平顶山盐穴储气库建库地质条件评价

 在平顶山盐岩矿区三维地震解释、资料井及老井钻探成果基础上,对研究区断裂发育、构造形态及盐岩地层横纵向展布特征进行精细研究,并对盖层和夹层分别取心开展室内实验以评价盖层及夹层密封性。通过对平顶山地区盐岩建库地质条件的综合评价,认为该地区适合建设盐穴地下储气库。结果表明:平顶山盐矿总体构造形态简单,盐岩沉积中心断裂不发育且盐层厚度较大;盐岩地层厚度大,横向分布稳定,其中14~20 盐群厚度平均200 m 以上,含矿率高,夹层数量少,可以作为建库的目的层位;盖层及夹层以泥岩为主,微观孔喉结构小,连通性差,渗透性能差,不利于气体的运移,具备一定的封闭能力,满足储气库地质评价要求。

Geological condition evaluation for establishing gas storage in Pingdingshan salt cavern

In this paper, research is taken on the characteristics of fault, structure and salt layer distribution both on horizontal and vertical surfaces in Pingdingshan area, based on previous achievement such as three-dimensional seismic interpretation, drilling well and old well data. The sealing ability of the cap and the mezzanine is assessed by indoor experiment. Through the above comprehensive evaluation on geological condition, the underground gas storage construction is considered feasible. The study shows the followings. Firstly, the overall structure of the study field salt ore is simple with a small amount of faults and a large thickness of salt layer in the center of deposition. Secondly, the salt is thick and the lateral distribution is stable, where the average thickness of 14 to 20 salt groups is more than 200 meters. What's more, the salt ore content is high and the mezzanine number is little. Therefore, the object layer can be chosen to be there for database building. Thirdly, the sealing ability is also good enough to establish the gas storage, as the lithology of cap and mezzanine is mainly mudstone, with small microscopic pore throat in size, poor connectivity and permeability and bad transportation ability of gas.