Address changes must be received in writing. Please send changes to Carrizo Oil & Gas, Inc., Attn: Division Order Department, 500 Dallas Street, Suite 2300, Houston, Texas 77002. Please include your name, old address, new address, social security number and signature, and if you have been receiving revenue payments your six digit owner number reflected at the bottom left hand corner of your check detail. Please send a copy of your marriage certificate to update your name as a result of marriage or a divorce decree if your last name changed due to divorce.