新疆石油地质 ›› 2026, Vol. 47 ›› Issue (4): 451-458.doi: 10.7657/XJPG20260408

• 油藏工程 • 上一篇    下一篇

鄂尔多斯盆地古生界气藏含气饱和度定量解释——以伊陕斜坡东南部A井区为例

陈占军1(), 任战利2, 高小平3, 刘宝平3, 于春勇4, 郝倩倩1, 王富院1   

  1. 1 陇东学院 石油化工学院甘肃 庆阳 745000
    2 西北大学 地质学系西安 710069
    3 延长石油集团 天然气公司陕西 延安 716099
    4 中国石油集团 渤海钻探工程有限公司 第一录井公司天津 300280
  • 收稿日期:2025-02-19 修回日期:2025-06-08 接受日期:2025-07-28 出版日期:2026-08-01 发布日期:2026-07-30
  • 作者简介:陈占军(1982-),男,陕西鄠邑人,副教授,博士,致密油气藏勘探,(Tel)0934-8658670(Email)john_wudy@163.com
  • 基金资助:
    国家自然科学基金(421602015);甘肃省自然科学基金(23JRRM733);庆阳市自然科学基金(QY-STK-2022A-010)

Quantitative Interpretation of Gas Saturation in Paleozoic Gas Reservoirs in the Ordos Basin: Taking Well A Area in the Southeastern Yishaan Slope as an Example

CHEN Zhanjun1(), REN Zhanli2, GAO Xiaoping3, LIU Baoping3, YU Chunyong4, HAO Qianqian1, WANG Fuyuan1   

  1. 1 College of Petroleum and Chemical Engineering, Longdong University, Qingyang, Gansu 745000, China
    2 Department of Geology, Northwest University, Xi’an, Shaanxi 710069, China
    3 Natural Gas Company, Shaanxi Yanchang Petroleum (Group) Co., Ltd., Yan’an, Shaanxi 716099, China
    4 No.1 Mud Logging Company, Bohai Drilling Engineering Company Limited, CNPC, Tianjin 300280, China
  • Received:2025-02-19 Revised:2025-06-08 Accepted:2025-07-28 Published:2026-08-01 Online:2026-07-30

摘要:

为了提高鄂尔多斯盆地古生界致密砂岩气藏储层流体饱和度定量解释精度,对储层物理性质及电性特征进行分析,发现先解释孔隙度与含水孔隙度,再解释含气饱和度具有可行性。重新推导阿尔奇公式,获得含水孔隙度与电阻率的解释方程,并得到地层条件下的地层水电阻率,不需要进行岩电实验和地层水电阻率测试。在此理论基础上,以伊陕斜坡东南部A井区为例,建立储层流体定量解释方法:首先,分析现有基础数据获取过程及主要误差原因,筛选流体散失最小的数据作为含水孔隙度的基础数据;其次,建立含水孔隙度与电阻率的交会图版,获取含水孔隙度解释方程;最后,根据孔隙度解释方程和含水孔隙度解释方程定量解释A井区储层的含气饱和度。新解释的含气饱和度与生产结果高度吻合,与单层试气结果符合率为95.14%。与阿尔奇公式解释结果相比,该解释方法降低了实验技术要求,且解释精度与分辨率均提高。该研究丰富了鄂尔多斯盆地致密砂岩气藏定量解释的理论,也可为其他区块致密砂岩气藏含气饱和度定量解释提供参考。

关键词: 鄂尔多斯盆地, 伊陕斜坡, 古生界, 致密砂岩气藏, 致密储层, 含水孔隙度, 含气饱和度

Abstract:

To enhance the quantitative interpretation accuracy of fluid saturation in the Paleozoic tight sandstone gas reservoirs in the Ordos Basin, the physical and electric properties of the reservoir were analyzed, indicating a feasibility to interpret porosity, water saturation and gas saturation in sequence. The Archie formula was re-derived to obtain an equation to represent water-bearing porosity and resistivity, and the in-situ resistivity of formation water was defined, without the necessity to perform litho-electric experiments and formation water resistivity tests. On the basis of the above theory, taking the Well A area in the southeastern Yishaan slope as an example, a quantitative interpretation approach of reservoir fluid was established. Firstly, the existing basic data acquisition process and the main error causes were analyzed, and the data with the minimum fluid loss were selected as the basic data for interpreting water-bearing porosity. Then, the crossplot of water-bearing porosity and resistivity was established, and the water-bearing porosity interpretation equation was formed. Finally, according to the porosity interpretation equation and the water-bearing porosity interpretation equation, the gas saturation of reservoirs in the Well A area was quantitatively interpreted. It is found that the obtained gas saturation is highly consistent with the production results, and is 95.14% coincident with the single-layer gas test results. Compared with the results from Archie formula, the proposed interpretation approach exhibits lower technical requirements for experiments, and achieves improvements in both accuracy and resolution. This research enriches the theory for quantitative interpretation of tight sandstone gas reservoirs in the Ordos Basin, and provides reference for quantitative interpretation of tight sandstone gas reservoirs in other areas.

Key words: Ordos Basin, Yishaan slope, Paleozoic, tight sandstone gas reservoir, tight reservoir, water-bearing porosity, gas saturation

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