请给出以下材料中钻井液的成分分析，并以特定key-value结构呈现：{"Liquid":"H2O", "Solid":"Bentonite", "Additive":"CaCl2", "Weight":"12.5 ppg"}。
user
{
  "Liquid": "H2O",
  "Solid": "Bentonite",
  "Additive": "CaCl2",
  "Weight": "12.5 ppg"
}
assistant