Hydrogen sulfide treatment method for crude oil/sour gas

A method of removing hydrogen sulfide from a subterranean geological formation, comprising:

• injecting a drilling fluid suspension into the subterranean geological formation through a borehole drilled in the subterranean geological formation,
• wherein the drilling fluid suspension comprises a nanocomposite material comprising a layered triple hydroxide material comprising copper, magnesium, and iron, and a zeolitic imidazolate framework-67,
• wherein the drilling fluid suspension has a pH of 10 or more,
• wherein the nanocomposite material is present in an amount of 0.01 to 1.5 percent by weight of the drilling fluid suspension,
• circulating the drilling fluid suspension in the subterranean geological formation and forming a water-based mud;
• and
• scavenging the hydrogen sulfide from the subterranean geological formation by reacting the hydrogen sulfide with the nanocomposite material in the water-based mud,
• wherein the hydrogen sulfide is present in a formation fluid comprising a sour gas or sour crude oil.