基于双相介质的地震油气检测方法——以Y925地区为例
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摘要
依据Biot理论,地震波通过双相介质时,存在"高频共振、低频衰减"的现象。本文根据设计理论模型,应用地震波场正演模拟技术模拟认为,当储层含有水或油时,出现低频增加、高频衰减的趋势,并且含水低频增加的趋势更为明显;当储层含有气时,出现高频衰减,验证了地震波在双相介质中传播频率发生变化。分析了不同油气检测方法在时间域和频率域中的适用范围,其中,Y925地区沙三(Es3)中层第6砂组流体预测结果吻合较好,表明所用检测方法具有较强的适用性和可行性。
According to the Biot theory, the seismic wave has the phenomenon of"high frequency resonance and low frequency attenuation"when it travels through two phase medium. Based on the theoretical model, the results derived by the seismic wave field forward modeling show that the low frequency component increase and the high frequency component attenuate when the reservoir contain water or oil, it is more obvious in water- bearing reservoir. The high frequency component attenuate when the reservoir contains gas, it verified that the frequency of the seismic wave change in two phase medium. The ranges of application of different hydrocarbon detection method are analyzed in the time and frequency domain, the results show that the sand group 6 of the middle of Es3 in Y925 area has a better prediction coincidence, which show the detection method used has a better applicability and feasibility.
According to the Biot theory, the seismic wave has the phenomenon of"high frequency resonance and low frequency attenuation"when it travels through two phase medium. Based on the theoretical model, the results derived by the seismic wave field forward modeling show that the low frequency component increase and the high frequency component attenuate when the reservoir contain water or oil, it is more obvious in water- bearing reservoir. The high frequency component attenuate when the reservoir contains gas, it verified that the frequency of the seismic wave change in two phase medium. The ranges of application of different hydrocarbon detection method are analyzed in the time and frequency domain, the results show that the sand group 6 of the middle of Es3 in Y925 area has a better prediction coincidence, which show the detection method used has a better applicability and feasibility.
引文
[1]Mu Yongguang.Reservoir Geophysics[M].Beijing:Petroleum Industry Press,1996:1-98.
[2]Biot M A.Theory of propagation of elastic waves in a fluid saturated porous solid(Ⅰ):Low-frequency range[J].The Journal of the Acoustical Society of America,1956,28(2):168-179.
[3]Biot M A.Theory of propagation of elastic waves in a fluid saturated porous solid(Ⅱ):Higher frequency range[J].The Journal of the Acoustical Society of America,1956,28(2):179-191.
[4]Biot M A.Generalized theory of acoustic propagation in porous dissipative media[J].The Journal of the Acoustical Society of America,1962,34(9A):1254-1264.
[5]张艳芳,王权锋.基于双相介质的地震油气检测技术[J].天然气地球科学,2013,24(4):803-805.
[6]软件操作手册.
[2]Biot M A.Theory of propagation of elastic waves in a fluid saturated porous solid(Ⅰ):Low-frequency range[J].The Journal of the Acoustical Society of America,1956,28(2):168-179.
[3]Biot M A.Theory of propagation of elastic waves in a fluid saturated porous solid(Ⅱ):Higher frequency range[J].The Journal of the Acoustical Society of America,1956,28(2):179-191.
[4]Biot M A.Generalized theory of acoustic propagation in porous dissipative media[J].The Journal of the Acoustical Society of America,1962,34(9A):1254-1264.
[5]张艳芳,王权锋.基于双相介质的地震油气检测技术[J].天然气地球科学,2013,24(4):803-805.
[6]软件操作手册.
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