热储温度评价是地热系统研究的关键内容。文章选取建设比较成熟的美国国家地热数据系统(National Geothermal Data System,NGDS),分别利用地球化学地热温度计、多矿物平衡法、冷热水混合模型及气体地热温度计对不同地热田的热储温度进...热储温度评价是地热系统研究的关键内容。文章选取建设比较成熟的美国国家地热数据系统(National Geothermal Data System,NGDS),分别利用地球化学地热温度计、多矿物平衡法、冷热水混合模型及气体地热温度计对不同地热田的热储温度进行评价,确定不同热储温度评价方法的适用性和局限性,以期为热储温度评价方法的选取提供参考。研究结果表明,当地热水体达到离子和矿物的平衡状态时,地球化学地热温度计可得到相对合理的热储温度;当地热水体未达到离子和矿物的平衡状态时,SiO2地热温度计较阳离子温度对热储温度的评价效果更准确。尽管基于饱和指数的多矿物平衡法由于有限饱和平衡矿物选择导致不一定得到精确的热储温度,但可为地球化学地热温度计的选取提供依据,比如当石英过饱和时,用玉髓地热温度计计算的温度比石英更能反映地下的热储温度。对于蒸汽为主的高温地热储层,由于蒸汽和地表岩石反应导致矿物和离子无法反映热储信息,气体地热温度计对该类型热储温度的评价更加合理。由于混合模型得到的是冷、热水混合之前的热水端温度,因此,混合模型计算的热储温度通常高于地球化学地热温度计。总之,没有一种温度计是万能的,不同地热温度计适用条件不同,综合不同合理的方法以及互相校正是最好的方法。展开更多
Quantificational characterization of the microscopic pore structure is the key to evaluating tight reservoirs. Since tight reservoirs mainly develop nano-pores which are difficult to fully characterize pore throats＇ ...Quantificational characterization of the microscopic pore structure is the key to evaluating tight reservoirs. Since tight reservoirs mainly develop nano-pores which are difficult to fully characterize pore throats＇ distribution by single conventional experimental method, there＇s an urgent need to establish a characterization method by jointing several conventional experimental methods.展开更多
Currently, there are two main methods to obtain total organic carbon （TOC） content in mud shale geochemical analysis and AlgR model. Geochemical analysis can obtain accurate TOC content, but it has the problem of hi...Currently, there are two main methods to obtain total organic carbon （TOC） content in mud shale geochemical analysis and AlgR model. Geochemical analysis can obtain accurate TOC content, but it has the problem of higher cost and less samples. The AlgR model can obtain TOC content variable values in well profile conveniently and quickly, but it can＇t predict TOC content in mud shale in cross-hole area. Both the methods can＇t meet the needs of resources evaluation of shale oil in the back ground of strong organic heterogeneous in mud shale.展开更多
文摘热储温度评价是地热系统研究的关键内容。文章选取建设比较成熟的美国国家地热数据系统(National Geothermal Data System,NGDS),分别利用地球化学地热温度计、多矿物平衡法、冷热水混合模型及气体地热温度计对不同地热田的热储温度进行评价,确定不同热储温度评价方法的适用性和局限性,以期为热储温度评价方法的选取提供参考。研究结果表明,当地热水体达到离子和矿物的平衡状态时,地球化学地热温度计可得到相对合理的热储温度;当地热水体未达到离子和矿物的平衡状态时,SiO2地热温度计较阳离子温度对热储温度的评价效果更准确。尽管基于饱和指数的多矿物平衡法由于有限饱和平衡矿物选择导致不一定得到精确的热储温度,但可为地球化学地热温度计的选取提供依据,比如当石英过饱和时,用玉髓地热温度计计算的温度比石英更能反映地下的热储温度。对于蒸汽为主的高温地热储层,由于蒸汽和地表岩石反应导致矿物和离子无法反映热储信息,气体地热温度计对该类型热储温度的评价更加合理。由于混合模型得到的是冷、热水混合之前的热水端温度,因此,混合模型计算的热储温度通常高于地球化学地热温度计。总之,没有一种温度计是万能的,不同地热温度计适用条件不同,综合不同合理的方法以及互相校正是最好的方法。
基金supported by the National Basic Research Program of China(Grant No.2014CB239005-001)the National Natural Science Foundation of China(Grant No.41402109)
文摘Quantificational characterization of the microscopic pore structure is the key to evaluating tight reservoirs. Since tight reservoirs mainly develop nano-pores which are difficult to fully characterize pore throats＇ distribution by single conventional experimental method, there＇s an urgent need to establish a characterization method by jointing several conventional experimental methods.
文摘Currently, there are two main methods to obtain total organic carbon （TOC） content in mud shale geochemical analysis and AlgR model. Geochemical analysis can obtain accurate TOC content, but it has the problem of higher cost and less samples. The AlgR model can obtain TOC content variable values in well profile conveniently and quickly, but it can＇t predict TOC content in mud shale in cross-hole area. Both the methods can＇t meet the needs of resources evaluation of shale oil in the back ground of strong organic heterogeneous in mud shale.
