油气藏评价与开发 ›› 2022, Vol. 12 ›› Issue (1): 192-203.doi: 10.13809/j.cnki.cn32-1825/te.2022.01.017

• 页岩油 • 上一篇    下一篇

准噶尔盆地吉174井芦草沟组页岩油地质剖面分析

王然(),何文军,赵辛楣,刘国良,周作铭,赵毅   

  1. 中国石油新疆油田分公司勘探开发研究院,新疆 克拉玛依 834000
  • 收稿日期:2021-11-17 出版日期:2022-02-26 发布日期:2022-03-24
  • 作者简介:王然(1986—),女,硕士,工程师,主要从事地质勘探综合研究工作。地址:新疆维吾尔自治区克拉玛依市准噶尔路30号新疆油田分公司勘探开发研究院,邮政编码:834000。E-mail: nature6623@163.com

Geological section analysis of shale oil in Lucaogou Formation of Well-Ji-174, Junggar Basin

WANG Ran(),HE Wenjun,ZHAO Xinmei,LIU Guoliang,ZHOU Zuoming,ZHAO Yi   

  1. Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China
  • Received:2021-11-17 Online:2022-02-26 Published:2022-03-24

摘要:

吉174井是准噶尔盆地吉木萨尔凹陷芦草沟组页岩油储层取心最长、资料最多的探井,其“铁柱子”的建立对于页岩油纵向特征的研究具有重要意义。研究发现:储层岩性以碎屑岩和碳酸岩混杂的过渡岩性为主,纵向变化快;岩相反映向上水体逐渐增深的半深—深湖相沉积环境;储层平均孔隙度为11.1 %,平均渗透率为0.056 ×10-3μm2,属于中—低孔、低渗—特低渗储层;储层白云石和砂质含量与物性、含油性呈正相关;发育上、下2套甜点体,上“甜点”储集层岩性主要为砂屑云岩,发育溶蚀孔发育型储集空间,厚度为24 m;下“甜点”储集层岩性主要为粉细砂岩、云屑砂岩和云质粉砂岩,储集空间主要为裂缝—孔隙型,厚度35 m;2套甜点体有利区面积为1 299 km2,展现芦草沟组页岩油具备规模勘探潜力。

关键词: 页岩油, 甜点体, 地质特征, 芦草沟组, 准噶尔盆地

Abstract:

Well-Ji-174 is an exploration well with the longest core extraction and the most data in the shale oil reservoir of Lucaogou Formation in Jimusar sag, Junggar Basin. The establishment of the “iron pillar” is of great significance to the studies of the shale oil longitudinal characteristics. It is found that the lithology of reservoir is mainly transitional lithology mixed with clastic rock and carbonate rock, and changes quickly in the longitudinal direction. The lithofacies reflects the semi-deep to deep lacustrine sedimentary environment with gradually deepening upward water body. The average porosity and permeability of the reservoir are 11.1 % and 0.056×10-3 μm2, respectively, which make the reservoir presents the characteristics of medium-low porosity, low-permeability and ultra-low permeability. The dolomite and sand content of the reservoir are positively correlated with the physical property and oil content. The upper and lower sweet spots are developed. The main lithology of the upper sweet spot is clastic dolomite, allowing the formation of the reservoir space with developed dissolution pores and a thickness of 24 m. The main lithology of the lower one is fine siltstone, dolomite sandstone and dolomite siltstone, whose reservoir space with thickness of 35 m is mostly fissures and pores. The favorable area of these two sweet spots covers an area of 1 299 km2, indicating that the shale oil in Lucaogou Formation has large-scale exploration potential.

Key words: shale oil, sweet spot, geological characteristics, Lucaogou Formation, Junggar Basin

中图分类号: 

  • TE121