Abstract:

 As an important part of gas resource and an important source of sulfur, the sulfurous gas has a great amount of global resources and distributes in a wide range, mainly in large oil and gas fields of North America, Europe, the former Soviet Union, the Middle East, Asia and other regions. These oil and gas fields have different geochemical property and different origination of sulfurous gas; the concentration of hydrogen sulfide gas(H2S)varies greatly in these oil and gas fields, from 017％ to 98％. According to the systematic investigation and study of global major oil and gas fields containing hydrogen sulfide, it is found that these oil and gas fields, located in a passive continental margin, are mainly distributed in Triassic and Carboniferous strata; that they have preferable reservoir properties, usually composed of gypsum and rock salt, and the location of gypsum has a great impact of the emergence of hydrogen sulfide; and that the favorable cap is an important condition for the accumulation and preservation of a large amount of hydrogen sulfide. A large amount of hydrogen sulfide are generally generated in the reservoir with the temperature equal to or higher than 120 ℃, and accompanied by a large amount of carbon dioxide generated.

Key words:  hydrogen sulfide, TSR, evaporate, distribution