摘要:
在现有的钻井、测井、地球物理及古生物等资料的基础上,应用储层沉积学、层序地层学等方法,深入研究了白云凹陷沉积充填演化模式及其展布规律。由于受重大构造事件、气候、物源供给、古地理和海平面变化等多种因素的影响,白云凹陷形成了独特的三层结构及多类型盆地叠置的沉积体系,其对深水油气形成及其分布富集特征等均具有深刻的影响和制约。同时,笔者在上述研究的基础上,还综合分析了白云深水区烃源岩生烃潜力、储盖组合及深水扇沉积体系与油气运聚成藏之间的成因耦合关系。白云凹陷深水扇圈闭成藏的烃源应以恩平组烃源岩的贡献为主,凹陷主体应以深水扇储层及其形成的各种圈闭为目标,周边以23.8Ma以前的浅水砂岩储层及其大型披覆构造为勘探重点,以期获得深水油气勘探的新突破。
Abstract:
The present paper presented some new approaches to fathom the sedimentary evolution and hydrocarbon accumulation in the Baiyun depression, Zhujiangkou Basin with the aid of sedimentological and sequence stratigraphic methods referenced to the existing cores, well logs, geophysical and palaeontological data. The combination of many factors such as tectonic events, climatic changes, sediment supply, palaeogeographic features and sea-level changes may be responsible for the formation of unique sedimentary and stacking patterns in the Baiyun depression, which may, in turn, have an important effect on the formation and distribution of the deepwater hydrocarbon accumulation. Other aspects focus on the approaches of the genetic affiliation between hydrocarbon potential, reservoir-seal associations, deep-water sedimentary systems and hydrocarbon accumulation and migration in the Baiyun depression. The source rocks in the Enping Formation contribute to the hydrocarbons accumulated in the deep-water fan traps. The key areas for hydrocarbon exploration are delineated dominantly in the deep-water fan reservoir rocks and associated traps, and subordinately in the shallow-water sandstones older than 23.8 Ma and large-scale drape structures in the Basin.
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