基于离散裂缝网络模型的深部花岗岩热储地热资源产能评估
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1.山东省第一地质矿产勘查院;2.山东省地质矿产勘查开发局;3.太原理工大学水利科学与工程学院;4.中海石油中国有限公司天津分公司渤海石油研究院

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P314

基金项目:

山东省自然科学(ZR2020QD122);山东省第一地质矿产院(QN202007,2022DY09);山西省基础研究计划(202203021211127)


Evaluation of deep granitic geothermal resource potential based on discrete fracture network model
Author:
Affiliation:

1.No Institute of Geology and Mineral Resource Exploration of Shandong Province,Jinan;2.Shandong Provincial Bureau of Geology Mineral Resources,Jinan;3.College of Water Resources Science and Engineering,Taiyuan University of Technology;4.Bohai Petroleum Research Institute,Tianjin Branch,CNOOC China Ltd

Fund Project:

Shandong Provincial Natural Science Foundation (ZR2020QD122),No.1 Institute of Geology and Mineral resources of Shandong Province (QN202007, 2022DY09) and Shanxi Basic Research Program Project (202203021211127)

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    摘要:

    提要:【研究目的】为评估深部花岗岩热储地热资源开采潜力,【研究方法】基于山东半岛文登岩体地质勘查、深井测温序列及岩石力学、热物性测试等成果,建立了深部花岗岩热储地热资源离散裂缝网络水力压裂模型,模拟了目标储层改造后形成的多种热储规模。基于压裂结果,利用TOUGH2-EOS1-MINC建立了缝网热储渗流-传热耦合数值模型。研究了裂缝间距、布井模式和注水速率等参数对产能动态的影响。【研究结果】结果表明:深部地热开采中,选择具有应力遮挡的天然裂缝储层作为目标储层时,应保持较大井间距,且不宜选择天然裂缝过度发育的储层。对于同一热储,五井开采模式和三井开采模式的各性能指标变化规律相似,但产能动态变化幅度不同;压力指标比温度指标对布井模式更为敏感。同一储层采用五井模式的发电量比三井模式略有提高。【结论】在选择目标储层时,应优选天然裂缝适中、地应力遮挡高的高温储层。然后注入大量压裂液进行压裂改造,使热储尽可能沿水平方向延伸。对于理想的大型热储,应优先采用五井开采模式,但要考虑工程整体的经济效益。

    Abstract:

    [Objective] To assess deep granite type geothermal resource potential of Wendeng area in Shandong peninsula, [Methods] we established discrete fracture network model of hydraulic fracturing based on the geological data, the deep well temperature data, core physical and mechanical test results. The potential created heat reservoirs were simulated for target reservoir. According to the fracturing results, a coupled numerical model of seepage and heat transfer in fractured heat reservoir is established using TOUGH2-EOS1-MINC code. The influence of fracture spacing, well pattern and injection rate on productivity is studied. [Results] The results show that natural fractured reservoirs with stress shielding should be selected as the target reservoirs in deep geothermal exploitation. Large well spacing should be maintained, and reservoirs with overdeveloped natural fractures should not be selected. For the same heat reservoir, the variation of each performance index of five-well mode and three-well mode is similar, but their dynamic variation of productivity is different. The pressure index is more sensitive to the well pattern than the temperature index. The power generation of five-well mode is slightly higher than that of three-well mode for the same reservoir. [Conclusions] When selecting the target reservoir, the high temperature reservoir with moderate natural fractures and high stress shielding should be preferred. Meanwhile, a large amount of fracturing fluid should be injected to drive the reservoir to extend as far horizontally as possible. For the ideal large-scale heat reservoir, the five-well mode should be preferred, but its overall economic benefits should be considered.

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  • 收稿日期:2022-11-04
  • 最后修改日期:2022-12-17
  • 录用日期:2023-05-02
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