北塘凹陷 /
- 古近系 /
- 烃源岩 /
- 热演化史模拟 /
- 沉积学
Abstract: Based on large quantity of organic geochemistry data, the geochemistry characteristics are systematically analyzed on organic carbonate content (TOC), chloroform bitumen "A", overall hydrocarbon content, S₁+S₂, organic matter types and maturity (R_o%) and so on. It shows that the Dong 3 Member, Sha 1 Member and Sha 3 Member are the main oil source beds of Beitang sag, especially, Sha 3 Member is the best in source rock quality. The model results indicate that (1) The depth of oil generative threshold is about 2 390 m, and the temperature is about 94.2℃, and the time entering on the oil generative threshold is from 25 Ma to 28 Ma in Beitang sag; (2) The present-day temperature of Sha 3 Layer is 140-160℃, the present-day R_o ranges between 0.9%-1.4%, It is in its peak of oil generation. The temperature of Sha 1+2 Layer is 100-140℃, the R_o ranged between 0.75%-1.0%, which suggests that it is in the middle-maturity at present. The present-day temperature of Dongying Layer is 80-100℃, the present-day R_o ranges between 0.45%-0.75%, which indicates that the present-day source rocks are in low maturation.
- Beitang sag /
- Paleogene /
- source rock /
- thermal evolution history modeling /
- sedimentology

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图 1 北塘凹陷构造位置

Fig. 1. Tectonic location map of Beitang sag

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图 2 北塘凹陷古近系典型井干酪根类型统计结果

Fig. 2. Type of kerogens of Paleogene in Beitang sag

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图 3 北塘凹陷古近系岩石热解干酪根类型判别

Fig. 3. Hierarchy of the Q-mode cluster analysis of the heavy minerals in Dongying Formation in Huanghua depression

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图 4 北塘凹陷GH3-1井埋藏史与热演化特征

Fig. 4. Burial history and temperature evolution of Well GH3-1 in Beitang sag

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图 5 北塘凹陷GH3-1井埋藏史与有机质成熟度演化

Fig. 5. Burial history and organic maturity evolution of Well GH3-1 in Beitang sag

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图 6 北塘凹陷2测线模拟温度剖面(a)和成熟度剖面(b)

Fig. 6. Modeling temperature section (a) and maturity section (b) of line 2 in Beitang sag

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表 1 北塘凹陷古近系有机质丰度统计

Table 1. Abundance of organic of Paleogene in Beitang sag

层位	有机碳 (TOC, %)	氯仿沥青“A” (EOM, %)	总烃 (10^-6)	生烃潜量 (S₁+S₂, mg/g)
Ed₃	$\frac{\text{0}\text{.52}\sim \text{1}\text{.03}}{\text{0}\text{.64(58)}}$	$\frac{\text{0}\text{.006}\sim \text{0}\text{.192}}{\text{0}\text{.023(15)}}$	$\frac{\text{55}\sim \text{151}}{\text{79(10)}}$	$\frac{\text{0}\text{.32}\sim \text{5}\text{.96}}{\text{2}\text{.91(8)}}$
Es₁	$\frac{\text{0}\text{.64}\sim \text{1}\text{.22}}{\text{0}\text{.79(78)}}$	$\frac{\text{0}\text{.008}\sim \text{0}\text{.242}}{\text{0}\text{.032(8)}}$	$\frac{\text{75}\sim \text{224}}{\text{141(6)}}$	$\frac{\text{1}\text{.45}\sim \text{9}\text{.61}}{\text{4}\text{.42(6)}}$
Es₃¹	$\frac{\text{0}\text{.63}\sim \text{2}\text{.65}}{\text{1}\text{.17(246)}}$	$\frac{\text{0}\text{.018}\sim \text{0}\text{.331}}{\text{0}\text{.062(58)}} $	$\frac{\text{175}\sim \text{325}}{\text{271(33)}}$	$\frac{\text{2}\text{.22}\sim \text{13}\text{.24}}{\text{5}\text{.33(150)}}$
Es₃²	$\frac{\text{0}\text{.74}\sim \text{2}\text{.01}}{\text{1}\text{.23(147)}}$	$\frac{\text{0}\text{.014}\sim \text{0}\text{.412}}{\text{0}\text{.112(57)}}$	$\frac{\text{478}\sim \text{1 032}}{\text{609(19)}}$	$\frac{\text{2}\text{.41}\sim \text{15}\text{.29}}{\text{6}\text{.59(112)}}$
Es₃³	$\frac{\text{0}\text{.70}\sim \text{9}\text{.73}}{\text{1}\text{.11(18)}}$	$\frac{\text{0}\text{.023}\sim \text{0}\text{.302}}{\text{0}\text{.076(9)}}$	$\frac{\text{152}\sim \text{778}}{\text{394(5)}}$	$\frac{\text{1}\text{.52}\sim \text{9}\text{.77}}{\text{6}\text{.32(205)}}$
注：(1)表格中的数据含义$\frac{最小值\sim 最大值}{平均值(样品数)}$；(2)东三段和沙一段数据为1999年所测数据^①，沙三1段、沙三2段、沙三3段三组数据中增加了2005年以来所测的数据.

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