摘要
泌阳凹陷下第三系蕴藏着丰富的石油、天然气和天然碱矿产资源,在我国以“小而肥”著称。它是在秦岭褶皱带基底上由拉张力形成的一个中、新生代陆相断陷盐湖盆地,其中核桃园组(渐新世)是湖盆最活跃的沉积和充填时期。在该断陷盐湖盆地中共识别出5种沉积体系;(1)扇—三角洲;(2)正常或淡水—稍咸水湖泊;(3)盐湖;(4)三角洲;(5)冲积扇和冲积平原沉积体系。核桃园组沉积时期可进一步划分为三个沉积演化阶段:(1)正常湖泊扩展阶段;(2)盐湖蒸发浓缩阶段;(3)正常湖泊萎缩阶段。沉积体系及演化明显受边界同生断裂、基本构造型式和古气候的控制。
The Lower Tertiary in Biyang depression bears abundant oil and gas as well as trona resources , known to be ' small but greatly payable' in China . It is a Meso- Cenozoic , terrestrial faulted saline lake basin , formed by tension and developed on the basement of Qinling fold belt. The Hetaoyuan Formation (Oligocene) was deposited at the most active depositional and infilling stage of the lake basin , and five sedimentary systems can be defined : (1) fen-delta ;(2)normal or fresh-brackish lake ;(3)saline lake;(4)delta ;and (5)alluvial fen and alluvial plain . During the deposition of Hetaoyuan Formation three stages of evolution are divided : (1 )the expanding stage of normal lake ; (2)the evaporative concentration stage of saline lake ;and (3)the shrinking stage of normal lake .The depositional systems and evolution were obviously controlled by the boundary growth feults and the basic structural pattern as well as the paleoclimate .
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1991年第4期419-428,共10页
Earth Science-Journal of China University of Geosciences
关键词
盆地
沉积体系
泌阳凹陷
核桃园组
faulted saline lake basin , Hetaoyuan Formation , depositional system , Biyang depression .
