松辽盆地北部古中央隆起带变速成图方法
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摘要
地震资料解释中时深转换是非常重要的环节,在古中央隆起带地区利用常规方法绘制的构造图误差比较大,为此提出了一种新的方法:因为钻至T_2反射层的井比较多,相对来说时深转换的速度比较准确,再把T_2至目的层的速度计算出来,就可以得到目的层以上的平均速度,这样就可以比较准确地完成时深转换,编制出更符合实际地质情况的构造图。依据以上方法,对古中央隆起带地区的T_5、T_(4-1)T_4、T_(3-2)、T(3-1a)、T_(3-1)、T_3反射层分别求取了至T_2反射层的层速度,再利用T_2反射层以上平均速度,从而得到了各目的反射层以上的平均速度,进行时深转换,编制出7个目的反射层的构造图。经过误差分析表明,利用这种方法编制的构造图的精度有了很大地提高。
Time-depth conversion is very important link of seismic data interpretation.The error of drawn structural map by conventional method in palaeocentral uplift belt is rather serious,so the paper presents a new approach:for so many wells drilled through T_2 reflection formation and the velocity of time-depth conversion is pretty accurate to a certain degree, if the velocity from T_2 to target formation calculates,the average velocity above the target layer can be obtained and then much accurate time-depth conversion can be performed and furthermore the drawn structural map can well accord with actual geological conditions.According to the above means,the layer velocities from reflection interfaces T_5, T_(4-1),T_4,T_(3-2),T_(3-1a),T_(3-1),T_3 to T_2 are seperatively got in palaeo-central uplift belt and then with the help of the average velocity above reflection interface T2,the average velocities above each reflection interface can be gain and then time-depth conversion can be conduct easily and finally the structural maps of total 7 reflection interfaces can be compiled. Through error analysis,the accuracy of compiling structural map by this method is proven accurate to a great deal.
Time-depth conversion is very important link of seismic data interpretation.The error of drawn structural map by conventional method in palaeocentral uplift belt is rather serious,so the paper presents a new approach:for so many wells drilled through T_2 reflection formation and the velocity of time-depth conversion is pretty accurate to a certain degree, if the velocity from T_2 to target formation calculates,the average velocity above the target layer can be obtained and then much accurate time-depth conversion can be performed and furthermore the drawn structural map can well accord with actual geological conditions.According to the above means,the layer velocities from reflection interfaces T_5, T_(4-1),T_4,T_(3-2),T_(3-1a),T_(3-1),T_3 to T_2 are seperatively got in palaeo-central uplift belt and then with the help of the average velocity above reflection interface T2,the average velocities above each reflection interface can be gain and then time-depth conversion can be conduct easily and finally the structural maps of total 7 reflection interfaces can be compiled. Through error analysis,the accuracy of compiling structural map by this method is proven accurate to a great deal.
引文
[1]王树华,刘怀山,张云银,等.变速成图方法及应用研究[J].中国海洋大学学报,2004,34(1):139-146.
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[4]袁井菊.层叠法变速构造成图的地质基础及其应用[J].石油物探,2006,45(3):285-289.
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[2]雷卫兵,曹坚明,查树贵.变速成图技术在二连盆地赛汉塔拉凹陷低幅度构造解释中应用[J].内蒙古石油化工,2005,10 (10):91-94.
[3]郭广成,雷卫兵.变速成图方法在江陵凹陷构造解释中的应用[J].江汉石油职工大学学报,2007,20(6):3-6.
[4]袁井菊.层叠法变速构造成图的地质基础及其应用[J].石油物探,2006,45(3):285-289.
[5]孙开峰,叶勇.泛克里格法在三维地震资料变速成图中的应用[J].石油物探,1998,37(2):112-117.
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