莺-琼盆地低位沉积模式的新探讨
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摘要
结合国外相似背景的实例 ,对莺 琼盆地的形态、构造、沉积等特征以及周边物源区地貌、水系进行了分析 ,认为本区存在多种类型的低位体 ,除发育经典的发散型低位沉积体系外 ,还具备发育汇聚型低位沉积体系的条件 ;发散型低位沉积体系因边界条件不同又发育多种类型 ,其岩性各异 ;重力作用造成的滑塌体和浊积体的地震反射特征与盆底扇类似。只有在层序分析中考虑多种因素 ,对不同类型低位体采用不同的解释模式 ,才能提高对其展布及岩性预测的准确性
In combination with the analogs in the world, the Ying?Qiong basin has been analyzed for its geometry, tectonics, deposition and surrounding provenance topography and drainage systems. Thereby it is considered that there are several types of lowstand deposition bodies in the basin, with both conventional divergent depositional systems and convergent systems probably developed. Owing to various boundary condition, the divergent systems can be divided into several subtypes different in lithology. The gravitational slump deposits and turbidities are similar to the basin_floor fans in seismic reflection. It is necessary to consider multiple factors in sequence analyses and to apply different interpretation models for different types of lowstand bodies, in order to enhance prediction accuracy of their distribution and lithology.
In combination with the analogs in the world, the Ying?Qiong basin has been analyzed for its geometry, tectonics, deposition and surrounding provenance topography and drainage systems. Thereby it is considered that there are several types of lowstand deposition bodies in the basin, with both conventional divergent depositional systems and convergent systems probably developed. Owing to various boundary condition, the divergent systems can be divided into several subtypes different in lithology. The gravitational slump deposits and turbidities are similar to the basin_floor fans in seismic reflection. It is necessary to consider multiple factors in sequence analyses and to apply different interpretation models for different types of lowstand bodies, in order to enhance prediction accuracy of their distribution and lithology.
引文
1)吕明.莺歌海盆地莺东构造带沉积演化特征及有利勘探区带.1997
2)解习农.莺东斜坡带中南段层序充填特征与天然气有利勘探方向研究.2001
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2)解习农.莺东斜坡带中南段层序充填特征与天然气有利勘探方向研究.2001
1 VailPR .Thestratigraphicsignaturesoftectonics,eustasyandsedimentology_anoverview.In:Einscleetal.(Eds).Cyclesandeventsinstratigra phy,Springer_VerlagBerlinHeidelberg,1991
2 HesseR ,RakofskyA .Deep_seachannel/submarine_yazoosystemoftheLabradorsea:anewdeep_waterfaciesmodel.AAPGBull.1992,76(5):680～707
3 ShanmugamG .Basin_floorfansintheNorthSea:sequencestratigraphicmodelsvs.sedimentaryfacies.AAPGBull.1995,79(1):477～512
4 PosamentierHW .Forcedregressionsinasequencestratigraphicframework:concepts,examplesandexplorationsignificance.AAPGBull.1992,76(11):1687～1709
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