准噶尔盆地车排子地区白垩系湖相沉积及滨岸线迁移规律  

Depositional facies and shoreline trajectories of Qingshuihe and Hutubi formations in the Chepaizi area,western Junggar Basin

作　　者：汪勇[1] 张学才 曹海防 侯帅军 张美[2] 陈林[2] 谢利华[3] 关旭同 张亚楠 Wang Yong;Zhang Xuecai;Cao Haifang;Hou Shuaijun;Zhang Mei;Chen Lin;Xie Lihua;Guan Xutong;Zhang Ya'nan(Western Oil and Gas Exploration Project Department,SINOPEC Shengli Oilfield Company,Dongying,Shandong 257000;Research Institute of Exploration and Development,SINOPEC Shengli Oilfield Company,Dongying,Shandong 257015;School of Earth and Space Sciences,Peking University,Beijing 100871)

机构地区：[1]中国石油化工股份有限公司胜利油田分公司西部油气勘探项目部,山东东营257000 [2]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [3]北京大学地球与空间科学学院,北京100871

出　　处：《地质科学》2025年第2期458-473,共16页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：新疆维吾尔自治区重大专项“新疆准噶尔铀成矿带成矿规律与勘查增储研究”资助。

摘　　要：准西车排子地区下白垩统清水河组—呼图壁组是准噶尔盆地的主要油气勘探目的层,但对其层序和沉积演化仍存在认识分歧,且对滨岸线的迁移缺乏整体系统的研究。建立滨岸线迁移与沉积体系的成因关联,可预测古环境和岩性分布。明确准西地区清水河组—呼图壁组四级层序地层格架下滨岸线迁移及其控制的沉积分布演化,对准西地区勘探开发具有重要的指导意义。综合利用录井、岩心、测井、地震资料及野外露头等资料,结合区域地质背景,将清水河组及呼图壁组分为两个三级层序,各分为3个四级层序。清水河组一段位于三级层序的低位域,滨岸线最低,物源供应充足,车排子地区扇三角洲分布范围较广,陡坡带沟道分布扇三角洲平原辫状河道或水下分流河道,向湖缓坡带分布扇三角洲水下分流河道及前缘砂坝;准西南缘平缓的开阔滨湖带广泛分布较厚的滨湖砾石滩坝;车排子古隆起南延的水下隆起处分布滨湖滩坝。清水河组二段和三段分别位于三级水侵体系域和高位体系域,滨岸线向岸迁移,车排子地区扇三角洲向湖岸后退,晚期,滨岸线向湖迁移,扇三角洲进积。呼图壁组一段和二段位于三级低位—水侵体系域,相对湖平面上升,滨岸线继续向岸迁移,物源供应相对不足,继承了清水河组沉积时期的古地貌和沉积相类型。呼三段位于三级层序的高位体系域,沉积早期滨岸线向岸迁移,沉积晚期向湖迁移,物源供应严重不足,仅在车排子隆起东缓坡带平行岸线分布窄条带状的细粒且薄的滨湖滩坝。滨岸线迁移、沉积物供应及古地貌共同控制了车排子地区白垩系层序结构、沉积相类型和分布。The Lower Cretaceous Qingshuihe and Hutubi formations are the main producing stratums in the western Junggar Basin.However,there are still different opinions on its sequence and sedimentary evolution,and there is no overall and systematic study on the shoreline trajectories.Establishing the genetic correlation between shoreline trajectories and sedimentary systems can predict the distribution of paleoenvironment and lithology.It is of great guiding significance for the exploration and development of the western Junggar Basin to clarify the shoreline migration under the fourth sequence stratigraphic framework of Qingshuihe and Hutubi formations and its controlled sedimentary distribution and evolution.Qingshuihe and Hutubi formations have two third‑order sequences that are divided into three fourth‑order sequences respectively.The first member of the Qingshuihe Formation is in the lowstand system tracts of the third‑order sequence,with the lowest shoreline and sufficient source supply.The fan delta is widely distributed in the Chepaizi area,the braided channel or distributary channel in the steep slope zone is distributed in the fan delta plain,and the fan delta distributary channel and front sand bar are distributed in the gentle slope zone of the lake.The thick gravel beach bars are distributed widely in the flat open lakeshore zone in the southwest margin.Meanwhile,lakeshore beach bar is distributed widely in the southern uplift of the Chepaizi paleouplift.The second and third members of the Qingshuihe Formation are in the third‑order transgressive system tracts and highstand system tracts,respectively.The shoreline moves toward the shore,and the fan deltas in the Chepaizi area are regressive with the lake level rising.In the late stage,the shoreline moves towards the lake and the fan deltas are progradation.The first and second members of Hutubi Formation are located in the third‑order lowstand system tracts.The relative lake level and the shoreline continue to move toward the shore.At the same time,

关 键 词：滨岸线迁移 砂质滩坝 砾石滩坝 扇三角洲 层序地层 清水河组—呼图壁组 

分 类 号：TE122.2[石油与天然气工程—油气勘探]