东明凹陷早第三纪沉积环境与油气

EARLY TERTIARY SEDIMENTARY ENVIRONMENT AND THE OIL AND GAS OF DONG MING DEPRESSION

陈晓东 郭友

Chen Xiadong Gao You

地质矿产部, 华北石油地质局

North China Bureau of Petroleum Geology, Ministry of Geology and Mineral Resources

东明凹陷是华北拗陷区南端的一个新生代沉积盆地,呈北北东向,北窄南宽,面积5000平方公里。凹陷为一早第三纪发育的地堑型断陷盆地。东侧以聊兰断层为界,西侧以长垣断层为界,北与临清地区的等县凹陷毗连,南隔胙城—兰考凸起与中牟凹陷时有相通。具有东部次凹带、西部次凹带、中央隆起带的"两凹一隆"构造格局。中原油田即位于凹陷的北部。

Dong Ming Depression is an early Tertiary block-faulting basin of graben type.The basin in-fillings are predominatingly clastic with subordinate lacustrine chemical rocks.Fluvial sediment developed only in Dong Ying Formation,The lacustrine sediments of Dong Ming Depression are devided into three sedimentary systems:lacustrine allochthonous clastic;and reworked sediments.It is thought that the alluvial fan subfacies,overbank and lake sub-facies,and gravitational current sediment sub-fades with different sedimentary backgrounds are characteristics of the sedimentary environment for block-faulting lake.The alluvial fan sand body and the gravitational current sand body are the major reservior for oil and gas;and the combined structural and lithological trap is the main type of oil and gas traps in Dong Ming Depression.

https://doi.org/10.11781/sysydz198502087