摘要
裂缝储层是一种各向异性储层,在油气勘探开发中,利用地震资料进行裂缝储层的预测一直是个难题.随着地震勘探技术的提高,近几年研究人员开始尝试利用"宽方位、宽频、高密度"资料的"宽方位"特性预测裂缝或者利用常规资料的曲率、相干、蚂蚁追踪等几何属性预测裂缝,但目前实例大都局限于裂缝密度即裂缝发育带的预测,对于裂缝开启性的地震预测,几乎没有涉及.近几年Nissen及Guo Yanxia等提出利用叠后地震资料曲率属性计算方位强度的流程,认为可以预测裂缝的开启性.本文重建了上述流程,首先进行曲率计算,即计算最大正曲率、最大负曲率数据体,随后对曲率进行加权比例化,即曲率增强;然后对比例化的曲率体分方位滤波,求出不同方位的曲率子体,最后利用平面任意点到裂缝的径向距离的倒数脉冲序列与不同方位曲率子体褶积,得到不同方位的方位强度属性.在哈萨克K油田的裂缝预测中,预测结果与产能具有较高相关性,基于预测结果提出的钻井获得了较好的勘探效果.
Fracture is a kind of anisotropic reservoir whose prediction based on seismic data is a big challenge in the petroleum exploration.In recent years,as the improvement of the seismic exploration technique,some attributes such as curvature,coherence,ant tracing based on regular seismic data or others based on‘Wide azimuth,broad band,high density’data have been applied to the prediction of fracture.However,most of the current application all focused on the prediction of fracture density or fracture developing area,almost no technique involved in the prediction of the fracture openness.A workflow of azimuthal intensity based on curvature attribute was put forward by Nissen and Guo Yanxia,who think the azimuth intensity could be applied to predict the fracture openness.In this paper,the workflow was constructed by the calculation of curvature dataset,enhancement of the curvature,azimuth filter,convolution of curvature sub-dataset with impulse response,finally,the azimuthal intensity was derived.In the fracture prediction of the N oil filed in H country,good effect has been achieved.
作者
陈志刚
马文杰
赵宏忠
许凤
崔全章
孟阳
郭建明
CHEN Zhi-gang();MA Wen-jie;ZHAO Hong-zhong;XU Feng;CUI Quan-zhang;MENG Yang;GUO Jian-ming(BGP Geological Research Center,Zhuozhou 072751,China;China National Oil and Gas Exploration and Development Corporation(CNODC),Beijing 100034,China)
出处
《地球物理学进展》
CSCD
北大核心
2020年第5期1745-1750,共6页
Progress in Geophysics
基金
国家科技重大专项(2016ZX05029005)
中石油集团重大科技专项(2019D-4307)资助.
关键词
裂缝型储层
各向异性
曲率
方位强度
开启裂缝
Fractured reservoir
Anisotropy
Curvature
Azimuth intensity
Fracture openness
