摘要
松辽盆地中央古隆起基岩是一个有利的油气勘探领域。以往对中央古隆起的基底特征研究较少,内幕地层、断裂特征一直不清楚。为此,结合钻探成果,根据地震反射特征识别三个基岩内幕地震反射界面,划分四套内幕岩层;根据断裂特征,将断裂划分为四种类型、四个发育期次;在断裂成因探讨的基础上形成断裂发育模式。研究认为:基岩内幕主要发育前T_(b2)地震反射界面形成的逆冲断层、后T_(b2)地震反射界面形成的逆冲断层、压扭期断层和白垩纪断陷期断层;中央古隆起基岩断裂主要形成于四个阶段,即海西挤压期、印支挤压期、早中侏罗世压扭期和白垩纪断陷期。该成果对中央古隆起基岩油气藏的勘探具有参考价值。
The bedrock in the central paleo-uplift in the Songliao Basin is a favorable area for oil and gas exploration.As the basement characteristics of the central paleo-uplift have been rarely studied in the past,the stratigraphic and fault characteristics of the interior remain to be clarified.For this reason,on the basis of drilling results,three seismic reflection interfaces in the bedrock interior were identified according to the seismic reflection characteristics,and four sets of interior rock layers were divided;the faults were divided into four types and four development stages according to their characteristics;after the fault causes were discussed,a fault development pattern was obtained.The study concludes that the bedrock interior has mainly developed into thrust faults and extensional normal faults in four stages,namely,the thrust fault formed at the front T_(b2)seismic reflection interface,the thrust fault formed at the rear T_(b2)seismic reflection interface,the fault formed in the compression and torsion period,and that formed in the Cretaceous fault-depression period;the bedrock faults in the central paleo-uplift mainly formed in the four stages of the Hercynian compression period,the Indosinian compression period,the Early-Middle Jurassic compression and torsion period,and the Cretaceous fault-depression period.The results can serve as a reference for the exploration of bedrock oil and gas reservoirs in the central paleo-uplift.
作者
何静波
刘剑伦
李强强
王贵艳
赵婧
许菲
HE Jingbo;LIU Jianlun;LI Qiangqiang;WANG Guiyan;ZHAO Jing;XU Fei(Geological Research Center,GRI,BGP Inc.,CNPC,Zhuozhou,Hebei 072750,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2022年第S01期229-235,18-19,共9页
Oil Geophysical Prospecting
关键词
松辽盆地
中央古隆起
基岩内幕
断裂特征
Songliao Basin
central paleo-uplift
bedrock interior
fault characteristic
