Clay Compaction Study for the Evaluation of Gas Hydrocarbon Migration and Accumulation
BUSHI, A., Z. XHAFA, and F. MUHAJ
This study presents in a summarized form the main factors which have influenced the migration accumulation conditions of the commercial gasbearing beds discovered in Tortonian and Pliocene deposits in Pre-Adriatic depression.
Based on the geochemical studies, field data and concepts on sediment migration we drew these conclusions:
1. the chief role in gas migration and accumulation mechanism is played by the clay sediment compaction phenomenon which reflects on apparent connection between gas-bearing beds and accumulation zones.
2. It is noted a correlation between sandstone reservoirs sizes and their gas saturation.
3. Based on the clay thickness nature (their compaction, extension conditions and minerologic-petrographic composition) it is concluded that the sealing capacity of the clay caprock can effectively retain a gasbearing column twice as thick.
4. Complex analysis of the migration and the accumulation conditions of the proved gasbearing beds allows the anticipation of other beds.