直径40m溶洞距灰岩顶界面不同距离时的地震响应
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摘要
塔中地区上奥陶统缝洞体储层大多距灰岩顶界较近,灰岩顶界表现为强地震反射,对储层的地震响应会造成影响。正演模拟表明:缝洞体距灰岩顶界0～30m时,灰岩顶界呈现地震反射缺失或明显减弱,内幕为杂乱反射;缝洞体距灰岩顶界60m时,灰岩顶界反射振幅变弱,内幕为强反射;缝洞体距灰岩顶界超过150m时,对灰岩顶界反射基本没有影响,缝洞体本身以"串珠状"反射形态出现。同时,通过实钻结果的精细标定对正演结论进行了验证。
The Upper Ordovician reservoirs mostly are close to the limestone top boundary where seismic reflection is strong,which causes influence on the seismic response of the reservoir.Forward modeling result shows that: the seismic reflection at the limestone top boundary is absent or decreased obviously with disorder inside reflection when the distance from fracture-cavity to the limestone top boundary ranges from 0 to 30 m;the seismic reflection at the limestone top boundary softens with strong inside reflection when the distance from fracture-cavity to the limestone top boundary is 60 m;the seismic reflection at the limestone top boundary has no change when the distance from fracture-cavity to the limestone top boundary is over 150 m,and the inside reflection presents moniliform.Based on the fine calibration of the actual drilling,the forward modeling result is verified.
The Upper Ordovician reservoirs mostly are close to the limestone top boundary where seismic reflection is strong,which causes influence on the seismic response of the reservoir.Forward modeling result shows that: the seismic reflection at the limestone top boundary is absent or decreased obviously with disorder inside reflection when the distance from fracture-cavity to the limestone top boundary ranges from 0 to 30 m;the seismic reflection at the limestone top boundary softens with strong inside reflection when the distance from fracture-cavity to the limestone top boundary is 60 m;the seismic reflection at the limestone top boundary has no change when the distance from fracture-cavity to the limestone top boundary is over 150 m,and the inside reflection presents moniliform.Based on the fine calibration of the actual drilling,the forward modeling result is verified.
引文
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