摘要
通过岩心观察、薄片分析,结合测井和录井资料及粒度分析等化验资料,对柴达木盆地北缘马北地区古近系下干柴沟组下段砂砾岩的沉积环境和沉积序列进行了深入研究,认为该区古近系主要为辫状河沉积,并详细讨论了研究区辫状河各微相特征。研究区古近系岩性主要以砾岩、砂岩和泥岩沉积为主,砾岩所占比例不高,具有正旋回沉积序列特征。根据辫状河沉积环境特征和沉积序列建立了研究区辫状河沉积模式。通过对研究区储层物性和沉积微相的关系分析,认为沉积微相为研究区储层的主控因素。
Based on outcrop observation,core description,well logging and analysis assay data,the sedimentary features and sequence of lower Ganchaigou Formation in Mabei area,western segment of northern margin of Qaidam basin is analyzed.The results indicate that it develops braided deposition.And a detailed description of the sedimentary microfacies characteristic of braided deposit is given.Conglomerates,sandstones,mudstones are the main lithology type,and the percentage of conglomerates is low.And it is a normal grading change from coarse to thin.Based on this conclusion,sedimentary features and sequence of braided river are established.With the deep research on sedimentary sequence and the physical properties characteristics,the sedimentary microfacies are the main controlling factors of reservoir.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2012年第5期849-855,共7页
Natural Gas Geoscience
基金
中国科学院油气资源研究重点实验室开放基金(编号:KFJJ2012-05)资助
关键词
沉积特征
辫状河
下干柴沟组
柴达木盆地
Sedimentary characteristics
Braided river
Lower Ganchaigou Formation
Qaidam basin
