摘要
深入分析了深水勘探"金三角"之一的尼日尔盆地某深水海底扇沉积体系的展布特征,提出了限制区—半限制区—非限制区分区控制的深水海底扇相展布模式,认为不同重力流类型对沉积物的搬运能力是不同的,从陆坡顶部向盆地方向,重力流沉积类型存在"蠕动—滑动—滑塌—碎屑流—浊流"的演化过程.对海平面波动和古地貌对深水海底扇发育的控制进行了分析,结果表明:海平面变化控制了深水海底扇发育的规模,古地貌控制了海底扇沉积体系的展布特征.
The distribution characteristics of the depositional systems of a deep submarine fan in Niger Basin,one of the 'Golden Triangle' areas,are thoroughly analyzed.And based on this,the depositional facies distribution mode of the deep submarine fan model is put forward,which divides the deep submarine fan into the restricted area,semi-restricted area and non-restricted area.Different areas have different sedimentary characteristics.Also the transport capacity of different types of gravity flows is different.From the top of the continental slope to the basin,the evolution process of the gravity flow deposits includes 'creeping-sliding-slumping-debris flow-turbidity'.The control effects of sea level fluctuation and ancient landform on the development of the deep submarine fan are analyzed,and it is shown that the sea level fluctuation controls the development scale of the deep submarine fan and the ancient landform determines the facies distribution characteristics of it.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2012年第2期6-12,117,共7页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家科技重大专项(编号:2008ZX05030-005-01)
关键词
深水海底扇
相展布模式
海平面变化
古地貌
尼日尔盆地
deep submarine fan
facies distribution mode
sea-level fluctuation
ancient landform
Niger Basin
