松辽盆地黑鱼泡凹陷姚家组层序地层与沉积体系

Characteristics of sequence stratigraphy and sedimentary system of Yaojia Formation in Heiyupao Depression,Songliao Basin

对松辽盆地黑鱼泡凹陷姚家组层序划分和体系域类型等研究表明,整个姚家组为1个三级层序,可划分为7个准层序,主要发育低位体系域、湖扩体系域和高位体系域。各级层序界面主要依据岩性组合、测井响应、生物标志及地震剖面等识别。黑鱼泡凹陷在姚家组沉积时期主要发育曲流河和三角洲沉积体系,其中曲流河沉积体系发育河道充填组合、河道边缘组合和泛滥平原组合亚相,三角洲沉积体系主要发育三角洲平原和三角洲前缘亚相。分流河道砂体、水下分流河道砂体、河口坝砂体、远砂坝及席状砂为主要的油气储集单元。

The research on sequence classification and system tract types shows that the sequence framework of Yaojia Formation in Heiyu-pao Depression of Songliao Basin could be divided into 1 third-order sequence and 7 subsequences.Lowstand?transgressive and highstand system tracts were ascertained.Sequence interface can be recognized according to the lithological association,log re-sponse,biomarker and seismic section mark.The Yaojia Formation mainly developed meandering river and delta depositional sys-tems:the former consists of channel-filling,channel margins,flood plain and delta plain facies,and the latter consists of delta front and delta front facies.Sand bodies involved (underwater) distributary channel,mouth bar,distal bar and sand sheet are considered as the important reservoir elements.