THE PALEOGENE SEDIMENTARY SYSTEM AND EVOLUTION CHARACTERISTICS OF LENGHU STRUCTURAL BELT IN NORTHERN QAIDAM BASIN
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摘要:
通过对柴达木盆地北缘西段重点探井的岩心观测、重矿物分析、测井数据及地震资料的分析，研究了冷湖构造带古近系沉积体系及演化特征和不同时期沉积微相及砂体的展布规律.结果认为，冷湖构造带古近系主要发育冲积扇-辫状河-辫状河三角洲-湖泊沉积体系，物源来自北东方向的小赛什腾山和赛什腾山附近.古近系路乐河组（E1+2）沉积期，主要发育辫状河以及辫状河三角洲平原沉积，仅在靠近山前发育少量冲积扇沉积；至下干柴沟组（E3）沉积时期，主要发育辫状河、辫状河三角洲平原、辫状河三角洲前缘及滨-浅湖沉积.古近纪时期冷湖构造带表现为一次较大规模的水进过程，纵向沉积继承性明显，很好地记录了这一沉积演化过程.这一沉积体系及演化过程有利于粗碎屑和细碎屑交互沉积，形成较好的储盖组合，为柴达木盆地冷湖构造带下一步的油气勘探提供了可靠的地质依据.
Abstract:The Paleogene sedimentary system and evolution characteristics of Lenghu structural belt are studied based on the core observation, analysis of heavy mineral, logging data and seismic data of key exploratory wells in the west section of northern Qaidam Basin. The results indicate that the alluvial fan-braided river-braided river delta-lacustrine sedimentary system is developed in the Paleogene strata, with the provenance from the nearby Xiaosaishitengshan and Saishitengshan in the northeast. The braided river and braided river delta plain were mainly developed during the depositional stage of Paleogene Lulehe Formation (E1+2), with only a few alluvial fan deposits near the piedmont. There were mainly braided river, braided river delta plain, braided river delta front and shore-shallow lake deposits in the sedimentary period of Xiaganchaigou Formation (E3). The Paleogene Lenghu structural belt is shown as a large-scale transgression process with obvious vertical depositional inheritance, which well records the sedimentary evolution. The sedimentary system and evolution process are favorable for the alternating deposition of coarse and fine clastics and form good reservoir-cap association, which provides reliable geological basis for further oil-gas exploration in Lenghu structural belt of Qaidam Basin.
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Key words:
- sedimentary facies /
- sedimentary evolution /
- Lenghu structural belt /
- Qaidam Basin
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