摘要
边缘检测技术是基于计算机图形学算法提取数据或图像中的边缘信息,使得沉积体的边缘或储层之间的不连续性更加突出,为储层描述提供了新的手段和思路.目标油田为河流相沉积,砂体平面上叠置连片分布,主要发育水下分流河口坝沉积微相,砂体内部多期砂坝之间叠置明显,多期砂坝之间储层连通性较差,为了精细研究砂体内部的连通性,进而研究砂体的剩余油分布,首先提取砂体的振幅属性,然后应用Robert梯度算子对振幅属性求取振幅梯度,得到砂体基于振幅的边缘检测属性,该属性对砂坝叠置处有显著的增强作用,能够提高砂体内部多期砂坝间储层叠置的刻画精度.振幅属性能够刻画砂体平面厚度变化,基于振幅属性的边缘检测属性能够刻画砂体内部砂坝的叠置,融合这两种属性,再结合沉积模式、油田生产动态和数值模拟信息,开展精细剩余油分布研究,为油田后期调整挖潜、提高采收率提供支持.边缘检测技术在渤海Z油田的储层连通性研究中取得了很好的效果.在相似沉积背景下,综合运用地震地质手段,可以作为油田开发过程中解决储层内部连通性问题的有力工具,该技术具有广泛的应用前景.
Edge detection technology is based on computer graphics algorithm to extract edge information in data or image,which makes the discontinuity between the edge of sedimentary body or reservoir more prominent,and provides a new method and idea for reservoir description.The target oilfield is fluvial facies deposit,mainly developed underwater distributary bar sedimentary microfacies.The reservoirs of multi-stage sandbars are overlapped obviously,but the reservoir connectivity is poor at the position where sand bars are overlapped.In order to study the internal connectivity of the target sand body carefully and further study the distribution of residual oil in the sand body,the gradient of amplitude is obtained by using Robert gradient operator.The amplitude gradient is called the edge detection attribute,which can significantly enhance the overlap of sand body,can improve the description accuracy of reservoir stack in sand body.By fusing the amplitude attribute and the edge detection attribute,the fusion attribute which can reflect the thickness change of sand body and the superposition of sand bar can be obtained.Combined with the sedimentary model,oilfield production performance and numerical simulation information,the remaining oil distribution research is carried out.Based on the result,a new adjustment well B26 was designed,and the actual drilling result of the well was low in water flooded and the initial production have no water.It proved that the sand body connectivity results were reliable and effectively guided the oilfield development.Edge detection technology has achieved good results in the study of reservoir connectivity in Bohai Z oilfield.Under the similar sedimentary background,the method can be used to search for oilfield potential and enhance the oil recovery in the later stage.The technology can be used as a powerful tool to solve the problem of reservoir internal connectivity in the oilfield development,and it has a wide prospect.
作者
刘传奇
宋俊亭
薛明星
LIU ChuanQi;SONG JunTing;XUE MingXing(Bohai Oilfield Research Institute of CNOOC Limited Tianjin,Tianjin 300459,China)
出处
《地球物理学进展》
CSCD
北大核心
2022年第2期844-850,共7页
Progress in Geophysics
基金
中海石油(中国)有限公司科技项目(CNOOC-KJ135ZDXM36TJ)资助.
关键词
边缘检测
储层连通
注采关系
剩余油分布
砂体叠置
Edge detection
Reservoir connectivity
Injection production relationship
Remaining oil distribution
Superimposition of sand body
作者简介
第一作者:刘传奇,男,1979年生,硕士研究生,高级工程师,主要从事地震资料解释和储层综合研究.E-mail:liuchq@cnooc.com.cn。
