异常压力与AVO异常正演模拟
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摘要
在建立正演压力模型的基础上,讨论了孔隙压力从异常低压递增到极限压力的过程中,在游离气饱和度为20%时,游离气在孔隙中分别以均匀分布和块状分布这二种情况存在,利用理论模型Biot-Geerstma-Smith方程分别算出纵波和转换横波的速度。然后分析异常压力的变化对P波、PS波反射系数的影响,以及由此产生的AVO异常,并且得出可以用AVO曲线来预测异常高压的结论。
Conceptual model of Biot-Geerstma-Smith equation,based on forward pressure model was adopted in the calculation of P-wave and converted shear wave under the two conditions of the free gas either evenly distributed or massively distributed in pores and of the free gas saturation being over 20% during the transforming process of pore pressure from subnormal value to threshold value. By analyzing the impact of abnormal pressure on P-wave and PS-wave reflection factors, and the consequently excited AVO anomaly, it can be concluded that AVO curve can be used to predict supper pressures.
Conceptual model of Biot-Geerstma-Smith equation,based on forward pressure model was adopted in the calculation of P-wave and converted shear wave under the two conditions of the free gas either evenly distributed or massively distributed in pores and of the free gas saturation being over 20% during the transforming process of pore pressure from subnormal value to threshold value. By analyzing the impact of abnormal pressure on P-wave and PS-wave reflection factors, and the consequently excited AVO anomaly, it can be concluded that AVO curve can be used to predict supper pressures.
引文
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[2]TINIVELLA U.The seismic response to overpressureversus gas hydrate and free gas concentration[J].Jour-nal of seismic Exploration,2002,11:283.
[3]SLOAN E D.Clathrate Hydrate of Natural Gases[M].New York:Marcell Deckker Inc,1990.
[4]SHIPLEY TH,HOUSTON MH,BULLER R T,et al;Seismic evidence for widespread possible gas hydrateshorizons on continental slopes and margins[M].Am.Assoc.Pet.Geol.Bull,1979.
[5]何樵登,熊维纲.应用地球物理教程-地震勘探[M].北京:地质出版社,1991.
[6]黄永玲,项希勇.用地震压力预测技术研究临清坳陷(东部)泥岩压实与油气运移[J].复式油气田,1999,(4):35.
[7]高建荣,胡宇芳,王延.基于AVO的属性分析[J].物探化探计算技术,2007,29(4):303.
[8]黄伟,徐红梅,卢学东.异常高压与油气成藏的关系[J].国外油田工程,2003,19(7):22.
[9]金业权,王越之,李自俊.地震资料预测地层孔隙压力应基于欠压实成因[J].石油钻探技术,2000,28(3):7.
[10]李邗,何诚.AVO处理解释和岩性识别[J].物探化探计算技术,2003,25(2):145.
[11]梁劲,梁金强,王宏斌,等.AVO属性分析在天然气水合物地震解释中的应用[J].物探化探计算技术,2008,30(1):22.
[12]周巍,郭全仕.岩石孔隙对AVO的影响研究[J].物探与化探,2008,32(1):53.
[13]付雷,王建民,孔祥波,等.多波AVO分析在兴城地区的应用研究[J].石油地球物理勘探,2008,43(1):88.
[14]杨申谷,胡治华,李景义.异常高压对库车拗陷中生界储层成岩作用及孔隙演化的影响[J].大庆石油学院学报,2008,32(1):26.
[15]尚新民,李红梅,韩文功,等.基于岩石物理与地震正演的AVO分析方法[J].天然气工业,2008,28(2):64.
[16]罗啸泉,宋进.川西地区须家河组异常高压分布与油气富集[J].中国西部油气地质,2007,3(1):35.
[17]邱艳.异常高压层的识别及解释方法研究[D].大庆:大庆石油学院,2007.
[18]张玉华.基于岩石物理的AVO正演模拟研究[D].北京:中国石油大学,2007.
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