VSP资料在盐穴储气库构造特征描述中的应用

随着世界各国对天然气需求量不断增加，为确保能源安全，调节天然气季节性供需矛盾，建设地下储气库是一种较为先进的办法。随着中国盐穴储气库的大规模兴建，对目标盐岩矿的准确分析与评价，是储气库建设成功的关键。在河北宁晋地区盐穴储气库建设过程中，由于地面地震资料少，遇到了地下盐体地质构造难以描述的问题。为此，提出了利用VSP资料对宁晋盐穴储气库的构造特征进行描述。首先，在该区部署了零井源距、Walkaway、Walkaround VSP资料采集；通过对VSP资料的处理，获得了VSP走廊叠加记录、Walkaway VSP成像剖面、Walkaround VSP数据及其插值成的三维数据体；综合利用零井源距VSP资料、Walkaway VSP成像数据、Walkaround VSP三维插值数据体，分别从点、线、面、体的角度对探区内石盐体进行研究，描述了探区内石盐体的几何形态和断层分布，预测了裂缝发育方向。该成果对宁晋地区盐穴储气库建设具有一定的指导意义。

Application of VSP data in describing structural characteristics of salt cavern gas storage

The world's demand for natural gas is increasing. For the sake of ensuring energy security and regulating the seasonal contradiction between supply and demand,it is an advanced method to build underground gas storage. With the large-scale construction of salt cavern gas storage in China,the accurate analysis and evaluation of the target salt mine is the key to the successful construction of gas storage. During the construction of salt cavern gas storage in the Ningjin area,Hebei Province,it is difficult to describe the geological structure of underground salt bodies due to the lack of surface seismic data. Therefore,the paper proposes to use VSP data to eva-luate the geological conditions of salt cavern gas storage construction in Ningjin area. First,Zero-offset,Walkaway and Walkaround VSP data acquisition are deployed in this area. Through the processing of VSP data,the VSP corridor stack profile,Walkaway VSP imaging profile,Walkaround VSP data and their interpolated 3D data volume are obtained;The Zero-offset VSP data,Walkaway VSP imaging data,as well as Walkaround VSP three-dimensional interpolated data volume are comprehensively used to study the salt body in the exploration area from the point,line,plane,and body angles,describe the geometric shape and fault distribution of the salt body in the exploration area,and predict developing direction of the fracture. This achievement are of certain guiding significance for the construction of salt cavern gas storage in the Ningjin area.