陇东地区X井区特低渗储层物性改造地震预测研究

Seismic Prediction of Physical Modification of Extra-Low Permeability Reservoirs in X-Well Zone, Longdong Area

摘要: 陇东地区X井区长8₁₂油层组属于典型的低孔、特低渗储层，需要借助压裂储层物性改造技术开发储层。为了有效预测研究区目的层剩余油分布，进一步落实开发部署方案，亟需对改造后的储层物性进行定量预测。本文以相邻工区压前–压后声波曲线建立数学关系，利用研究区声波曲线换算压后声波值，并通过声波与孔隙度的拟合关系计算研究区压后孔隙度曲线，结合压裂后三维地震数据，采用地震波形指示反演，定量预测研究区目的层物性改造后的储层物性。孔隙度地震预测平面结果表明，压裂区域平均孔隙度明显高于周围区域，且孔隙度预测值分布范围与实际相符，预测结果可靠。

Abstract: Chang 8₁₂ oil layer group of the Longdong oilfield is a typical low porosity and ultra-low permea-bility reservoir, which is necessary to develop reservoirs by means of fracturing reservoir physical property modification technology. In order to achieve effective prediction of the remaining oil in objective intervals and further implement the development and deployment plan, it is necessary to quantitatively predict reservoir physical properties after reconstruction. In this paper, the mathematical relationship is established based on adjacent area pre- and post-compression acoustic curves. The acoustic wave value after pressure is converted by using the acoustic wave curve of the study area, and the post-compression porosity curve of the study area is calculated by the fitting relationship between the acoustic wave and porosity. Combined with 3D seismic data after fracturing, seismic waveform indication inversion is used to quantitatively predict the reservoir physical property of the objective interval in the study area. Porosity seismic prediction plane results show that the average porosity of the fractured area is significantly higher than that of the surrounding area and the predicted distribution range of porosity is consistent with the actual, the predicted results are reliable.