石油与天然气地质 ›› 2018, Vol. 39 ›› Issue (6): 1164-1178.doi: 10.11743/ogg20180607

• 油气勘探 • 上一篇    下一篇

川西晚侏罗世前陆盆地浅水三角洲砂体分布特征与叠置模式

刘君龙1, 孙冬胜1, 纪友亮2, 朱宏权3, 于海跃2, 王天云4   

  1. 1. 中国石化 石油勘探开发研究院, 北京 100083;
    2. 中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249;
    3. 中国石化 西南油气分公司, 四川 成都 610081;
    4. 中国石油 东方地球物理公司 新兴物探开发处, 河北 涿州 072751
  • 收稿日期:2017-11-13 修回日期:2018-08-20 出版日期:2018-12-28 发布日期:2018-10-22
  • 通讯作者: 纪友亮(1962-),男,教授,石油地质学、沉积学和层序地层学。E-mail:ji_youliang@sina.com。 E-mail:ji_youliang@sina.com
  • 第一作者简介:刘君龙(1988-),男,博士后,沉积学、石油地质学。E-mail:jl_liu2007@sina.cn。
  • 基金项目:
    国家科技重大专项(2016ZX05002-006);国家自然科学基金项目(41672098)。

Distribution characteristics and superimposition pattern of the Late Jurassic shallow water deltic sand body in the foreland basin of Western Sichuan Depression

Liu Junlong1, Sun Dongsheng1, Ji Youliang2, Zhu Hongquan3, Yu Haiyue2, Wang Tianyun4   

  1. 1. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;
    2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Southwest Oil and Gas Branch Company of SINOPEC, Chengdu, Sichuan 610081, China;
    4. Xinxing Geophysical Prospecting Department, Bureau of Geophysical Prospecting INC., CNPC, Zhuozhou, Hebei 072751, China
  • Received:2017-11-13 Revised:2018-08-20 Online:2018-12-28 Published:2018-10-22

摘要: 基于高精度层序地层学理论,综合利用地震、测录井、岩心和分析化验等地质资料,阐明了发育在湖平面频繁变化背景下浅水三角洲的沉积特征,总结了砂体垂向叠置关系和平面分布规律,最后建立了浅水三角洲砂体叠置模式。研究结果表明:①分支河道和河口坝-滩坝叠覆体是蓬莱镇组浅水三角洲的主要成因砂体类型,平面上,分支河道呈树枝状,顺着物源方向展布,河口坝—滩坝叠覆体呈条带状,平行于岸线分布,纵向上,不同成因类型砂体相互叠置形成多种“复合砂体”类型。②从上游到下游,由于地形逐渐平缓,河流能量逐渐减弱,浅水三角洲分支河道的宽度和深度逐渐减小;低频的湖平面升降控制着浅水三角洲的进积和退积,高频的湖平面升降控制着浅水三角洲不同成因类型砂体的分布规律与叠置样式。③建立了川西晚侏罗世前陆盆地浅水三角洲沉积演化和4种砂体叠置模式,分别为低可容空间河道叠置、坝上河、高可容空间河道叠置和河口坝叠置。

关键词: 浅水三角洲, 沉积模式, 砂体分布规律, 侏罗纪, 四川盆地

Abstract: This study analyzed the sedimentary characteristics of shallow water deltic sand bodies grown with frequent changes of lake level,summarized their vertical superimposition relationship and areal distribution, and finally established their superimposition pattern,based on the theory of high resolution sequence stratigraphy,combined with a dataset consisting of seismic,logging,core and experiment data.Through analysis,we found that: ① distributary channels (CHs) and mouth bar-beach bar complexes are the main sand body types of the shallow water deltas in the Penglaizhen Formation.In the plan view,the distributary channels are mainly branch-shaped,distributing along the source direction,and MBCs are strip-shaped,parallel to the bank line;while vertically,sand bodies of different genetic types are superimposed into various types of composite sand bodies. ② As relief reduces gradually from the tectonically active margin to the basin, the stream energy decreases linearly with the gradient descent of the river system.Accordingly,the width and depth of the distributary channels of the shallow water delta decrease downwards.The low frequency lake level fluctuation controls the progradation and retrogradation of shallow water delta,whereas the change of high frequency lake levels determines the distribution and superimposition patterns of sand bodies of different genetic types. ③ The sedimentation evolution model of the Late Jurassic shallow water deltas in the foreland basin of Western Sichuan Depression was established,and four types of superimposition patterns for sand bodies there were classified,including superimposed low-accommodation channels, rivers over bar,superimposed high-accommodation channels and superimposed mouth bars.

Key words: shallow water delta, depositional model, distribution pattern of sand body, Jurassic, Sichuan Basin

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