CAJ | 학술논문

根据南黄海盆地北部坳陷东北凹新的钻井和地震资料，本文详细研究了该凹陷新钻遇地层的地震反射特征及典型岩性剖面，对该套地层内具有代表性的深度层位采集沉积碎屑样品，利用孢粉组合特征综合判定了该套地层的沉积年代，结合相邻盆地侏罗纪地层发育情况，认为该套地层为中-晚侏罗世。从岩性及孢粉组合上该井主钻遇地层可划分为上下两个组合，上组合以裸子植物花粉特别是克拉梭粉占绝对优势，下组合具有较高含量的桫椤孢和克拉梭粉，以此推断南黄海盆地东北凹是以中-晚侏罗世为主的沉积凹陷。根据井震标定信息，结合凹陷内二维地震测网综合地震追踪对比结果，凹陷内侏罗系呈现西北厚东南薄的格局，北部千里岩隆起带为盆地的重要物源区。
근거남황해분지북부요함동북요신적찬정화지진자료，본문상세연구료해요함신찬우지층적지진반사특정급전형암성부면，대해투지층내구유대표성적심도층위채집침적쇄설양품，이용포분조합특정종합판정료해투지층적침적년대，결합상린분지주라기지층발육정황，인위해투지층위중-만주라세。종암성급포분조합상해정주찬우지층가화분위상하량개조합，상조합이라자식물화분특별시극랍사분점절대우세，하조합구유교고함량적사라포화극랍사분，이차추단남황해분지동북요시이중-만주라세위주적침적요함。근거정진표정신식，결합요함내이유지진측망종합지진추종대비결과，요함내주라계정현서북후동남박적격국，북부천리암륭기대위분지적중요물원구。
Based on the newly drilled well S1 and seismic data in north-east sag, northern depression, South Yellow Sea, this paper analyzed the seismic reflective features and lithology of the well S1 in detail. In order to constrain the age of the target strata, paleontological and Sporopollen study is carried out for core samples. Based on the result of these studies and the regional correlation, it is proposed that the target strata are Middle-Late Jurassic in age. From lithologic association and Sporoplllen assemblages, the drilled strata can be divided into two parts, the upper one is dominated by Gymosperm pollen especially Classopollis and the lower one has high contents of Cyathea spores and Classopollis. According to the well-seismic calibration, the 2D seismic interpretation is tracked throughout the sag, it is showed that the Jurassic strata in this sag get increasingly thicker from southeast to northwest in sedimentary framework. We suggested that the Qianliyan uplifted zone in the north side of the sag may be the main provenance for the Jurassic strata.