中国石油勘探 ›› 2019, Vol. 24 ›› Issue (3): 323-330.DOI: 10.3969/j.issn.1672-7703.2019.03.005

• 石油地质 • 上一篇    下一篇

河套盆地临河坳陷新生界油源对比及其勘探意义

罗丽荣1,2, 李剑锋1,2, 赵占良1,2, 柳娜1,2, 马军1,2, 杨伟伟1,2   

  1. 1 中国石油长庆油田公司勘探开发研究院;
    2 低渗透油气田勘探开发国家工程实验室
  • 收稿日期:2018-11-12 修回日期:2018-12-26 出版日期:2019-05-15 发布日期:2019-05-14
  • 基金资助:
    国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程(二期)”(2016ZX05050)。

Cenozoic oil-source correlation and exploration significance in Linhe depression, the Hetao Basin

Luo Lirong1,2, Li Jianfeng1,2, Zhao Zhanliang1,2, Liu Na1,2, Ma Jun1,2, Yang Weiwei1,2   

  1. 1 Research Institute of Exploration & Development, PetroChina Changqing Oilfield Company;
    2 National Engineering Laboratory for Exploration & Development of Low-Permeability Oil & Gas Fields
  • Received:2018-11-12 Revised:2018-12-26 Online:2019-05-15 Published:2019-05-14
  • Supported by:
     

摘要: 河套盆地临河坳陷勘探程度低,早期未取得油气实质性发现,近期石油勘探取得重大突破,S5井、Jh2X井在古近系渐新统临河组试油分别获得62.6m3/d和10.26m3/d的高产工业油流。为了剖析S5井、Jh2X井原油的油源关系,确定今后的勘探目标,对原油与烃源岩开展系统的有机地球化学分析。S5井、Jh2X井原油为低成熟—成熟原油,总体反映出高盐、厌氧的咸水湖泊沉积环境。下白垩统固阳组与渐新统临河组烃源岩为咸水湖相烃源岩,部分烃源岩处于低成熟—成熟阶段,有机质丰度高、母质类型好、生烃潜力大。油源对比结果显示S5井原油来自临河组烃源岩,Jh2X井原油可能来自于固阳组成熟烃源岩。临河坳陷油气资源丰富,具备良好的勘探潜力,固阳组与临河组是主要勘探目的层。

 

关键词: 河套盆地, 临河坳陷, 新生界, 油源对比, 勘探意义

Abstract: Linhe depression in the Hetao Basin has been less explored. No significant oil and gas discoveries were made until some breakthroughs recently. Wells S5 and Jh2X delivered commercial oil flows of 62.6 m3/d and 10.26 m3/d, respectively, from Oligocene Linhe Formation during the production tests. In this study, the correlation between oil and source rock of Wells S5 and Jh2X was systematically analyzed from prospective of organic geochemistry, in order to determine the oil-source correlation and thereby facilitate the selection of exploration targets. Crude oil in Wells S5 and Jh2X is less mature to mature, generally reflecting the characteristics of a high-salinity and anoxic lacustrine environment. The source rocks in Lower Cretaceous Guyang Formation and Oligocene Linhe Formation are saline lacustrine facies, and less mature to mature locally with abundant organic matters, good kerogen types and high hydrocarbon-generating potential. The oil-source correlation reveals that the oil in Well S5 was originated from the source rock in Linhe Formation, and the oil in Well Jh2X might derive from the mature source rock in Guyang Formation. In conclusion, Linhe depression has a good exploration potential for its rich oil and gas resources, with Guyang and Linhe Formations as the key exploration targets.

Key words: Hetao Basin, Linhe depression, Cenozoic, oil-source correlation, exploration significance

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