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OALib Journal期刊
ISSN: 2333-9721
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柴达木盆地马仙地区下干柴沟组上段辫状河三角洲沉积特征
Keywords: 柴达木盆地,辫状河三角洲,沉积特征,马仙地区,下干柴沟组
Abstract:
？通过分析岩心、铸体薄片及测井等资料，可知柴达木盆地马仙地区下干柴沟组上段主要为含砾砂岩、砂岩、粉砂岩和泥岩构成的一套碎屑岩组合，发育板状(或槽状)交错层理，碎屑岩粒度粗，成分成熟度和结构成熟度中等，粒度概率曲线为3段式或2段式。研究认为下干柴沟组上段是较强水动力条件下牵引流沉积的产物，沉积环境属于辫状河三角洲。依据水动力特点和岩心相、测井相等相标志，可将其划分为2种亚相和5种微相:辫状河三角洲平原分流河道、分流河道间及辫状河三角洲前缘水下分流河道、水下分流河道间、河口坝。下干柴沟组上段辫状河三角洲沉积经历了1次湖侵—湖退的演化过程，各时期的沉积相展布特点略有不同，辫状河三角洲平原分流河道和辫状河三角洲前缘水下分流河道沉积在研究区内分布广泛，其砂体厚度大，具有广阔的油气勘探前景。
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