岩性油气藏 ›› 2026, Vol. 38 ›› Issue (5): 125–135.doi: 10.12108/yxyqc.20260512

• 地质勘探 • 上一篇    下一篇

鄂尔多斯盆地延安—甘泉地区山23亚段大型河道带沉积特征及勘探潜力

樊宇洁1,2(), 万永平3, 蒲仁海2(), 折印楠3, 崔宏俊4, 高小平3   

  1. 1 中海油能源发展股份有限公司工程技术分公司 中海油监督中心， 天津 300450
    2 西北大学 地质学系， 西安 710069
    3 陕西延长石油(集团)有限责任公司气田公司， 西安 716000
    4 陕西延长石油(集团)有限责任公司气田公司 采气一厂， 西安 710000
  • 收稿日期:2026-02-28 修回日期:2026-05-09 出版日期:2026-09-01 发布日期:2026-09-04
  • 第一作者:樊宇洁（1999—），男，初级工程师，主要从事油气勘探开发研究。地址：（300450）天津市滨海新区海川路2121号渤海石油管理局C座。Email:fanyj6@cnooc.com.cn。
  • 通信作者: 蒲仁海
  • 基金资助:
    陕西省重点研发计划项目“延长探区含气预测”(2022GY-140)

Sedimentary characteristics and exploration potential of the large-scale channel belt in Shan23 submember of Yan’an-Ganquan area, Ordos Basin

FAN Yujie1,2(), WAN Yongping3, PU Renhai2(), SHE Yinnan3, CUI Hongjun4, GAO Xiaoping3   

  1. 1 CNOOC Supervision & Consultancy Center, Engineering Technology Branch of CNOOC Energy Technology & Services Limited, Tianjin 300450, China
    2 Department of Geology, Northwest University, Xi’an 710069, China
    3 Gasfield Company, Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi’an 716000, China
    4 No. 1 Gas Production Plant, Yanchang Petroleum(Group) Co., Ltd., Xi’an 710000, China
  • Received:2026-02-28 Revised:2026-05-09 Online:2026-09-01 Published:2026-09-04
  • Contact: PU Renhai E-mail:fanyj6@cnooc.com.cn;purenhai@126.com

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摘要：

基于三维地震、测井、岩心及野外露头资料，对鄂尔多斯盆地延安—甘泉地区山23亚段沉积特征、砂体展布、烃源岩分布、沉积相模式等进行了系统分析，明确了勘探潜力。研究结果表明：①延安—甘泉地区山23亚段为海陆交互相沉积背景，整体为弱还原沉积环境，水动力条件分异明显，沉积体系以三角洲平原为主，局部发育三角洲前缘，沉积微相主要为分流河道，其次为水下分流河道、分流间湾，局部见沼泽与席状砂；砂体多期叠置、横向连通性较好，自北向南逐渐尖灭。②研究区山23亚段砂体展布表现为一条南北向大型河道带，宽10~15 km，长50~60 km；河道带内砂体发育规模大，厚15~20 m，多由2~3层砂岩叠置构成，中间厚、向东西两侧减薄；河道带外砂体多为薄层砂岩叠置，厚度为5~7 m；山23亚段砂体厚度与太原组厚度呈此消彼长关系。③研究区烃源岩以煤层和暗色泥岩为主，其分布受河道带控制，具有河道带内外差异、南北分异特征，在河道带内零星发育、外侧富集，呈南厚北薄特征。④研究区沉积相模式为，太原组沉积后期大规模海退，南北向河流—三角洲物源体系向盆地东南部推进，强烈冲刷太原组灰岩，区域中部山23亚段发育大型三角洲平原分流河道带；东西两侧低洼区海水残留形成湖泊或沼泽，接受分支河道碎屑沉积，形成沼泽相与小规模三角洲前缘水下分流河道沉积体系。

关键词: 分流河道带, 沉积相, 三角洲平原—前缘, 测井相, 烃源岩, 山23亚段, 太原组, 延安—甘泉地区, 鄂尔多斯盆地

Abstract:

Based on 3D seismic, logging, core and field outcrop data, sedimentary characteristics, sand body distribution, source rock distribution and sedimentary facies models of Shan2³ submember in Yan’an-Ganquan area of Ordos Basin were systematically analyzed, and the exploration potential was clarified. The results show that: （1） Shan2³ submember in Yan’an-Ganquan area was deposited under a marine-continental transitional setting, with a weak reducing sedimentary environment and obvious differentiation of hydrodynamic conditions. Its sedimentary system is dominated by delta plains, locally develops delta front. Sedimentary microfacies are mainly distributary channels, followed by underwater distributary channels and interdistributary bays,with marshes and sheet sands locally observed. Sand bodies are superimposed in multiple stages with good lateral connectivity, and gradually pinch out from north to south. （2） The distribution of sand bodies of Shan2³ submember in the study area exhibits a large north-south trending channel belt, with a width of 10-15 km and a length of 50-60 km. Within the channel belt, sand bodies are developed on a large scale, with a thickness of 15-20 m,and mostly composed of 2 to 3 superimposed sandstone layers, thick in the central part and thinning toward the east and west sides. Outside the channel belt, sand bodies are mostly superimposed thin-layer sandstones, with thicknesses of 5-7 m. The thickness of Shan2³ submember sand bodies shows an inverse correlation with that of Taiyuan Formation. （3） Source rocks in the study area are mainly coal seams and dark mudstones. Their distribution is controlled by the channel belt, showing spatial differences both inside and outside the channel belt as well as north-south differentiation. Source rocks are sporadically developed within the channel belt but enriched on its flanks, showing thickness pattern of thick in the south and thin in the north. （4） The sedimentary facies model of Shan2³ submember in the study area is as follows: In the late depositional stage of Taiyuan Formation, large-scale regression occurred, the north-south trending fluvial-deltaic provenance system advanced towards southeastern Ordos Basin and intensely scoured the limestone of Taiyuan Formation, developing a large delta plain distributary channel belt in Shan2³ submember in the central part of the region. Residual seawater in low-lying areas on the east and west sides formed lakes and marshes,which received clastic sediments from tributary channels, forming a sedimentary system of marsh facies and small-scale delta front underwater distributary channel.

Key words: distributary channel belt, sedimentary facies, delta plain-delta front, logging facies, source rock, Shan2³ submember, Taiyuan Formation, Yan’an-Ganquan area, Ordos Basin

中图分类号: 

  • TE121.3

图1

鄂尔多斯盆地延安—甘泉地区构造位置（a），北部1#井区三维地震区山23亚段砂岩厚度平面展布特征（b）及岩性地层综合柱状图（c）"

图2

鄂尔多斯盆地东缘山23亚段野外剖面图及延安—甘泉地区山23亚段砂岩沉积构造照片 （a） 山23亚段底部发育大段砂岩，与底部太原组灰岩突变接触，兴县关家崖剖面；（b） 山23亚段底部发育槽状交错层理，柳林成家庄剖面；（c） 深灰色砂岩，低角度斜层理，底部发育少量煤层，2#井，2 735.77~2 735.87 m；（d） 深灰色砂岩，发育不规则黑色泥质条带，2#井，2 735.05~2 735.15 m；（e） 灰色砂岩，块状层理，3#井，2 499.38~2 499.50 m；（f） 灰色砂岩，交错层理，3#井，2 542.88~2 543.00 m；（g） 灰黑色砂岩，见多条煤线，斜层理，发育少量泥质条带，4#井，2 835.66~2 835.77 m；（h） 灰色砂岩，斜层理，5#井，2 528.35~2 528.48 m；（i） 浅灰色砂岩，块状层理，少量黑色泥质条带，5#井，2 587.46~2 587.80 m。"

图3

鄂尔多斯盆地延安—甘泉地区山23亚段砂岩粒度累计概率曲线"

图4

鄂尔多斯盆地延安—甘泉地区山23亚段测井相图版"

图5

鄂尔多斯盆地延安—甘泉地区9#井山西组二段测井相-沉积相"

图6

鄂尔多斯盆地延安—甘泉地区10#井山西组二段测井相-沉积相"

图7

鄂尔多斯盆地延安—甘泉地区北部垂直物源方向山23亚段连井沉积相剖面（剖面位置见图9a中AA'）"

图8

鄂尔多斯盆地延安—甘泉地区顺物源方向山23亚段沉积相剖面（剖面位置见图9a中BB'）"

图9

鄂尔多斯盆地延安—甘泉地区山23亚段砂岩厚度（a）、砂地比（b）平面展布特征"

图10

鄂尔多斯盆地延安—甘泉地区山23亚段砂体叠置剖面（剖面位置见图9b中CC'）"

图11

鄂尔多斯盆地延安—甘泉地区二叠系太原组厚度平面分布特征"

图12

鄂尔多斯盆地延安—甘泉地区山23亚段煤层（a）、暗色泥岩（b）厚度平面展布特征"

图13

鄂尔多斯盆地延安—甘泉地区山23亚段沉积模式"

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