Depositional Systems and Reservoir Distribution Regulations of the Sha-3 Member in Puwei Sag, Dongpu Depression
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摘要: 为了提高东濮凹陷濮卫环洼带隐蔽油气藏的勘探精度,以层序地层学理论和瓦尔特相律为指导,通过钻井岩芯、测井和地震的三元分析法,综合构造-地层分析,在东濮凹陷濮卫环洼带沙三段共识别出湖底扇、滨浅湖砂坝-风暴、低位盐湖、三角洲、深湖-半深湖等五种沉积体系,分析了主要储层发育期沉积体系的时空展布特征,探讨了层序地层体制下沙三段的沉积体系发育模式及储层发育规律,指出环洼带东部及北部水下河道与坡折带的交汇处是储层的主要发育地带,其沉积体系主要为湖底扇、三角洲沉积体系.Abstract: In order to increase the exploration level of hidden oil & gas pools in the area around Puwei sag,Dongpu depression, sequence stratigraphy theory and the Walther' s law are taken as a guide to research Sha-3 member.On the basis of the analy ses of cores, logs and seismic data, combined with the analyses of basin structure and stratigraphy, 5 depositional systems are recognized in Sha-3 member, i.e.lake-turbidite fan system, coast & shallow lake system with sand dam and tempestite, low-stand salt lake system, delta system and deep &hemi-deep lake system.The characteristics of lithoface assemblages of each system are studied one by one.The dist ribution patterns of the depositional systems in space are analysed in each main reservoir body member, while the sedimentary models and reservoir distribution regulations of the Sha-3 member are also discussed.It is pointed out that the junctions of the under water channels and the slope break belt in the east and north of Puwei sag are the places where the main reservoir bodies develop very well, and where lake-turbidite fan system and delta system develop.
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