摘要
柴达木盆地西部红三旱一号—牛鼻子梁地区在路乐河组沉积时期的物源方向和沉积体系类型尚不明确。通过岩心观察、砂岩骨架组分和重矿物类型及其组合特征分析、连井砂体对比、古地理背景分析等方法,对该区路乐河组沉积时期的物源方向和沉积体系类型及其展布进行了研究。结果表明,红三旱一号物源分为3支水系,自西向东依次为尖顶山水系、长尾梁水系和碱北水系;尖顶山水系经红三旱一号一高点主体向西南方向流入尖顶山地区,长尾梁水系经红三旱一号三高点主体向南偏西方向流入长尾梁地区,碱北水系经红三旱一号五高点主体向东南方向流入碱山以北地区。牛鼻子梁西口物源主体向东南方向流入伊北凹陷。在路乐河组沉积时期研究区发育由红三旱一号物源和牛鼻子梁西口物源共同控制形成的扇三角洲—滨浅湖沉积体系。其扇三角洲平原亚相的分布面积较大,向南延伸至尖顶山—黑梁子地区以北、东坪北部以及牛参1井以南;扇三角洲前缘亚相的分布面积较小,向南延伸至长尾梁地区。
The Hongsanhanyihao and Niubiziliang area developed two provenance systems which controlled the fan delta and shallow lake sedimentary system in western Qaidam basin. By means of the core observation, the sandstone framework component character, the type of the heavy mineral and their assemblages features, several wells are joined together to compare the sand, and analyze the paleo-geographic settings of Lulehe formation in the Honganhanyihao and Niubiziliang area. The provenance system and sedimentary system are studied comprehensively. The results show that this area developed fan delta in the shallow lake which is controlled by the Hongsanhanyihao sedimentary provenance and the west valley of the Niubiziliang sedimentary provenance in the time of the Lulehe for mation. The Hongsanhanyihao sedimentary provenance is consisted of three embranchments: firstly, Jiandingshan water system, which mainly flowed southwest into Jiandingshan area by the first high point of the Hongsanhanyihao, secondly, the Changweiliang water system, which mainly flowed south into Changweiliang area by the third high point of the Hongsanhanyihao, and thirdly, Jianbei water system, which mainly flowed southeast into the north of Jianshan area by the fifth high point of the Hongsanhanyihao. And, the west valley of the Niubiziliang sedimentary provenance mainly flowed southeast to the east of the Jianshan area.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2013年第5期19-22,112,共4页
Petroleum Geology and Recovery Efficiency
基金
中国石油天然气股份有限公司科学研究与技术开发项目"柴达木盆地油气勘探开发关键技术研究"(07-01z-01-02)
关键词
重矿物
古地理背景
物源
沉积体系
路乐河组
柴达木盆地
heavy mineral
paleo-geographic setting
provenance system
sedimentary system
Lulehe formation
Qaidam basin
