白音查干凹陷锡林好来地区下白垩统物源分析  

Provenance analysis of Lower Cretaceous in Xilinhaolai Area of Baiyinchagan Depression

作　　者：张立强[1] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院,山东青岛266555

出　　处：《断块油气田》2011年第4期429-432,共4页Fault-Block Oil & Gas Field

基　　金：国家油气重大专项"盆地深层沉积充填历史及建模技术"(2008ZX05008-004-021)资助

摘　　要：应用古地貌及沟谷展布特征、重矿物组合、岩屑类型及分布、地震反射结构、砂体展布等多种方法,对白音查干凹陷锡林好来地区下白垩统腾格尔组沉积时期的物源体系进行了研究。古地貌恢复与沟谷展布特征为判断沉积盆地的古物源体系提供了借鉴作用。锡林好来地区所在的盆地缓坡带分为斜坡带和断阶带2个单元,断阶带发育与盆地长轴方向平行的沟谷,南部斜坡带发育垂直于盆地走向的沟谷。受物源分异的影响,不同区域重矿物组合及岩屑类型差异较大,西部断阶带以花岗片麻岩等变质岩岩屑组合为主,东部达尔其西以片岩等变质岩岩屑占优势,南部斜坡带普遍含碳酸盐鲕粒、砂屑等内碎屑。研究区受来源于西、南部和东部3个不同方向的物源影响,来自西部的长轴方向物源对工区影响大,长轴三角洲体系的前缘为有利的隐蔽油藏勘探区。Provenance system of sedimentary period of Lower Cretaceous Tenggeer Formation in Xilinhaolai Area of Baiyinchagan Depression is studied through the analysis of the features of palaeogeomorphology and valley distribution,heavy mineral assemblage,debrital rock type and distribution,seismic reflection configuration and sand body distribution.The palaeogeomorphic reconstruction and valley distribution features provide a reference for the analysis of paleo-provenance system of sedimentary basin.Gentle slope zone of the basin where Xilinhaolai Area is located in can be divided into the slope zone and fault zone.The valley developed in fault zone is parallel to the long axis of basin,and the valley developed in the southern slope zone is perpendicular to the long axis of basin.Heavy mineral assemblage and debris type are different in different areas because of the differential effect of provenance.The fault zone of western part is mainly the debris assemblage of metamorphic rock（granite gneiss）.The western Daerqi Oilfield in eastern part is mainly the debris assemblage of metamorphic rock（shist）.Intraclasts,i.e.carbonate oolite and debris,widely exist in the southern slope zone.The provenance from the western long axis direction has a great effect on work area due to the provenance effect of different directions from western,southern and eastern parts.Long-axis delta regime front is a beneficial exploration area of subtle reservoir.

关 键 词：下白垩统 物源方向 古地貌 白音查干凹陷 

分 类 号：TE121.31[石油与天然气工程—油气勘探]