Figure 9. Example of oil discovery in a hanging-wall fault block. AA, AB, and AC sands are production zones with more than 50-m oil columns. AB and AC sands juxtaposed against Aradeiba intraformational shale across the fault to provide good lateral seal; AA and Bentiu sand juxtaposed against AB sand and Bentiu massive sand, respectively, but shale fault smear provided good lateral seal, resulting in a small oil column in Bentiu reservoir.