摘要
鹿乡断陷近年来虽在油气勘探方面取得了一系列成果,但该区存在多物源方向交汇、沉积体系划分不清晰;而经典的物源分析方法操作复杂,可靠性差。笔者应用统计学方法,对研究区重矿物的相对含量进行聚类分析,结合研究区砂岩等厚图,对鹿乡断陷双阳组各段的物源方向进行分析,结果表明:在双阳组一段沉积时期,研究区存在西南、南部和东部3个物源方向;在双阳组二段沉积时期,研究区存在东部、南部、西南和西北4个物源方向;在双阳组三段沉积时期,研究区存在东部和西北部2个物源方向。双阳组沉积时期,西北和南部方向物源的沉积物供给呈现"弱--强--弱"的变化特点,东部方向物源的沉积物供给不断减弱。沉积体系的规模受控于沉积速率。
Although a series of results was obtained in oil and gas exploration of Luxiang fault depression in recent years,there is multi-source direction convergence in this area,and the division of sedimentary system is unclear.However,the classical provenance analysis method is complicated with poor reliability.The authors made cluster analysis on relative contents of heavy minerals in this area by statistical method and with sandstone isopach map,studied the provenance direction of different members in Shuangyang Formation of Luxiang fault depression.The results show that during the deposition of the Member 1 in Shuangyang Formation there were three provenance directions in southwest,south and east;during of the Member 2 in the Formation there were four directions in east,south,southwest and northwest;while during of the Member 3 in the Formation there were two directions in east and northwest.The provenance supply in northwest and south presented the characteristics of＂weak-strong-weak＂ during the deposition of Shuangyang Formation,and the supply was constantly weaken in east.The scale of depositional system was controlled by depositional velocity.
出处
《世界地质》
CAS
CSCD
2010年第3期466-472,共7页
World Geology
基金
国家重大科技专项(2008ZX05018-001)
关键词
鹿乡断陷
重矿物
聚类分析
物源分析
Luxiang fault depression
heavy minerals
cluster analysis
provenance analysis
