Evidence of Neogene Paleolake in the Central Beach Area of Dagang Oilfield
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摘要: 大港中部滩海新近系层系是重要的油气后备勘探领域和战略接替区.前人普遍认为新近系层系发育曲流河和辫状河沉积.借鉴渤海海域浅层油气勘探经验, 基于遗迹组构、微古生物、生物有机化合物、碳氧同位素以及地震等地质资料分析, 认为中部滩海东部发育开阔的古湖泊, 其证据为: 发育见于国内外浅湖环境的典型的Palaeophycus遗迹组构; 发现丰富的见于正常浅湖环境的浮游绿藻化石; 发现较多的仅分布在古代和现代湖泊中的介形类——Candona、Cypris; 干酪根类型、生物有机化合物、碳氧同位素以及地震等地质资料也证明了古湖泊的存在.馆陶组中、晚期至明化镇组沉积早期为湖泊逐渐扩张达到鼎盛发育的时期.Abstract: The Neogene strata of central beach area in the Dagang Oilfield are important for reserve exploration and strategic substitution.The main depositional system of Neogene was regarded as meandering rivers and braided rivers.However, based on the analysis of ichnofabric, microfossils, organic compounds, oxygen and carbon isotope, seismic data, as well as the experiences of petroleum exploration in the shallow strata of Bohai Bay, lacustrine environment can be recognized in the east district of central beach, which is supported by the following evidence: typical Palaeophycus ichnofabric is found, which develops particularly in the shallow lake; abundant phytoplanktonic algae fossils are discovered, which live generally in the shallow lake.Moreover, as an indicator of ancient and modern lakes' existence, lots of ostracodas such as Candona and Cypris are discovered.The type of kerogen, organic compounds, oxygen and carbon isotope, and seismic data are also the existent evidences of lacustrine environment.The paleolake expanded till its maximum during the middle and late periods of Guantao Formation and the early period of Minghuazhen Formation.
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Key words:
- paleolake /
- ichnofabric /
- Neogene /
- beach district /
- Dagang oilfield
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图 1 大港油田中部滩海新近系岩心遗迹组构特征
(a) Palaeophycus, G14井, 1 484.5 m; (b) Palaeophycus, QD1井, 1 790.5 m; (c) Skolithos, Zq13井, 1 186.5 m; (d) Planolites, G14井, 1 484.5 m; (e) Scoyenia, Q116井, 1 714.2 m; (f) 生物扰动构造, G29井, 1 739.0 m
Fig. 1. Characteristics of Neogene core ichnofabrics in the central beach area of Dagang Oilfield
图 2 大港油田中部滩海新近系干酪根类型
a.Ⅱ2型干酪根, G14井(1 736.0 m); b.Ⅱ1型干酪根, G29井(1 767.0 m)
Fig. 2. Neogene kerogen type in the central beach area of Dagang Oilfield
图 3 大港油田中部滩海代表井正烷烃分布曲线
Fig. 3. Normal alkane distribution curve of typical wells in the central beach area of Dagang oilfield
图 4 大港中部滩海馆陶组生物相平面图
A相.泛滥平原; B相.蓄水洼地或泛滥平原小型湖; C相.河道及水下分流河道边部; D相.滨浅湖; E相.前三角洲
Fig. 4. Biofacies map of Guantao Formation in the central beach area of Dagang oilfield
图 5 大港油田中部滩海2001测线层序低层解释
Fig. 5. Sequence stratigraphy interpretation of 2001 profile in the central beach area of Dagang oilfield
图 6 大港油田中部滩海新近纪古湖泊演化趋势
A.以Candona为主的生物组合(浅湖); B.以Ilyocypris为主的介形类组合; C.藻类化石; D.Palaeophycus遗迹组构; E.Skolithos遗迹组构; F.Scoyenia遗迹组构; G.生物扰动组构; H.水生植物为主的孢粉组合(Potamogeton、Polypodiaceae等); I.陆地植物为主的孢粉组合(Magnastites; Artemisia等)
Fig. 6. Paleolake development in the central beach area of Dagang Oilfield during Neogene
表 1 大港油田中部滩海新近系遗迹组构类型及特点
Table 1. Types and features of Neogene ichnofabrics in the central beach area of Dagang oilfield
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