| 孔隙压力对碳酸盐岩储层声学特性的影响研究 |
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| 引用本文： | 高可攀,刘向君,梁利喜.孔隙压力对碳酸盐岩储层声学特性的影响研究[J].物探化探计算技术,2019(2):141-147. |
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| 作者姓名： | 高可攀 刘向君 梁利喜 |
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| 作者单位： | 西南石油大学油气藏地质及开发工程国家重点实验室 |
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| 摘 要： | 与传统的砂岩、泥岩不同,缝洞型碳酸盐岩具有较强的非均质性及各向异性,因此利用传统的方法对其进行孔隙压力预测尤为困难。利用声学信息进行孔隙压力预测是一种有效的预测方法,研究孔隙压力对碳酸盐岩储层声学特性的影响,具有重要的理论意义和应用价值。通过对孔洞发育程度不同的缝洞型碳酸盐岩进行不同孔隙压力下的声学实验测试,在实验的基础上,分析了不同孔隙流体压力条件下岩心的声波时差、衰减系数、时频特性,得到了孔隙压力与不同类型碳酸盐岩纵横波时差及衰减系数之间的关系;探讨了孔隙压力对不同类型碳酸盐岩纵横波在时域及频域上的影响。此研究为利用声学特性对碳酸盐岩储层孔隙压力预测提供了借鉴。
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| 关 键 词： | 孔隙压力 碳酸盐岩 声学特性 衰减系数 时频分析 |
Investigation on the influence of the pore pressure on the acoustic properties of carbonate reservoir |
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| GAO Kepan,LIU Xiangjun,LIANG Lixi.Investigation on the influence of the pore pressure on the acoustic properties of carbonate reservoir[J].Computing Techniques For Geophysical and Geochemical Exploration,2019(2):141-147. |
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| Authors: | GAO Kepan LIU Xiangjun LIANG Lixi |
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| Institution: | (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China) |
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| Abstract: | Different from traditional sandstone and mudstone,there are strong heterogeneity and anisotropy of the fracture-cave carbonate.Therefore,it is especially difficult to predict the pore pressure with traditional methods.The prediction of pore pressure using acoustic information is an effective prediction method.The changes of pore fluid pressure will inevitably lead to changes in pore structure and pore space of carbonate reservoirs,which will affect the acoustic characteristics of carbonate reservoirs.It is of great theoretical significance and application value to study the effect of pore pressure on the acoustic characteristics of carbonate reservoirs.In this paper,the acoustic experiments under different pore pressure were carried out on the fracture-cave carbonate rocks with different development degrees.On the basis of the experiment,the acoustic time difference,attenuation coefficient and time-frequency characteristics of the core under different pore fluid pressure conditions are analyzed.The relationship between the pore pressure and the different types of carbonates is obtained and the influence of pore pressure on the time domain and frequency domain of different types of carbonate rocks is discussed.With the increase of pore pressure,there is an obvious increase of acoustic time.In different directions,the acoustic time increases with the increase of pore pressure,but the degree of increase is not the same.In the time domain,with the increase of the pore pressure,the first wave start time delay,the acoustic energy propagated in the core is rapidly attenuated;In frequency domain,for example,in the case of longitudinal wave,with the increase of pore pressure,the main frequency of the longitudinal wave is obviously offset.This study provides a basis for the prediction of pore pressure of carbonate reservoirs using acoustic characteristics. |
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| Keywords: | pore pressure carbonate acoustic properties attenuation coefficient time-frequency analysis |
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