新疆石油地质

新疆石油地质 ›› 2025, Vol. 46 ›› Issue (3): 288-295.doi: 10.7657/XJPG20250305

• 油气勘探 • 上一篇    下一篇

演武油田延安组储集层特征及敏感性主控因素

杨龙1(), 朱玉双1(), 康永梅2, 刘一婷2, 包琛龙3, 何辉4   

  1. 1.西北大学 地质学系，西安 710069
    2.中国石油 长庆油田分公司 第十一采油厂，甘肃 庆阳 745000
    3.中国石油 玉门油田分公司 勘探开发研究院，甘肃 酒泉 735019
    4.河北省煤田地质局 环境地质调查院，石家庄 050085
  • 收稿日期:2025-01-26 修回日期:2025-05-03 出版日期:2025-06-01 发布日期:2025-06-13
  • 通讯作者: 朱玉双（1968-），女，黑龙江大庆人，教授，博士，油气田开发，（Tel）13571916162（Email）yshzhu@nwu.edu.cn
  • 作者简介:杨龙（1995-），男，河南商丘人，硕士研究生，油气田开发，（Tel）18409440922（Email）289242765@qq.com
  • 基金资助:
    国家科技重大专项(2017ZX05008-004-004-001)

Reservoir Characteristics and Sensitivity Controlling Factors of Yan’an Formation in Yanwu Oilfield, Ordos Basin

YANG Long1(), ZHU Yushuang1(), KANG Yongmei2, LIU Yiting2, BAO Chenlong3, HE Hui4   

  1. 1. Department of Geology, Northwest University, Xi’an, Shaanxi 710069, China
    2. No.11 Oil Production Plant, Changqing Oilfield Company, PetroChina, Qingyang, Gansu 745000, China
    3. Research Institute of Exploration and Development, Yumen Oilfield Company, PetroChina, Jiuquan, Gansu 735019, China
    4. Institute of Environmental Geological Survey, Hebei Coalfield Geological Bureau, Shijiazhuang, Hebei 050085, China
  • Received:2025-01-26 Revised:2025-05-03 Online:2025-06-01 Published:2025-06-13

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摘要：

为了减小储集层敏感性伤害，提高油田采收率，对演武油田下侏罗统延7和延8储集层特征及敏感性主控因素进行研究。利用物性、铸体薄片、扫描电镜、压汞资料及各类敏感性实验，明确储集层特征，评价储集层敏感性，并对敏感性主控因素进行分析。结果表明：演武油田延7和延8储集层分别发育中粒长石岩屑质石英砂岩和中—细粒岩屑石英砂岩；延7和延8储集层的平均孔隙度分别为15.3%和13.7%，平均渗透率分别为498.9 mD和343.0 mD，平均面孔率分别为9.5%和8.7%，平均孔隙直径为别为83.1 μm和51.8 μm；延7和延8储集层均具有弱—中等偏弱速敏、弱盐敏、弱—中等酸敏、强碱敏和无—弱压敏，水敏差异较大，延7储集层具有弱—中等水敏，延8储集层以中等—强水敏为主；延7和延8储集层敏感性受岩石矿物组成、物性及孔喉结构影响，其中，岩石矿物组成是储集层敏感性主控因素；储集层水敏性与伊利石含量及产状密切相关，酸敏性受绿泥石和铁白云石共同影响，强碱敏是由于长石和石英含量较高。储集层改造中，应严格控制注入地层流体的pH值，减小敏感性对储集层的伤害。

关键词: 鄂尔多斯盆地, 演武油田, 延安组, 储集层特征, 敏感性评价, 主控因素

Abstract:

To mitigate reservoir sensitivity damage and enhance oil recovery, the reservoir characteristics and sensitivity controlling factors of the 7th and 8th members of the Lower Jurassic Yan’an formation (Yan 7 and Yan 8 members) in the Yanwu oilfield, Ordos Basin were investigated. Using the data of petrophysical properties, cast thin sections, scanning electron microscopy (SEM), and mercury intrusion, and through various reservoir sensitivity experiments, the reservoir characteristics were identified, the reservoir sensitivities were evaluated, and the factors controlling reservoir sensitivities were analyzed. The results show that the Yan 7 and Yan 8 reservoirs are primarily composed of medium-grained feldspathic lithic quartz sandstones and medium- to fine-grained lithic quartz sandstones, respectively. The Yan 7 and Yan 8 reservoirs exhibit average porosities of 15.3% and 13.7%, average permeabilities of 498.9 mD and 343.0 mD, average plane porosities of 9.5% and 8.7%, and average pore diameters of 83.1 μm and 51.8 μm, respectively. The two reservoirs show weak-moderate velocity sensitivity, weak salinity sensitivity, weak-moderate acid sensitivity, strong alkali sensitivity, and negligible-to-weak stress sensitivity. The water sensitivities of the two reservoirs differs significantly: the Yan 7 reservoir shows a weak-moderate water sensitivity, while the Yan 8 reservoir has a moderate-strong water sensitivity. The sensitivities of the two reservoirs are primarily influenced by mineral composition, physical properties, and pore-throat structure, among which mineral composition plays a dominant role. The water sensitivity is closely related to the content and occurrence of illite; the acid sensitivity is influenced by the presence of chlorite and ferroan dolomite; and the strong alkali sensitivity results from high feldspar and quartz content. During reservoir stimulation, the pH values of injected fluids should be strictly controlled to minimize the reservoir damage induced by sensitivity.

Key words: Ordos Basin, Yanwu oilfield, Yan’an formation, reservoir characteristic, sensitivity evaluation, controlling factor

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