渤海海域渤中34-A地区古近系介形类组合特征及沉积环境  

PALEOGENE OSTRACODA ASSEMBLAGE AND SEDIMENTARY ENVIRONMENT IN THE BOZHONG 34-A OIL FIELD OF BOHAI AREA

作　　者：姚雅琴[1] 赵都菁[1] 曲日涛[1] 杨纪磊[1] 齐玉民[1,2] 庾永钊 杨娇娇 曹洁 YAO Yaqin;ZHAO Dujing;QU Ritao;YANG Jilei;QI Yumin;YU Yongzhao;YANG Jiaojiao;CAO Jie(Engineering Technology Company,CNOOC,Tianjin 300452,China;iRock Technologies Co.,Ltd,Beijing 100094)

机构地区：[1]中海油能源发展股份有限公司工程技术公司,天津300452 [2]数岩科技(厦门)股份有限公司,北京100094

出　　处：《微体古生物学报》2019年第3期281-287,共7页Acta Micropalaeontologica Sinica

摘　　要：在渤海海域渤中34-A地区东营组二段下部,发现了以渤海地方属种具棘绍曾介Shaozengia echinata、腹瘤绍曾介S.ventrinodosa、鼓包绍曾介S.gibbosa等为主的大量介形类化石,指示沉积水体环境为淡水-微咸水的滨湖-浅湖;在沙河街组一段上部发现了指示沙河街组一段上亚段存在的李家广北介Guangbeinia lijiaensis亚组合,亚组合发育有椭圆西营介Xiyingia elliptica、高西营介X.alta等大个体、高梯形的介形类,反映当时浅湖-半深湖的沉积环境。通过东营组二段下部与沙河街组一段上部两个介形类发育段的追踪,重新厘定了研究区东营组的地层界面,并确定了沙河街组一段的连续存在。Numerous ostracoda fossils, such as Shaozengia echinata, S. ventrinodosa and S. gibbosa, the typical Bohai area characteristics, were found in Ed2(the Lower Member 2 of Dongying Formation) of Bozhong 34-A Oil Field. Sedimentary water was freshened to brackish in one. The Guangbeinia lijiaensis sub-assemblage was found to indicate the existence of the upper Es1 in the upper Es1(the Upper Member 1 of Shahejie Formation). The Guangbeinia lijiaensis sub-assemblage, including Xiyingia elliptica, X. alta and some large individuals, high trapezoidal of ostracodes, reflects the sedimentary environment of shallow lake to semi-deep lake. These two ostracodal zones in the Ed2 and the upper Es1 were studied to provide new definition of the Ed2 top interface, and suggests the widespread of the Es1.

关 键 词：介形类 沉积环境 地层划分 渤中34-A地区 

分 类 号：Q[生物学]