摘要
陆相断陷湖盆陡坡带由于具有特殊的构造背景,在下降盘易发育各种类型的砂砾岩扇体,且具有很好的含油气前景,近几年各大油田也都将其作为增储上产的重要勘探领域.但由于这些扇体一般都具有较大的隐蔽性,而且控制影响因素复杂,尤其是对于为数较多的受高角度大断层控制的断陷湖盆,在陡坡带进行砂砾岩扇体的勘探具有更大的风险性.本文运用层序地层学、地震精细描述等勘探新理论、新技术和新方法,结合生产实际,对东濮凹陷高角度兰聊陡坡带砂砾岩扇体形成机制及成藏规律进行了多学科综合研究,查明了扇体的成因机制、控制因素、分布规律,并进一步探讨了扇体成藏机理和成藏规律,为下一步勘探指明了有利方向和钻探目标,期望为国内外同类盆地陡坡带油气资源的勘探也提供了一定的借鉴.
Because of the peculiar structure characteristics of the steep slope zone of continental fault\|trough lake basin, there are many more styles sand\|conglomerate fans bearing hydrocarbon at the downthrow. More and more petroleum corporations found large\|scale reserves in these fans. But the exploration to fan reserves will run a larger risk, especially in a fault\|trough lake basin controlled by high\|angle fault. The sand\|conglomerate fans belongs to subtle traps and controlled or influenced by many more factors. After integrated research on the Lanliao steep slope zone of Dongpu depression using sequence stratigraphy and seismic interpretation, the author analyzed the forming mechanism, controlled factors and distribution rules of the sand\|conglomerate fans. The paper indicates that there are 6 kinds of fault structure models of Lanliao fault, and so formed 6 slope-break styles. Combined the result of sequence stratigraphy analysis, the author found alluvial fans, fan deltas, near\|bank subaqueous fans, deepwater turbidity fans and slump turbidity fans in Lanliao steep slope zone, and the last 3 kinds of these fans which formed in 3 section of Shahejie formation have the best condition of bearing hydrocarbon. The paper also indicates that Maogang and Baimiao areas are the main exploration aims and have already found many oil and gas. These areas will be the important exploration hotspots in the future. The results of this research will also provide a useful reference to the other basins in home or overseas.
出处
《地球物理学进展》
CSCD
2004年第2期348-356,共9页
Progress in Geophysics
基金
中国石油化工集团总公司"十五"重点科技开发项目(P03039)资助.
关键词
砂砾岩扇体
高角度陡坡带
坡折带
油气成藏规律
兰聊大断层
东濮凹陷
sand\|conglomerate fans, high\|angle steep slope zone, slope break , hydrocarbon accumulation rule, lanliao fault, dongpu depression
