渤南洼陷不同来源原油分布规律及主要控制因素

韩金虎; 郭小文; 王学军; 王永诗; 何生

doi:10.19509/j.cnki.dzkq.2020.0607

渤南洼陷不同来源原油分布规律及主要控制因素

doi: 10.19509/j.cnki.dzkq.2020.0607

基金项目:

"十三五"国家科技重大专项 2016ZX05006-003-001

详细信息

作者简介:
韩金虎(1995-), 男, 现正攻读地质工程专业硕士学位, 主要从事油气地球化学研究工作。E-mail:hjh1027@126.com

通讯作者:
郭小文(1980-), 男, 教授, 主要从事油气地质与油气成藏机理研究。E-mail:cuggxw@163.com

中图分类号: P588.12
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出版历程
- 收稿日期: 2020-02-27

Distribution rule and main controlling factors of crude oil from different sources in Bonan Sag

摘要

摘要: 为揭示渤南洼陷沙三段、沙四段烃源岩来源原油的分布规律及主要控制因素，通过族组分分离、气相色谱（GC）、气相色谱-质谱（GC-MS）等测试分析原油和烃源岩地球化学特征，进行原油成因分类，确定不同来源原油的分布规律，进而探讨影响油气分布的主要因素。研究表明，沙三段、沙四段烃源岩对原油的贡献程度不同。依据生物标志化合物指标将原油划分为Ⅰ、Ⅱ、Ⅲ 3类，其中Ⅱ类油细分为Ⅱ₁和Ⅱ₂ 2个亚类。油源对比结果表明：Ⅰ类油来源于沙三段烃源岩，主要分布在洼陷中心；Ⅱ₁类油来源于沙四段膏岩层间的泥岩，Ⅱ₂类油来源于沙四段盐层下部的泥岩，此类油主要分布在洼陷边缘部位；Ⅲ类油为混合来源，且以沙三源为主，其分布与断层的展布有关。结合洼陷地质特征分析，认为断层及沙四段上部存在的膏盐岩是影响不同来源原油分布的主要因素。
- 生物标志化合物 /
- 油源对比 /
- 原油分布 /
- 控制因素 /
- 渤南洼陷
Abstract: In order to reveal the distribution rule and main controlling factors of crude oil from the Es₃ and Es₄ source rocks in Bonan Sag, group separation, gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) and other means were used to analyze the geochemical characteristics of crude oil and source rock, carry out the genetic classification of crude oil, determine the distribution rule of crude oil from different sources, and then explore the main factors of oil distribution.The results show that the contribution of source rocks in Es₃ and Es₄ intervals to crude oil is different.Based on the biomarker parameters, crude oil is classified into three groups (Ⅰ, Ⅱ and Ⅲ), of which group Ⅱ oil is subdivided into group Ⅱ₁ and group Ⅱ₂ oil. Oil-source correlation suggests that group Ⅰ oil originates from the Es₃ source rock; group Ⅱ₁ oil is derived from mudstone interlayer between the gypsum rock of the Es₄ interval, group Ⅱ₂ oil is from mudstone of the lower part of gypsum layer of the Es₄ interval; group Ⅲ oil is from mixed source rocks in both of the Es₃ and Es₄ intervals, mainly from Es₃ source rocks, and its distribution is related to faults.Combined with the analysis of geological features of Bonan Sag, it is considered that fault and gypsum salt rocks of the upper Es₄ interval are the main factors affecting the distribution of crude oil from different sources.
- biomarkers /
- oil-source correlation /
- oil distribution /
- controlling factors /
- Bonan Sag

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图 1 沾化凹陷构造位置(a)及渤南洼陷构造单元图(b)

Figure 1. Structural location of Zhanhua Depression (a) and structural unit map of Bonan Sag (b)

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图 2 渤南洼陷烃源岩有机质类型(a，b)与成熟度相关图(c)

Figure 2. Plots of organic matter types (a, b) and vitrinite reflectance (c) of source rocks in Bonan Sag

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图 3 渤南洼陷烃源岩w(TOC)及HI分布直方图

Figure 3. Distribution histogram of TOC (a) and HI (b) of source rocks in Bonan Sag

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图 4 渤南洼陷沙三段、沙四段典型原油饱和烃组分气相色谱图

Figure 4. Gas chromatographic diagram of typical saturated hydrocarbon components of crude oil in the Es₃ and Es₄ intervals of Bonan Sag

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图 5 渤南洼陷沙三段、沙四段典型原油饱和烃质谱图

萜烷m/z=191;甾烷m/z=217; Ts.C₂₇ 18α-三降藿烷; Tm.C₂₇ 17α-三降藿烷; C₂₉.C₂₉藿烷; C₃₀.C₃₀藿烷; C₃₁~C₃₅.C₃₁~C₃₅升藿烷; Gam.伽马蜡烷; C₂₁ St.孕甾烷; C₂₂ St.升孕甾烷; C₂₇~C₂₉ St.C₂₇~C₂₉甾烷)

Figure 5. Saturated hydrocarbon mass spectrometry of typical crude oil in the Es₃ and Es₄ intervals of Bonan Sag

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图 6 C₂₉20S/(20S+20R)和C₂₉αββ/(ααα+αββ)相关图

Figure 6. Plot of C₂₉20S/(20S+20R) and C₂₉αββ/(ααα+αββ)

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图 7 渤南洼陷沙三段、沙四段典型烃源岩饱和烃质谱图(符号含义同图 5)

Figure 7. Saturated hydrocarbon mass spectrometry of typical source rocks in the Es₃ and Es₄ intervals of Bonan Sag

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图 8 渤南洼陷沙三段、沙四段原油及烃源岩生物标志物参数对比图

Figure 8. Comparison of crude oil and source rock biomarker parameters in the Es₃ and Es₄ intervals of Bonan Sag

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图 9 渤南洼陷不同油源井位及膏盐岩分布范围

Figure 9. Location of different oil source wells and distribution range of gypsum rocks in Bonan Sag

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图 10 渤南洼陷义171井-义160井剖面原油类型分布(剖面位置见图 1-b)

Ed.东营组；Es_1~4.沙一至四段；Es₃^s、Es₃^z、Es₃^x.沙三段上、中、下亚段

Figure 10. Distribution of crude oil types of profile Yi171-Yi160 wells in Bonan Sag

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