摘要
根据测井、地震和岩心等地质资料,运用印模法及综合地质法对鄂尔多斯盆地陇东地区侏罗系沉积前的古地貌进行恢复。研究表明,鄂尔多斯盆地陇东地区侏罗系古地貌形态主要为古高地、谷河谷、古谷坡、古河间丘、古阶地。对侏罗系沉积前古地貌对延安组油藏的控制分析认为,油藏主要分布于紧邻高地的古谷坡等地势相对较高的地带。古地貌形成的有利成藏条件为下切河谷提供了来自延长组烃源岩生成的油气向上运移通道,古谷坡控制着储层砂体的类型和分布规模,地层"印模"所产生的差异压实形成了后期构造圈闭的相对高点。
With logging, seismic, core and other geological data,the paleogeomorphology was rebuilt according to the impression method and comprehensive geological method. The results reveal various paleogeomorphic patterns, such as high land, valley, brae, mound and river terrace. Based on the relationships between the paleomorphology and the formation of Yan＇an oil reservoir, the authors inferred that reservoirs are mainly distributed in the brae near high land and other relatively high zones. Favorable conditions for petroleum accumulation included the upward migration pathway of hydrocarbon fi：om source rock of Yanchang Formation via the incised valley, the type and distribution of reservoirs and sand bodies were controlled by the brae, and the relatively high zones of later structural traps were formed by the ＂impression＂ of layers.
出处
《地质通报》
CAS
CSCD
北大核心
2013年第11期1806-1814,共9页
Geological Bulletin of China
基金
国家重点基础研究发展计划项目(编号:2003CB214602)
西安石油大学青年科技创新基金项目(编号:2012QN003)
关键词
鄂尔多斯盆地
古地貌
前侏罗纪
油气聚集
Ordos basin
palaeogeomorphology
Pre-Jurassic
oil accumulation
