摘要
地层层序研究,为针对沉积—层控矿床找矿勘探工作中的一种重要手段,因此,搞清研究区内含盐地层层序特征很有必要。本研究以层序地层学理论为指导,基于研究区周围的区域地质、钻探、测井和岩心等相关资料,开展地层研究。对单井J1进行层序地层划分,自下而上分为EB1、EB2、EB3和EB4四个层序界面,识别划分单井沉积相,在单井沉积相的基础上,进一步建立沉积相平面展布。结果表明:农波凹陷古近系含盐地层划分为ESQ1、ESQ2、ESQ3三个三级层序,每个层序均发育低位—湖侵—高位三种体系域,从层序特征来看,ESQ1层序中蒸发岩段分布范围最广,沉积厚度最大,说明第一次海侵范围广泛,是勘查钾镁盐矿体最有潜力的地段。
Based on the guidance of sequence stratigaraphy theory,the regional geological,drilling,well logging and core data around the study area,and the single well sequence stratigraphy analysis,this paper establishes the Paleogene Nongbo formation stratigraphy sequence framework by mapping the connecting-well section,and the salt bearing strata in Nongbo depression are preliminarily divided in to three third order sequences.At the same time,carries out the sedimentary facies division and sedimentary system tract study in the sequence framework,confirms the sedimentary facies types such as salt-dry salt ping,shore shallow lake and semi-deep lake,establishes the sedimentary models of each strata of Nongbo formation,On this basis,this paper proposes the depositional rule and formation mechanism of the Paleocene salt-bearing stratum Formation systematically.
作者
赵建华
王加昇
ZHAO Jianhua;WANG Jiasheng(Faculty of Land and Resources Engineering,Kunming University of Science and Technology,Kunming 650031,Yunnan,China)
出处
《矿产与地质》
2023年第4期768-775,共8页
Mineral Resources and Geology
基金
云南省科技计划项目(编号:202202AG050006)资助。
关键词
层序地层
体系域
沉积相
主控因素
老挝甘蒙省
stratigraphy
system tracts
sedimentary facies
main controlling factors
Khammouan of Laos
