| 恒速与高压压汞实验表征致密砂岩储层孔喉结构差异性分析 |
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| 引用本文： | 肖 阳,' target='_blank'>,萧汉敏,姜振学,' target='_blank'>,唐相路,' target='_blank'>,张 帆,' target='_blank'>,朱 林,' target='_blank'>,李晓慧,' target='_blank'>.恒速与高压压汞实验表征致密砂岩储层孔喉结构差异性分析[J].中州煤炭,2021,0(3):59-63. |
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| 作者姓名： | 肖 阳 ' target='_blank'> 萧汉敏 姜振学 ' target='_blank'> 唐相路 ' target='_blank'> 张 帆 ' target='_blank'> 朱 林 ' target='_blank'> 李晓慧 ' target='_blank'> |
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| 作者单位： | （1.中国石油大学（北京） 油气资源与探测国家重点实验室，北京 102249；2.中国石油大学（北京） 非常规油气科学技术研究院，北京 102249； 3.中国石油勘探开发研究院，北京 100083） |
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| 摘 要： | 针对致密储层孔喉非均质性强的特点，选取延长组致密砂岩样品分别进行高压压汞和恒速压汞测试，探讨2种方法在研究致密砂岩储层孔喉结构的差异性。结果显示:高压压汞实验由于高的进汞压力和汞的流速，常会遗漏一些大孔的信息，所测的进汞曲线反映的是某一喉道控制的进汞体积，不能定性得到喉道和孔隙的信息；恒速压汞实验的优点是可以定性孔隙和喉道，更适用于孔、喉性质差别很大的低渗透、致密储层。恒速压汞实验计算孔隙半径应用等效球法，计算出的孔隙半径偏大，导致孔隙和喉道曲线呈明显双峰状，并且由于恒速压汞实验进汞压力小，对小于0.12 μm的孔喉不能识别。对致密储层孔喉的精确研究，需要结合2种实验的优点共同表征。
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| 关 键 词： | 致密储层 孔喉结构 高压压汞 恒速压汞 |
Analysis on difference of pore-throat structure of tight sandstone reservoirs characterized by constant-rate mercury intrusion and high-pressure mercury intrusion experiments |
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| Xiao Yang,' target='_blank'>,Xiao Hanmin,Jiang Zhenxue,' target='_blank'>,Tang Xianglu,' target='_blank'>,Zhang Fan,' target='_blank'>,Zhu Lin,' target='_blank'>,Li Xiaohui,' target='_blank'>. Analysis on difference of pore-throat structure of tight sandstone reservoirs characterized by constant-rate mercury intrusion and high-pressure mercury intrusion experiments[J].Zhongzhou Coal,2021,0(3):59-63. |
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| Authors: | Xiao Yang ' target='_blank'> Xiao Hanmin Jiang Zhenxue ' target='_blank'> Tang Xianglu ' target='_blank'> Zhang Fan ' target='_blank'> Zhu Lin ' target='_blank'> Li Xiaohui ' target='_blank'> |
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| Affiliation: | （1.China University of Petroleum（Beijing），State Key Laboratory of Petroleum Resources and Prospecting，Beijing 102249，China；2.China University of Petroleum（Beijing），Unconventional oil and Gas Science and Technology Institute，Beijing 102249，China；3.China Petroleum Exploration and Development Research Institute，Beijing 100083，China） |
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| Abstract: | In view of the strong heterogeneity of pore throats in tight reservoirs，this paper selected Yanchang Formation tight sandstone samples for high-pressure mercury intrusion and constant-rate mercury intrusion tests，and explored the difference between the two methods in studying the pore throat structure of tight sandstone reservoirs.The results showed that the high pressure mercury experiment often misses some large pore information due to the high mercury inlet pressure and mercury flow rate.The measured mercury inflow curve reflects the mercury inflow volume controlled by a certain throat，and the information of throat and pore can not be obtained qualitatively.The advantage of the constant-rate mercury intrusion test is that it can qualitatively identify pores and throats，and is more suitable for low-permeability and tight reservoirs with very different pore and throat properties.The constant velocity mercury injection experiment uses the equivalent sphere method to calculate the pore radius，so the calculated pore radius is often too large，causing the pore and throat curve to be obviously bimodal.And because of the low mercury inlet pressure in the constant velocity mercury intrusion experiment，the pore throats smaller than 0.12 μm cannot be identified.The precise study of pore throats in tight reservoirs needs to be characterized by combining the advantages of the two experiments. |
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| Keywords: | ,tight reservoir, pore throat structure, high-pressure mercury intrusion, constant-rate mercury intrusion |
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