江苏高邮凹陷古近系戴南组一段物源体系和沉积相

对碎屑组分和重矿物的分析结果表明，高邮凹陷戴南组一段沉积时期，北部斜坡带的花庄、富民北部和永安地区沉积物来自柘垛低凸起方向，联盟庄和马家嘴地区沉积物来自菱塘桥低凸起方向；南部陡坡带沉积物来自通扬隆起，周庄地区沉积物来自东部物源区。戴一段沉积物母岩岩性以中-低级变质岩为主，中酸性火山岩的分布较基性火山岩要广，深成岩较少或没有。根据岩心观察、录测井资料分析，及研究区物源体系特征，认为高邮凹陷戴南组一段沉积时期，发育扇三角洲、三角洲、近岸水下扇和湖泊沉积。凹陷北部斜坡带地形坡度较缓，来自柘垛低凸起和菱塘桥低凸起方向的沉积物呈点物源形式沿水下河道在缓坡带形成三角洲沉积，物源供给量的差异导致三角洲朵体大小不同；凹陷南部陡坡带地形高差较大，在湖岸临近高地发育多条水下河道，沉积物被剥蚀后呈多物源形式就近入湖沉积，加之母岩类型差异，在湖盆陡坡带形成近岸水下扇、扇三角洲沉积体；凹陷西南部因汉留断层的存在造成三角洲前缘与前三角洲的高差，使原沉积的三角洲前缘沉积物发生滑塌，并以线状物源形式在较深水处形成滑塌浊积扇；凹陷中部和砂岩及砂砾岩沉积体的侧翼和远端受构造活动影响较小，物源供给不充分，发育湖泊相沉积。

Provenance system and sedimentary facies of the Member 1 of Paleogene Dainan Formation in Gaoyou Sag,Jiangsu Province

Clastic component and heavy mineral analyses show that sediments of Huazhuang,northern Fumin and Yong'an areas in the northern slope were all from Zheduo low convex,while those of Lianmengzhuang and Majiazui areas came from the Lingtangqiao low convex,those of the southern steep slope were from Tongyang Uplift,and those of Zhouzhuang area came from eastern provenance during the depositional period of the Member 1 of Paleogene Dainan Formation in the Gaoyou Sag.Mother rocks of the Member 1 of Dainan Formatio...