岩性油气藏 ›› 2019, Vol. 31 ›› Issue (2): 16–23.doi: 10.12108/yxyqc.20190203

• 油气地质 • 上一篇    下一篇

姬塬地区长81亚油层组浅水型三角洲砂体结构及成因

刘桂珍1, 高伟2, 张丹丹3, 陈龙4, 李爱荣1   

  1. 1. 西安石油大学 地球科学与工程学院, 西安 710065;
    2. 中国石油长庆油田分公司 油气工艺研究院, 西安 710018;
    3. 中国石油长庆油田分公司 勘探开发研究院, 西安 710018;
    4. 中国石油长庆油田分公司 第三采油厂, 银川 750006
  • 收稿日期:2018-09-25 修回日期:2018-12-13 出版日期:2019-03-21 发布日期:2019-03-21
  • 作者简介:刘桂珍(1976-),女,博士,讲师,主要从事沉积学与储层地质学的教学和科研工作。地址:(710065)陕西省西安市雁塔区电子二路东段18号。Email:liuguizhen509@xsyu.edu.cn。
  • 基金资助:
    国家自然科学基金项目“湖盆深水砂岩中碳酸盐胶结物成因及分布规律：以鄂尔多斯盆地延长组为例”（编号：41602156）和“鄂尔多斯盆地南部长6油层组地层水特征与油气富集规律研究”（编号：41772140）联合资助

Sandbody structure and its genesis of shallow-water delta of Chang 81 reservoir in Jiyuan area,Ordos Basin

LIU Guizhen1, GAO Wei2, ZHANG Dandan3, CHEN Long4, LI Airong1   

  1. 1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Research Institute of Oil & Gas Technology, PetroChina Changqing Oilfield Company, Xi'an 710021, China;
    3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    4. No.3 Oil Production Plant, PetroChina Changqing Oilfield Company, Yinchuan 750006, China
  • Received:2018-09-25 Revised:2018-12-13 Online:2019-03-21 Published:2019-03-21

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摘要： 鄂尔多斯盆地姬塬地区长8油层组为浅水三角洲沉积，其储层具有横向变化快、非均质性强的特征。为了更好地表征储层非均质性，预测储层甜点区的分布，基于岩心资料和测井资料，结合现代沉积分析，对鄂尔多斯盆地姬塬地区长81亚油层组的砂体结构特征、成因和分布规律进行了研究。结果表明：研究区长81亚油层组砂体结构类型主要有4种，即叠合箱型（包括块状叠合箱型和层状叠合箱型）、齿化钟型、孤立箱型和孤立指状，其中叠合箱型、齿化钟型均表现为多期分流河道砂体叠置，是研究区主要的含油砂体；砂体结构成因、类型及分布与古构造、古地貌、基准面旋回、物源供给和古气候等相关。结合鄱阳湖现代三角洲沉积特征分析表明，研究区砂体为分流河道沉积，具有垂向交错叠置、平面连片分布的特征，该认识对鄂尔多斯盆地延长组油气勘探与开发具有参考价值。

关键词: 砂体结构, 浅水三角洲, 长81亚油层组, 姬塬地区, 鄂尔多斯盆地

Abstract: Chang 8 oil reservoir set of Yanchang Formation in Ordos Basin belongs to shallow-water delta deposit, of which the reservoir changes rapidly and has strong heterogeneity. To identify the characteristics of reservoir heterogeneity and predict reservoir sweet spot in Jiyuan area,studies were performed on the structure characteristics,genesis and distribution of sandbodies of Chang 8 1 reservoir by using data from coring and well logging and modern sedimentary cases. The results show that there are four types of sandbody structure in this area,including composite funnel (block composite funnel and layered composite funnel),zigzag bell-shaped,isolated box and isolated finger sandbody structure. The former two types of sandbody structure are vmultiple superimposed by distributary channel and were the main oil-bearing sandbodies. The origin,type and distribution of sandbody structure are related to palaeotectonics,paleogeomorphology,base-level cycles,sediment supply and palaeoclimate. Based on the characteristics of modern shallow delta sedimentation in Poyang Lake delta,the sandbodies in the study area are multistage distributary channel deposition,which have the characteristics of superimposed reservoir vertically and sheet distribution in horizontal. This understanding will be helpful to oil and gas exploration and development of Yanchang Formation in Ordos Basin.

Key words: sandbody structure, shallow-water delta, Chang 81 reservoir, Jiyuan area, Ordos Basin

中图分类号: 

  • TE121.3
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