八面河地区原油、烃源岩中甾类化合物的分布特征及其应用

李素梅; 庞雄奇; 金之钧

八面河地区原油、烃源岩中甾类化合物的分布特征及其应用

石油大学盆地与油藏研究中心, 北京 102249

基金项目:

中国重大基础研究硕目 G199943310

详细信息

作者简介:
李素梅(1968-), 女, 博士, 主要从事有机地球化学研究

中图分类号: P618.130.1;TE122.1
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出版历程
- 收稿日期: 2002-08-12
- 刊出日期: 2002-11-25

Distribution and Significance of Steroids in Bamianhe Oilfield, East China

Basin & Reservoir Research Center, University of Petroleum, Beijing 102249, China

摘要

摘要: 对渤海湾盆地八面河地区31个分别形成于还原性咸化水体和淡水环境的页岩和泥岩样、20个油样中甾类化合物进行了剖析.结果表明该区烃源岩、原油中的甾类化合物异常丰富, 主要包括C_27-29规则甾烷、C_28-304-甲基甾烷、甲藻甾烷以及芳香甾类; 不同层段烃源岩中甾类化合物的分布各具特色, 发育于牛庄洼陷南斜坡咸化水体的富藻类沙四段页岩富含4-甲基甾烷及甲藻甾烷, 形成于淡水环境的沙三段泥岩中甲藻甾烷不太发育.烃源岩、原油中规则甾烷的分布型式明显有别于甲基甾烷, 指示两类化合物可能来源于不同的藻类属种.甾类化合物的分布特征受控于古环境、生物先质种类及热成熟度等多种因素.不同层段甾类化合物的特征性分布使其成为该区油源岩确认的关键指标.结果还表明, 甲基甾烷在油源岩识别中比规则甾烷具有更好的应用效果.依据甾类化合物, 可判断埋深超过2 700 m的Es4烃源岩与原油具有较好的相关性, 发育于牛洼洼陷南斜坡的未熟-低熟特殊烃源岩—富藻类页岩与原油没有可比性, 该结论是对近期油源调查结果的进一步确认.
- 湖相沉积 /
- 4-甲基甾烷 /
- 甲藻甾烷 /
- 低熟油 /
- 油源对比 /
- 八面河油田
Abstract: samples of shales and mudstones developed in reducing hypersaline and freshwater setting and 20 oil samples of Bamianhe oilfield, Bohai Bay basin were collected for a detailed study of petroleum system. Composition and distribution of specific significance of steroids were discussed as a part of the study. Abundant steroidal biomarkers including C_27-29 regular steranes, C_28-30 4-methyl steranes, dinosteranes and aromatic steranes were detected. The composition and distribution of the steroids in the samples studied were a function of thermal maturity, organic source, paleoenvironment and lithology of potential source rocks. Alga-rich Es₄ shales (brackish water) developed in the south slope of depocenter (Niuzhuang sag) were found particularly rich in steroidal biomarkers including C₃₀ 4-methyl steranes and dinosteranes. While Es₃ mudstones (fresh water) displayed devoid of dinosterane, abundant 4-β steranes were only found in argillaceous limestone and calcareous mudstone, clearly distinguished from the other rocks. Distribution patterns of regular steranes are different from methyl steranes completely indicating different origins of specific compound of the fraction. Isomerization of steroids were observed to be determined by paleoenvironment and lithology besides thermal maturity. Methyl steranes were proved much more useful in oil-source rock correlation than regular steranes. It was not possible that alga-rich Es₄ shales located on the south slope were the primary source rock responsible for the oil discovered based on composition and distribution of steroids.
- lacustrine sediment /
- 4-methyl sterane /
- dinosterane /
- immature oil /
- oil-source correlation /
- Bamianhe oilfield

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图 1 八面河油田地理位置与样品分布

Fig. 1. Location of Bamianhe oilfield and samples

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图 2 原油、烃源岩中甾类化合物丰度变化特征

Fig. 2. Absolute abundance of steroids in crude oils and rock extracts

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图 3 烃源岩甾类化合物异构化特征

Fig. 3. Isomerization of steroids in rock extracts

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图 4 C₂₉甾烷αββ20S/C₂₉ααα20R与埋深的关系

Fig. 4. C₂₉ steranes αββ20S/C₂₉ααα20R verse burial depth

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图 5 原油、烃源岩m/z231质量色谱

1.未定性化合物; 2, 3, 4.分别为C₂₈, C₂₉和C₃₀4α-甲基-ααα-20R甾烷; 5.C₃₀4β-甲基-ααα-20R甾烷

Fig. 5. m/z231 mass chromatograpy of crude oils and rock extracts

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图 6 油-岩聚类相关分析

Fig. 6. Oil-source rock correction using methyl steranes

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