摘要
谭庄凹陷位于周口坳陷中部凹陷带,是一个中、新生代两期断陷叠合的次级构造单元,其不同井区下白垩统永丰组物源体系至今尚无统一的认识。通过开展碎屑岩类分析、重矿物组合特征、砂砾岩分布特征等方法的研究,对影响谭庄凹陷永丰组沉积的物源体系进行了综合判定,明确了物源方向和母岩类型。研究结果表明,谭庄凹陷永丰组沉积时期存在南、北两大物源体系,北部物源区为变质岩发育的郸城凸起,南部物源区为火成岩发育的平舆凸起;双楼田构造带的周18井、巴1井以北部郸城地区物源为主,呈南北混源特征;周15井、周14井、周21井、周23井、周参12井等主要受南部平舆地区物源影响,并可进一步划分为东西两个供给分支方向。
Tanzhuang sag is located in the central depression belt of Zhoukou depression,which is a secondary structural unit of Mesozoic-Cenozoic fault depression and the provenance system of the lower Cretaceous Yongfeng formation in different well areas has not been recognized.Based on the analysis of clastic rocks,the characteristics of heavy mineral assemblage and the distribution characteristics of glutenite,the provenance system affecting the deposition of Yongfeng formation in Tanzhuang sag is comprehensively determined,and the provenance direction and parent rock type are determined.The results show that there are two provenance systems in the Yongfeng formation of Tanzhuang sag,the northern provenance is Dancheng uplift with metamorphic rocks,and the southern provenance area is Pingyu uplift with igneous rocks.Well Zhou 18 and well Ba 1 in Shuangloutian structural belt are mainly derived from Dancheng area in the north,showing the characteristics of north-south mixed source.Well Zhou 15,well Zhou 14,well Zhou 21,well Zhou 23 and well Zhoucan 12 are mainly affected by the provenance of Pingyu area in the south,and can be further divided into two supply branches of east and west.
作者
李杭兵
顾超
罗家群
石正勇
刘鹏
LI Hangbing;GU Chao;LUO Jiaqun;SHI Zhengyong;LIU Peng(Exploration&Development Research Institute of Henan Oilfield Company,SINOPEC,Nanyang,Henan 473132,China;Henan Oilfield Company,SINOPEC,Nanyang,Henan 473132,China)
出处
《石油地质与工程》
CAS
2020年第6期38-42,共5页
Petroleum Geology and Engineering
关键词
谭庄凹陷
永丰组
物源体系
Tanzhuang sag
Yongfeng formation
provenance system
