Biomarker Characteristics of Source Rock and Oil-Correlation in Raoyang Depression, Jizhong Sub-Basin
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摘要: 饶阳凹陷北部油气资源丰富、圈闭类型多样，但其原油成因类型和来源尚不明确.利用烃源岩和原油生物标志物参数特征，有效区分3套烃源岩并通过聚类分析法划分原油成因类型，建立油岩关系并探讨各类型原油分布特征.研究表明：3套烃源岩在8组生标参数上表现出明显差异.饶阳北部地区发现的原油可划分为4种类型，包括沙三型、沙三和沙一下混合型、沙一下和沙三上混合型、沙一下型.3套烃源岩的生物标志物差异反映了它们具有不同的母质类型和沉积环境.沙三型分布在任丘潜山北部任北斜坡；沙三和沙一下混合型原油分布在马西洼槽中南部；沙一下和沙三上混合型分布在马西洼槽南边的八里庄油田；沙一下型分布在研究区西部蠡县斜坡上的高阳油田.这种分布特征主要是受到源岩分布和热演化程度的控制.Abstract: Raoyang depression has rich oil and gas reserves and varieties of trap types. However, we have a poor understanding of the oil genetic types and sources. By using the biomarker parameter characteristics of source rocks and crude oils, through hierarchical cluster analysis (HCA), we divided the origin genetic type of the oils, setup the oil-rock relationship and discussed the distribution characteristics of various types of oils in this study. The results show that three sets of source rocks display obvious differences in biomarkers, with each presenting different characteristics of biomarker parameter assemblage. The oil discovered in the northern part of Raoyang depression can be identified into 4 types, which include Es3 type, mixed type derived from Es3 and Es1L, mixed type derived from Es1L and Es3U, and Es1L type. The differences on biomarker assemblages among the potential source rocks indicate that they had different parent materials and formed in different sedimentary environments. The crude oils of Es3 type are distributed in Renbei slope in the north of the Renqiu buried hill. The crude oils of Es3 and Es1L type are distributed in the south central region of the Maxi sag. The crude oils of Es1L and Es3U type are distributed in the Balizhuang oil field on the north of the Maxi sag. The crude oils of Es1L type are distributed in the Lixian slope in the west of study area. Each type of oil has its own distribution characteristics, and it is mainly controlled by the areal distribution and the thermal evolution condition of local source rock.
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Key words:
- Raoyang depression /
- biomarker /
- oil-source correlation /
- genetic type /
- petroleum geology
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图 1 饶阳凹陷北部地区主要构造单元、油气田分布
Fig. 1. Tectonic units and location of oil fields of the northern part of Raoyang depression
图 2 饶阳凹陷北部地区3套源岩典型质谱图
G为伽马蜡烷; H为藿烷；C27-C29为C27-C29甾烷
Fig. 2. Representative mass chromatograms of saturate fractions for different source rocks in the northern part of Raoyang depression
图 3 饶阳凹陷北部地区烃源岩生物标志物参数分布
Fig. 3. Biomarker parameters and their relationships of source rocks in the northern part of Raoyang depression
图 4 饶阳凹陷北部地区原油性质剖面
Fig. 4. Variation of oil characteristics with depth in the northern part of Raoyang depression
图 5 饶阳凹陷北部地区4类原油典型质谱图
Fig. 5. Representative mass chromatograms of saturate fractions for Class1 oil, Class2 oil, Class3 oil and Class4 oil in the northern part of Raoyang depression
图 6 饶阳凹陷北部油田原油聚类分析
Fig. 6. Hierarchical cluster analysis (HCA) results showing crude oil classes for the oil fields in the northern part of Raoyang depression
图 7 饶阳凹陷北部各类型原油平面分布
Fig. 7. Geographic distribution of oils originated from different source rocks in the northern part of Raoyang depression
图 8 饶阳凹陷北部地区原油成因类型划分
Fig. 8. Division of crude oil genetic tapes in the northern part of Raoyang depression
图 9 饶阳凹陷北部地区第三系油藏不同成因类型原油的分布
Fig. 9. Geographic distribution of oils in Tertiary reservoirs originated from different source rocks in the northern part of Raoyang depression
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