I saw where a comment was made to you that you did not have to worry about sour gas or H2S in North Caddo Parish. There are some areas of shallow production in NC around Caddo Pine Island that sour gas is produced to some extent. This area was fire flooded at one time which may have created some of the problems. It is not wide spread but it is a possibility. It is and has been found in the deeper smackover formation in extreme NE Caddo Parish as well.

Hope this has helped you.