摘要
应用层序地层学的理沦分析廊固凹陷古近系将划分为1个一级层序、3个二级层序Ⅰ，Ⅱ，Ⅲ、11个三级层序（SQ1～SQ11），发现层序构造演化研究廊固凹陷经历了断陷初始期、强烈断陷期、断陷回返上升期厦断陷消亡期4个阶段，与层序有关的（生）储盖组合在廊固凹陷十分发育，廊固凹陷旧州-固安构造带是隐蔽油气藏发育的有利区带，在SQ4～SQ7近岸水下扇或扇三角洲砂体向湖泊泥岩尖灭带附近与构造单斜的结合部位，是形成上倾尖灭岩性油藏的的有利部位，该带SQ1～sQ3（沙四段）发育的近岸水下扇砂体或砾岩体是廊固凹陷古近系深部油气（特别是天然气）的重要勘探方向。
After exploration of oil and gas for more than twenty years, it is difficult to find out the ancient buried hill and paleogene structure trap. It has important theory and practical significance to explorate blind reservoirs by using the basic principles of sequence stratigraphy. Paleo gene of Langgu subdepression is divided into one Megasequence,two supersequences and eleven third-order sequences. Evolution of tectonics and sequence experienced initial faulting period, strongly faulted period,the return of the rise faulted period and disappearing faulted period. Oil and gas assembly connected with sequence developed well in Langgu subdepression. Jiu zhou-Gu＇ an structure belt is the favorable belt to develop blind reservoirs. The intersection sites of submarine fan or fan delta which pinch out at mudstone and structural monoclinic are the favorable position to form the up-dip-pinch-out-lithologic deposit. Submarine fan sandstone or conglomerate developed in SQ1-SQ3 （Es4）is the important directions to explorate Paleogene deep hydrocarbon in the Langgu subdepression,particularly natural gas.
出处
《矿物岩石》
CAS
CSCD
北大核心
2006年第4期75-82,共8页
Mineralogy and Petrology
关键词
廊固凹陷
古近系
层序地层
隐蔽油气藏
Langgu subdepression
Paleogene
sequence stratigraphy
exploration of blind reser voirs
