基于反射率法正演模拟的含气储层反射系数频变规律研究  

Research on frequency variation law of reflection coefficient of gas reservoir based on forward modeling with reflectivity method

作　　者：蒯正杨 梁锴[1] 张世鑫 韩文明 曹丹平[1] KUAI Zhengyang;LIANG Kai;ZHANG Shixin;HAN Wenming;CAO Danping(College of Earth Science and Technology,China University of Petroleum(East China),Qingdao 266580,China;CNOOC International Limited,Beijing 100028,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国海洋石油国际有限公司,北京100028

出　　处：《山东科技大学学报（自然科学版）》2024年第2期68-78,共11页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(42325403,42074162);崂山国家实验室科技创新项目(LSKJ202203400)。

摘　　要：振幅随偏移距/入射角的变化(AVO/AVA)技术已在油气勘探中广泛应用,其随频率的变化特征对岩性研究、储层预测和油气检测具有重要的指示作用。频变特征不仅与含气储层自身吸收衰减产生的速度频散有关,还与地震波在储层顶底之间发生的多次反射有关。本研究基于反射率法建立层状介质的频变反射系数递推公式,利用Chapman模型引入频散速度,提出一种充分考虑含气储层本身吸收衰减与层状结构的AVO精细模拟方法。并在此基础上深入分析了含气储层的厚度、含气饱和度、孔隙度及渗透率与频变反射系数之间的关系,为采用频变规律开展含气储层识别提供了依据。Amplitude variation with offset/incident angle(AVO/AVA)has been widely used in oil and gas exploration,and its variation characteristics with frequency play an important indicative role in the study of lithology,reservoir prediction and gas and oil detection.The frequency variation characteristics are not only related to the velocity dispersion caused by the absorption and attenuation of the gas reservoir itself,but also related to the multiple reflections of seismic waves between the top and bottom of the reservoir.In this study,the recurrence formula of frequency-varying reflection coefficient of layered media was established based on the reflectivity method.By using Chapman model,the dispersion velocity was introduced and an AVO fine simulation method that fully considering the absorption and attenuation and layered structure of gas reservoir itself was formed.Finally,the relationship between the thickness,gas saturation,porosity,permeability of the gas reservoir and the frequency-varying reflection coefficient was deeply analyzed.This study provides a basis for using frequency variation law to identify gas reservoir.

关 键 词：含气储层 速度频散 多次反射 反射率法 频变反射系数 Chapman模型 

分 类 号：P631.4[天文地球—地质矿产勘探]