LACUSTRINE SOURCE ROCKS FORMED IN SALINE LAKE DURING FUNING FORMATION IN SOUTH-5 SAG OF SOUTH YELLOW SEA BASIN
-
摘要: 通过对南五凹钻井所揭示的阜宁组进行岩性、地球化学、古生物及地震相等综合分析证实,南五凹阜宁组发育中深湖相泥质烃源岩,且该套烃源岩形成于"广湖咸水"沉积环境。"广湖"即湖盆分布广泛,中深湖相泥质烃源岩在凹陷深洼处和缓坡带均有发育,平面上面积大,纵向上厚度大,具备生成油气的物质基础。"咸水"即烃源岩形成时期湖盆受到了海侵影响,致使水体性质偏咸。南五凹与中国东部古新世—始新世期间曾遭受海侵影响的其他湖盆类似,其形成的咸化烃源岩具有"排烃早"的特征。南五凹阜宁组湖相烃源岩"广湖咸水"沉积特征对于油气勘探具有重要意义。Abstract: Lacustrine source rocks in the South-5 Sag of South Yellow Sea Basin were studied based on lithology, geochemistry, paleontology, seismic facies and the data from boreholes. The lacustrine source rocks were formed in saline water during the expanding stage of the lake. They occur almost everywhere in the South-5 Sag including the lake center and the slope. The source rocks in the Funing Formation are thick enough to generate hydrocarbons hypothetically. On the other side, the lake water was salty or brine during the source rock was formed in the period of Palaeocene. The water salinity came from sea water invation, documented by the evidence from geochemistry, paleontology and limestone. Data suggests that hydrocarbon generation of the lacustrine source rock of the Funing Formation is earlier than those from the source rocks in other basins due to its particular forming environment. The recognition of the saline lacustrine source rocks is very important for evaluating the resource potential of the sag or even the whole basin.
-
Key words:
- South-5 Sag /
- Funing Formation /
- source rock /
- brine water /
- South Yellow Sea Basin
-
-
计量
- 文章访问数: 264
- PDF下载数: 7
- 施引文献: 0
下载: