地震波衰减属性在储层含油气预测中的应用

Application on seismic wave attenuation attributes in prediction of reservoir oil and gas

杏南开发区高8-59、杏13-丁2-125区块扶余油层地层较厚、底部标志不明显、断层两盘厚度有差异、多个断堑打乱了地层厚度的分布规律,导致进行储层含油气预测比较困难。为了较为精确地预测出研究区储层的含油气有利区,首先对已钻井进行地震衰减属性分析然后结合正演模拟得出,频率衰减斜率属性对储层含油气性有较好的指示,从而将其应用到研究区储层含油气预测的工作中。同时引入岩性约束,得出研究区有利区带主要沿着北西向、呈条带状展布,并划分出了3类有利区。本研究提高了油气预测的精度,为流体检测及储层含油气预测提供了新的思路和方法。

The Fuyu oil layer in Gao 8-59 and Xing 13-Ding 2-125 blocks in Xingnan Development Zone is thicker,the bottom mark is not obvious,the thickness of two faults is different,and multiple fault grabs disrupt the distribution of stratum thickness,resulting in which is difficult to predict oil and gas content of reservoir.In order to more accurately predict the favorable hydrocarbon-bearing areas of the reservoirs in the study area.This study first analyzes the seismic attenuation attributes of the wells that have been drilled,and then combines with forward modeling to find that the frequency attenuation slope attributes have a good indication of hydrocarbon-bearing properties of reservoirs,so as to apply it to the prediction of oil and gas in the reservoir in study area.At the same time,lithology constraints are introduced,and it is concluded that the favorable areas in the study area are mainly distributed along northwest direction in a strip shape,and three types of favorable areas are divided.This research improves the accuracy of oil and gas prediction,and provides new ideas and methods for fluid detection and reservoir oil and gas prediction.