新疆石油地质

›› 2017, Vol. 38 ›› Issue (6): 1-1.doi: 10.7657/XJPG20170609

• 论文 •    

博格达山周缘芦草沟组混合沉积控制因素及模式

王越1，2，张奎华1，林会喜1，陈世悦3，张关龙1，汪誉新1   

  1. (1.中国石化 胜利油田分公司 勘探开发研究院,山东 东营 257015;2.胜利石油管理局 博士后科研工作站, 山东 东营 257000;3.中国石油大学 地球科学与技术学院,山东 青岛 266580)
  • 出版日期:2019-01-01 发布日期:1905-07-18

Controlling Factors and Model of Mixed Deposits of Lucaogou Formation on the Periphery of Bogda Mountain

WANG Yue1,2, ZHANG Kuihua1, LIN Huixi1, CHEN Shiyue3, ZHANG Guanlong1, WANG Yuxin1   

  1. (1.Research Institute of Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying, Shandong 257015, China; 2.Postdoctoral Scientific Research Station, Shengli Petroleum Administration Bureau, Dongying, Shandong 257000, China; 3.School of Geosciences, China University of Petroleum, Qingdao, Shandong 266580, China)
  • Online:2019-01-01 Published:1905-07-18

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摘要： 通过岩心、露头观察及薄片鉴定等方法研究认为，博格达山周缘中二叠统芦草沟组主要发育近岸水下扇和湖泊沉积，其中混合沉积主要分布在近岸水下扇扇缘和半深湖—深湖。在近岸水下扇扇缘发育由砾岩、砂岩、内碎屑灰岩和泥岩以及砾岩、砾质泥晶灰岩和泥岩构成的2种混积层系；在半深湖—深湖发育由灰质粉砂岩和页岩以及页岩、泥晶白云岩和泥晶灰岩构成的2种混积层系。Sr/Cu值表明研究区芦草沟组具有以炎热干旱气候为主、间歇性出现温暖湿润气候的特征，2种气候交替出现是混积岩、混积层系广泛发育的根本原因。构造运动主要通过控制研究区盆地的属性来影响芦草沟组混合沉积相类型及特征，湖平面升降与物源供给进一步控制了陆源碎屑与碳酸盐组分的混积形式。在分析研究区混合沉积特征及控制因素的基础上，结合岩石、岩石组合及沉积构造等特征，建立了芦草沟组的混合沉积模式。

Abstract: Researches on core, outcrop observation and thin section identification show that near-shore underwater fan and lacustrine deposits are mainly found in the Middle Permian Lucaogou formation on the periphery of Bogda Mountain, and mixed deposits are mainly distributed in the margin of the near-shore underwater fan and semi-deep—deep lakes. 2 kinds of mixed depositional sequences that consist of conglomerate, sandstone, intraclast limestone and mudstone, and conglomerate, conglomeratic micrite and mudstone, respectively are developed in the margin of the near-shore underwater fan; the other two mixed depositional sequences that consist of limy siltstone and mudstone, and mudstone, micritic dolomite and micrite, respectively are developed in semi-deep—deep lakes. Sr/Cu ratio indicates that the depositional stage of Lucaogou formation in the study area was dominated by tropical and dry climate with intermittent warm and humid climate, the alternation of the 2 climates was the root cause of the wide development of the mixed rocks and mixed sequences. Tectonic movement controls the properties of the basin in the study area, which influences the type and characteristics of the mixed sedimentary facies in Lucaogou formation, and the rise and fall of lake level and the supply of sediment sources further control the mixing of terrigenous clastics with carbonate components. On the basis of the study on the characteristics and the controls on the mixed deposits and combining the characteristics of rock, rock assemblage and sedimentary structures, the paper establishes a model of the mixed deposits of Lucaogou formation.

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