金坛盐穴储气库腔体畸变影响因素

Factors affecting cavities distortion of Jintan Salt Cavern Gas Storage

金坛储气库在建设过程中,腔体不同程度地存在形状不规则的特点,分析腔体形态发育情况,找出腔体形态畸变的关键因素,并在后续造腔过程中加以控制,对于保障储气库经济效益和安全生产具有重要意义。基于金坛储气库的地震、测井和造腔数据分析,从地质和工艺两个方面出发,研究了多种因素对于盐穴形态变化的影响,结果表明:金坛储气库盐穴所处的构造位置、夹层的展布、不溶物的分布对盐穴的畸变无明显影响;而夹层数量和夹层厚度是影响盐穴形态的主要因素;溶腔速率的增大,会导致盐穴畸变;油垫层的位置和厚度会影响盐穴的形状;停井静溶期间,因卤水很快达到饱和,对腔体形态不会产生影响。目前,国内对于该问题的研究尚属空白,处于探索阶段。

During the construction of Jintan Gas Storage, the cavities are irregular in shape to a various degree. The development conditions of cavity morphology, the key factors affecting cavities distortion are figured out, and these factors are controlled in later cavity making process, which is of great significance for the economic benefit of gas storage and safe production. Based on the statistic analysis of Jintan Gas Storage＇s seismic, log and cavity making data, multiple factors affecting salt caverns＇ morphological changes are investigated from geology and technique aspects. Results show that the structural locations, interlayer layouts and distribution of insoluble substances of Jintan Salt Cavern Gas Storage do not have much effect on salt caverns＇ distortion, while the number and thickness of interlayers are the main factors affecting salt caverns＇ morphology. The increase in cavity dissolution rates would lead to salt caverns＇ distortion. The location and thickness of oil cushion layers would affect salt cavern＇s shape, and during the period of well-resting and static solution, the condition in a rapid saturation of brine does not affect salt cavern＇s distortion. At present, research on this topic is still a blank in China, and still in exploring stage. （8 Figures, 2 Tables, 6 References）