东濮凹陷薄砂岩储层有效识别技术

东濮凹陷砂岩储层埋藏深、厚度薄、横向变化快，常规地震资料已不能满足储层精细描述的要求。针对该区薄砂岩储层特征，利用谱反演和分频解释技术将时间域的地震信号变换到频率域，获得较原始地震数据更加丰富的数据信息，在此基础上进行模拟退火波阻抗反演和广义多属性拟合综合预测。预测结果表明：谱反演和分频解释技术有效提高了薄储层的分辨率；模拟退火反演精确预测出薄砂岩储层的厚度；而广义多属性拟合技术精确刻画出薄砂岩储层的平面展布范围。多种方法综合最终有效预测出薄砂岩储层的空间分布规律，经钻井证实可靠。

The effective identification technique of thin sandstone reservoir in Dongpu depression

The sandstone reservoir in Dongpu depression is deep and thin,changes fast laterally,conventional seismic data can't finely describe the reservoir characteristics.Seismic reservoir prediction technologies such as spectrum inversion,frequency division interpretation,simulated annealing inversion and multi-attributes must be used to study the thin reservoir characteristics.The first process is to use spectrum inversion and frequency division interpretation technology,transform time domain seismic data into frequency domain,the second step is to use simulated annealing inversion to confirm the thickness of thin sand,then to use multi-attributes such as wave impedance,frequency and arc length and so on to predict the sand distribution ranges.They were used synthetically to reduce the multi-solution of prediction results.The results offered us the accurate spatial distribution of thin sand reservoir filled with oil and gas.The prediction results were verified by drilling and could guide the further exploration.