Determination of Lateral Extension of Hydrocarbon Concentration Sealing Caprocks by AVO Analysis

作     者：Li Weilian Li Weilian ( Key Laboratory for Hydrocarbon Accumulation Mechanism,Ministry of Education,China University of Petroleum,Beijing 102249,China)

作者机构：Key Laboratory for Hydrocarbon Accumulation Mechanism Ministry of Education China University of Petroleum Beijing 102249 China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2007年第4卷第4期

页      面：17-22页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

主　　题：AVO caprock hydrocarbon concentration sealing gas diffusion loss 

摘      要：The caprock is one of the key factors for a reservoir, especially for a gas reservoir. Whether the caprocks can block off the gas is of significance for the accumulation and preservation of the gas reservoir. In this paper, we use the Amplitude versus offset （AVO） seismic technique to determine the lateral extension of the hydrocarbon concentration sealing caprocks. The essence of this technique is to detect the variations of the reservoir bed physical properties by monitoring the variations of the reflection coefficient of seismic waves upon the interfaces between different lithologies. Generally it is used to indicate hydrocarbon directly. For the hydrocarbon concentration sealing caprocks, the change of hydrocarbon concentration may cause the change of physical properties of the caprocks. Therefore it is possible to evaluate the hydrocarbon concentration sealing ability of the caprocks by AVO. This paper presents a case study using AVO to determine the lateral extension of the hydrocarbon concentration sealing caprocks. The result shows that this method is helpful for the exploration of the region.