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苏北盆地金湖凹陷西斜坡阜二段生物灰岩储层总体厚度薄,平面分布不均,横向变化快,厚度差异大,常规地震解释很难有效识别储层厚度。通过建立不同围岩组合、不同生物灰岩厚度的地震正演模型,明确了生物灰岩厚度与地震反射振幅、频率等的相关性。井震结合,通过优选与生物灰岩厚度变化相关性好的平均波峰振幅、主频属性预测生物灰岩储层分布。该方法对于薄层、非均质储层的预测具有较高的实用价值。
The bio-limestone reservoirs in Fu2 Member of west slope of Jinhu Sag in Northern Jiangsu Basin are generally thin in thickness, uneven in plane, rapidly changing in horizontal direction and large in thickness difference. It is difficult to effectively identify reservoir thickness by conventional seismic interpretation. Through the establishment of seismic forward model with different surrounding rock assemblages and different biological limestone thicknesses, the correlation between biological limestone thickness and seismic reflection amplitude and frequency is clarified. Combined with wellbore, the distribution of biogenic limestone reservoirs is predicted by means of averaged peak amplitudes and frequency dominant properties that are preferably correlated with changes in biogenic limestone thickness. The method has high practical value for the prediction of thin and heterogeneous reservoirs.