GEOCHEMISTRY AND SOURCE ANALYSIS OF OIL FROM SHA3 FORMATION IN SOUTHERN BEACH SEA AREA, DAGANG OILFIELD
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摘要: 大港油田南部滩海区毗邻歧口和歧南两大生烃凹陷,具有双向供烃优势。沙三段是研究区最主要的产油层,但目前对该层段的油源对比结果尚存在争议。为明确油源,分别对原油的族组分、碳同位素、异戊二烯烃和甾萜类化合物等指标的地球化学特征进行分析对比,划分了原油类型。结果表明,南部滩海区沙三段原油可分为三类,第一类原油主要来自沙三段烃源岩,第二类原油主要来自沙一下段烃源岩,第三类原油地化特征介于两者之间,推测其为沙一下段与沙三段烃源岩的混合来源。三类原油在区域上也存在一定的分布规律。Abstract: Southern beach sea area in Dagang Oilfield is adjacent to Qikou and Qinan hydrocarbon generation sags, and has the advantage of bidirectional source. Sha3 Formation is the major pay bed in the studied area, but the oil-source correlation in this formation is still disputed. In order to clarify the oil source, some indexes and geochemical characteristics are analyzed and correlated, such as group composition, carbon isotopes, i-paraffins, steroids and terpenoids, and oil is classified. The result shows that the oil in Sha3 Formation of southern beach sea area can be classified into 3 types. Type Ⅰ is mainly derived from the source rock in Sha3 Formation, type Ⅱ mainly from the source rock in Lower Sha1 Formation, and type Ⅲ is the mixed source of Lower Sha1 and Sha3 since the geochemical characteristics are between the first two types. The distribution characteristics of these three types of oil are regionally different.
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Key words:
- oil /
- source rock /
- carbon isotope /
- biomarker /
- oil-source correlation
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