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《Chinese Journal of Geophysics》 2018-03
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P-wave velocity dispersion and attenuation in fluid-saturated tight sandstones:Characteristics analysis based on a double double-porosity structure model description

GUO MengQiu;BA Jing;MA RuPeng;CHEN TianSheng;ZHANG Lin;PANG MengQiang;XIE JianYong;Institute of Earth Probe,School of Earth Sciences and Engineering,Hohai University;Center of Oil/gas Geophysics,Petroleum Exploration and Production Research Institute,SINOPEC;  
Tight sandstones have general geological characteristics of low porosity,low permeability and development of micro-crack systems,which present strong heterogeneity.There are obviousdifferences of rock physical and percolation mechanical properties between the tight sandstone reservoirs and the conventional sandstone reservoirs.The heterogeneity inside tight sandstones,including fabric heterogeneity(the inhomogeneity of pore properties within rock matrix)and the heterogeneous distribution of immiscible fluid mixtures inside pores,has a significant effect on elastic wave velocity dispersion and attenuation.Furthermore,the scale of heterogeneity determines the characteristic frequency bands of wave dispersion and attenuation.In a comprehensive analysis of the heterogeneities of pore structure and fluid patchy-saturation in tight sandstones,this paper adopts a double double-porosity structure to model elastic wave response features,and investigates the wave propagation characteristics in the rocks simultaneously containing the two types of heterogeneities.We analyzed the two different sets of ultrasonic measurement data of tight sandstones,one from the Sulige gas field of Ordos Basin,Northwest China and the other from the Guang′an gas field of Sichuan Basin,Southwest China,and presented the elastic wave velocity dispersion and attenuation curves for the corresponding rock specimens.The theoretical prediction results are shown to be in well agreement with the rock experimental data at the full-saturation and partial-saturation states.Comparative analysis on the core data of tight sandstones from the two gas fields shows that the Sulige specimens generally have higher permeability than Guang′an specimens.In each different porosity range,characteristics analysis shows that the micro-crack sizes of Sulige specimens are larger than those of Guang′an specimens.More grain contacts/cracks with smaller sizes are found to be developed in Guang′an tight sandstones in the low-porosity range.The velocity dispersion and attenuation in tight sandstones are impacted by a combined effect of fluid viscosity,grain cracks and fluid patchy-saturation.It is also deduced in the partially-saturated rocks that the contribution of the mechanism of patchy-saturation to the total attenuation will decline as rock porosity increase,while on the other hand,the proportion of attenuation caused by the mechanism of fabric heterogeneity increases.
【Fund】: 国家自然科学基金项目(41704109);; 中央高校基本科研业务费项目(2016B13114);; “江苏特聘教授”计划 中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室开放基金(SKLGED2017-5-2-E)资助
【CateGory Index】: P618.13;P631.4
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