岩性油气藏 ›› 2021, Vol. 33 ›› Issue (6): 59–69.doi: 10.12108/yxyqc.20210607

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地平凉北地区长8油藏特征及成藏主控因素

邵晓州1,2,3, 王苗苗4, 齐亚林2,3, 贺彤彤5, 张晓磊2,3, 庞锦莲2,3, 郭懿萱2,3   

  1. 1. 成都理工大学 能源学院, 成都 610059;
    2. 低渗透油气田勘探开发国家工程实验室, 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. 长安大学 公路学院, 西安 710064;
    5. 中国石油长庆油田分公司 第九采油厂, 银川 750006
  • 收稿日期:2021-04-19 修回日期:2021-06-20 出版日期:2021-12-01 发布日期:2021-11-25
  • 第一作者:邵晓州(1985-),男,成都理工大学在读博士研究生,研究方向为石油地质综合研究。地址:(710018)陕西省西安市未央区凤城四路兴隆园小区。Email:shxzh1@163.com
  • 通信作者: 王苗苗(1986-),女,博士,讲师,主要从事工程地质方面的教学与科研工作。Email:wmmcugb@163.com。
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”（编号：2017ZX05001002）和“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”（编号：2016ZX05050）联合资助

Characteristics and main controlling factors of Chang 8 reservoir in northern Pingliang area,Ordos Basin

SHAO Xiaozhou1,2,3, WANG Miaomiao4, QI Yalin2,3, HE Tongtong5, ZHANG Xiaolei2,3, PANG Jinlian2,3, GUO Yixuan2,3   

  1. 1. College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China;
    2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China;
    3. Research Institute of Exploration and Development, PetroChina Changing Oilfield Company, Xi'an 710018, China;
    4. School of Highway, Chang'an University, Xi'an 710064, China;
    5. No.9 Oil Production Plant, PetroChina Changqing Oilfield Company, Yinchuan 750006, China
  • Received:2021-04-19 Revised:2021-06-20 Online:2021-12-01 Published:2021-11-25

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摘要： 鄂尔多斯盆地平凉北地区延长组长8油层组是增储上产的重要层系，油水关系复杂，成藏控制因素多样。通过原油特征、地层水性质、储层薄片、压汞实验、地震解释等资料，结合烃源岩地球化学、流体包裹体、纳米CT等测试技术，对该地区长8油藏特征及控制因素进行了研究。结果表明：平凉北地区长8油藏原油密度和黏度较大，整体流动性较差，成熟度较好，地层水以CaCl2型为主，平均矿化度为37.45 g/L，保存条件较好。上部紧邻的长7泥页岩TOC质量分数平均为4.89%，氯仿沥青“A”平均值为0.51%，w（S1+S2）平均值为17.11 mg/g，具有较好的生烃能力。长8储层储集空间以粒间孔、长石溶孔为主，物性好，非均质性较强。受区域多期构造运动作用影响，形成了凹隆相间的构造格局，整体呈“马鞍”状构造形态，低幅度鼻隆构造发育。平凉北地区长8油藏属“近源成藏”，长7烃源岩生成的油气通过砂体、裂缝、断层等运移到长8有利圈闭中，发育岩性、构造-岩性和岩性-构造3种类型的油藏。烃源岩品质、储层物性好坏、低幅度圈闭大小是控制该区长8油藏分布的主要因素。

关键词: 油藏特征, 油气成藏, 主控因素, 长8油藏, 平凉北地区, 鄂尔多斯盆地

Abstract: The Chang 8 reservoir of Yanchang Formation is an important stratum for increasing reserves and production in northern Pingliang area, Ordos Basin, and the oil-water relationship is complex, meanwhile the controlling factors of reservoir accumulation are diverse. Based on the data of crude oil characteristics, formation water properties, reservoir thin section, mercury injection experiment and seismic interpretation, combined with the testing technologies of source rock geochemistry, fluid inclusion and nano CT, the characteristics and controlling factors of Chang 8 reservoir in the study area were studied. The results show Chang 8 crude oil has high density and viscosity, poor overall fluidity and good maturity, and the formation water is mainly type CaCl2, with an average salinity of 37.45 g/L and good preservation conditions. The average TOC content of Chang 7 shale is 4.89%, average chloroform asphalt “A” is 0.51%, and average w (S1+S2) is 17.11 mg/g, with good hydrocarbon generation capacity. Chang 8 reservoir is mainly composed of intergranular pores and feldspar dissolved pores, with good physical properties and strong heterogeneity. Under the influence of regional multi-stage tectonic movement, a structural pattern of alternating concave and uplifts was formed, with saddle-shaped structure and low amplitude nose uplift structure. The Chang 8 reservoir in northern Pingliang area belongs to “near source accu-mulation”. The oil and gas generated by Chang 7 source rocks migrated to Chang 8 favorable traps through sandbodies, fractures and faults, forming lithologic, structural-lithologic and lithologic-structural reservoirs of different scales. The quality of source rocks, reservoir physical properties and low amplitude traps are the main factors controlling the distribution of Chang 8 reservoir in the study area.

Key words: reservoir characteristics, hydrocarbon accumulation, main controlling factors, Chang 8 reservoir, northern Pingliang area, Ordos Basin

中图分类号: 

  • TE122.1
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