岩性油气藏 ›› 2019, Vol. 31 ›› Issue (4): 13–20.doi: 10.12108/yxyqc.20190402

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地南缘下寒武统地层划分及沉积演化特征

王宏波1, 郭玮2,3, 章贵松2,3, 井向辉2,3, 李相博1, 王菁1   

  1. 1. 中国石油勘探开发研究院 西北分院, 兰州 730020;
    2. 中国石油长庆油田分公司 勘探开发研究院, 西安 710018;
    3. 低渗透油气田勘探开发国家工程实验室, 西安 710018
  • 收稿日期:2019-03-25 修回日期:2019-05-05 出版日期:2019-07-21 发布日期:2019-06-21
  • 第一作者:王宏波(1975-),男,博士,高级工程师,主要从事石油地质与沉积学方面的研究工作。地址:(730020)甘肃省兰州市城关区雁儿湾路535号。Email:wang_hb1@petroChina.com.cn。
  • 基金资助:
    中国石油天然气股份有限公司重大科技专项"长庆油田5000万吨持续高效稳产关键技术研究与应用"（编号：2016E-0502）资助

Stratigraphic division and sedimentary evolution characteristics of Lower Cambrian in the southern margin of Ordos Basin

WANG Hongbo1, GUO Wei2,3, ZHANG Guisong2,3, JING Xianghui2,3, LI Xiangbo1, WANG Jing1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    3. National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi'an 710018, China
  • Received:2019-03-25 Revised:2019-05-05 Online:2019-07-21 Published:2019-06-21

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摘要： 为研究鄂尔多斯盆地南缘下寒武统的地层发育特征与沉积演化规律，开展了大地构造背景分析、地层对比和岩相古地理研究。结果表明：①鄂尔多斯盆地南缘辛集组之下发育东坡组和罗圈组地层，为主要烃源岩系，可归属到下寒武统，TOC质量分数为0.19%~11.18%，平均为3.14%，为寒武系最优质的烃源岩。②整个华北地区在早寒武世早期发生海侵，沉积了一套海进地层，鄂尔多斯盆地南缘经历了深水海湾沉积、海岸沉积和碳酸盐岩缓坡沉积过程。③鄂尔多斯盆地南缘寒武系沉积厚度为500~1 300 m，局部可达1 500 m以上，其中张夏组鲕粒滩分布广泛，发育溶孔和晶间孔，为相对优质的储集体，与东坡组和罗圈组构成了良好的源储组合。该研究成果对鄂尔多斯盆地寒武系油气勘探具有重要意义。

关键词: 地层划分, 沉积演化, 东坡组, 罗圈组, 下寒武统, 鄂尔多斯盆地南缘

Abstract: In order to study the stratigraphic development and sedimentary evolution of Lower Cambrian in the southern margin of Ordos Basin,geotectonic background,stratigraphic correlation and lithofacies palaeogeography were studied. The results show that:(1)Dongpo Formation and Luoquan Formation are the main source rocks developed under Xinji Formation in the southern margin of Ordos Basin,which can be classified into Lower Cambrian. The TOC mass fraction is 0.19%-11.18%,with an average of 3.14%,so they are the best source rocks of Cambrian.(2)The entire North China region transgressed in the early Early Cambrian and deposited a set of transgression strata. The southern margin of Ordos Basin underwent deep-water bay deposition,coastal deposition and carbonate gentle slope deposition.(3)The sedimentary thickness of Cambrian in the southern margin of Ordos Basin is 500-1 300 m,and it can reach more than 1 500 m locally. The oolitic shoals of Zhangxia Formation are widely distributed,with dissolved pores and intergranular pores developed. They are relatively high-quality reservoirs and form a good source-reservoir assemblage with Dongpo Formation and Luoquan Formation. The research results are of great significance to the Cambrian oil and gas exploration in Ordos Basin.

Key words: stratigraphic division, sedimentary evolution, Dongpo Formation, Luoquan Formation, Lower Cambrian, southern margin of Ordos Basin

中图分类号: 

  • TE121.3
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