层状盐岩溶蚀形态特征及主要影响因素

中国石油天然气股份有限公司盐穴储气库技术研究中心

储气库;层状盐岩;盐腔形态;影响因素;偏溶

Morphological features and main influencing factors of cavities leached in layered salt rocks
ZHOU Donglin, WANG Lidong, JIAO Yujia

PetroChina Research Institute of Salt Cavern Gas Storage Technology

gas storage, layered salt rock, cavity morphology, influencing factors, differential dissolution

备注

中国盐岩大多以层状产出为主,盐岩地质条件复杂多变,盐层溶腔形态各异,研究层状盐岩溶蚀成腔的形态特征和主要影响因素,可以为优化造腔工程设计、高效建设储气库提供参考。利用金坛、楚州、五里铺及应城等盐矿的盐层地质资料、生产资料、腔体声呐检测数据,从生产方式、造腔排量、埋藏深度、盐岩品位、夹层厚度及地层倾角等方面分析了各因素对盐腔形态的影响。结果 表明:金坛和楚州地区盐腔形态较为规则,五里铺腔体形态和应城盐矿盐腔形态不规则,单井对流或双井对流溶蚀形成的腔体形态相近,盐腔的溶蚀形态是多种因素综合作用的结果,其中盐岩品位和夹层是影响腔体形态规则的主要因素,地层倾角是造成腔体偏溶的决定性因素。研究结果可为储气库井位设计和造腔设计提供依据。(图4表1,参[25]

Salt rocks in China are mostly layered and their geological conditions are complex and diverse, so the cavities leached in salt layers are morphologically different. Therefore, researching the morphological features of cavities leached in layered salt rocks and their main influencing factors can provide the reference for the optimal design of leaching engineering and the efficient construction of gas storage. In this paper, the effects of various factors on cavity morphologies were analyzed from the aspects of production mode, leaching displacement, burial depth, salt rock grade, interlayer thickness and stratigraphic dip using the geological data of salt layer, the production data and the sonar detection data of cavity in Jintan, Chuzhou, Wulipu and Yingcheng Salt Mine. It is shown that the cavities in Jintan and Chuzhou are morphologically more regular and those in Wulipu and Yingcheng are irregular. The cavities leached by single-well or double-well convection are morphologically similar. Cavity morphology is the combined result of many factors, among which, salt rock grade and interlayer are the main factors influencing the regularity of cavity morphology, and stratigraphic dip is the decisive factor causing the differential dissolution of cavity. The research results provide the basis for UGS well design and cavity leaching design of gas storage. (4 Figures, 1 Table, 25 References)