岩性油气藏 ›› 2025, Vol. 37 ›› Issue (2): 115–126.doi: 10.12108/yxyqc.20250211

• 地质勘探 • 上一篇    

准噶尔盆地永进地区侏罗系齐古组浅水辫状河三角洲沉积特征

胡鑫1,2, 朱筱敏1,2, 金绪铃1,2, 黄成1,2, 周越1,2, 程长领3, 修金磊3, 任新成3   

  1. 1. 中国石油大学(北京)油气资源与工程国家重点实验室, 北京 102249;
    2. 中国石油大学(北京)地球科学学院, 北京 102249;
    3. 中国石化胜利油田分公司 勘探开发研究院, 山东 东营 257000
  • 收稿日期:2024-06-11 修回日期:2024-08-16 发布日期:2025-03-06
  • 第一作者:胡鑫(1998—),男,中国石油大学(北京)在读博士研究生,研究方向为源汇系统和地震沉积学。地址:(102249)北京市昌平区府学路18号。Email:2625940018@qq.com。
  • 通信作者: 朱筱敏(1960—),男,博士,教授,主要从事层序地层学和沉积学方面的教学与科研工作。Email:xmzhu@cup.edu.cn。
  • 基金资助:
    国家自然科学基金“湖盆扇三角洲前缘河口坝构型及形成机组研究”(编号:42272110)资助。

Sedimentary characteristics of the shallow-water braided river delta of Jurassic Qigu Formation in Yongjin area, Junggar Basin

HU Xin1,2, ZHU Xiaomin1,2, JIN Xuling1,2, HUANG Cheng1,2, ZHOU Yue1,2, CHENG Changling3, XIU Jinlei3, REN Xincheng3   

  1. 1. China University of Petroleum(Beijing), National Laboratory of Oil and Gas Resources and Engineering, Beijing 102249, China;
    2. School of Earth Sciences, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Research Institute of Exploration and Development, Shengli Oilfield, Sinopec, Dongying 257000, Shandong, China
  • Received:2024-06-11 Revised:2024-08-16 Published:2025-03-06

摘要: 基于地震沉积学理论指导,综合利用岩心、测井和地震资料,运用90°相移、属性聚类、RGB属性融合、地层切片和波形指示模拟等技术,恢复了准噶尔盆地永进地区侏罗系齐古组沉积演化历史,并定量表征了齐古组薄层砂体的时空分布规律,构建了不同层序格架下的沉积演化模式。研究结果表明:①准噶尔盆地永进地区侏罗系齐古组沉积时期发育浅水辫状河三角洲前缘亚相。在低位体系域沉积时期,前缘水下分流主河道发育,河道砂体宽且连续性较强,沉积序列多见无泥岩夹层的间断正韵律;在湖侵体系域沉积时期,前缘次级河道发育,河道砂体窄且呈断续分布,沉积序列多见有泥岩夹层的间断正韵律。②永进地区齐古组呈由北向南的楔状展布,砂体厚度为32~48 m,平均厚度为35 m。在低位体系域沉积时期,砂体为复合砂体叠置发育,厚层且连通性较好;在湖侵体系域沉积时期,则以单砂体发育为主,厚度较小且连通性较差。③永进地区齐古组浅水三角洲前缘河道砂体的平面展布形态受到古地貌形态和湖平面升降变化的控制,形成2类水下分流河道砂体,浅水辫状河三角洲前缘在低位体系域呈枝状展布,在湖侵体系域呈网状展布。

关键词: 地震属性, 波形指示模拟, 地层切片, 浅水辫状河三角洲, 古地貌, 湖平面升降, 齐古组, 侏罗系, 永进地区, 准噶尔盆地

Abstract: Based on seismic sedimentology theory,the core,logging and seismic data are comprehensively utilized to recover evolution history of Jurassic Qigu Formation in the Yongjin area of Junggar Basin,to quantitatively characterize the temporal and spatial distribution pattern of the thin-layered sands in the Qigu Formation,and construct sedimentary evolution models under different stratigraphic grids,by using the techniques of 90°phase-shift,attribute clustering,RGB attribute fusion,stratigraphic slicing,and waveform-indicating simulation. The results show that :(1)Jurassic Qigu Formation in the Yongjin area of Junggar Basin developed shallow-water braided river delta front subfacies. During the lowstand tract system,the main channel of subaqueous diversion was developed at the front margin,the sand body of the river channel was wide and continuous,and the sedimentary sequence mostly showed intermittent positive rhythms without mudstone interlayers;during the lacustrine transgressive system tract,the secondary channel was developed at the front margin,the sand body of the river channel was narrow and intermittently distributed,and the sedimentary sequence mostly showed intermittent positive rhythms with mudstone interlayers.(2)The stratigraphy of the Qigu Formation in Yongjin area is spreading like a wedge from north to south,and the thickness of the sand body is between 32-48 m,with an average thickness of 35 m. During the period of the lowstand tract system,the sand body shows the development of composite sand body superposition,with a thick layer and good connectivity;during the period of the lacustrine transgressive system tract,the development of a single sand body is dominated,with a thin thickness and poor connectivity.(3)The planar spreading pattern of the river sand body in front of the shallow delta of the Qigu Formation in the Yongjin area is controlled by the paleomorphic pattern and the change of lake level rise and fall, to form two types of subaqueous diversionary river sand bodies,the front edge of the shallow braided river delta in the low level system domain is in the form of a branch,and in the lake intrusion system domain is in the form of a net spreading pattern.

Key words: seismic attribute, waveform-indicating simulation, stratigraphic slices, shallow braided river delta, paleogeomorphology, lake level rise and fall, Qigu Formation, Jurassic, Yongjin area, Junggar Basin

中图分类号: 

  • TE121
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