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Free- and Bound-Formation Water Correlation Within a Productive Series: South Caspian West Margin


Abdullayev, Elshan A., Azerbaijan State Oil Academy, Baku City, Azerbaijan


The main goal of initial investigation stage was to identify correlation between free and bound waters within Productive Series sandy and silty reservoirs. It was assumed that ini­tially captured amount of water while sediment deposition considering initial average poros­ity of shale to be 75% and sand/silt rocks to be 40%, and compaction ratios of those sedi­ments were taken as 2 and 1.5 respectively.

Core samples were used to evaluate average water-saturation of sand/silt rocks as 0.28 and shale rocks as 0.35.

Calculation of sand/silt rocks water saturation for Absheron and Baku Archipelagoes has been carried out separately as far as tectonic settings and Productive Series lithologic com­position of those settings differ significantly from each other. Then acquired data got summed up in order to infer Productive Series free and bound water captured by sand and silt deposits while sedimentation along with those released while diagenesis during 5•106 years of Lower Pliocene evolution time.

Recent residual free and bound waters have also been calculated for Productive Series sand/silt rocks.

Thus, the initial amount of free and bound waters captured by sand/silt sediments amounts to 8.025•103 cu km during 5•106 evolution years, whereas currently remaining amount of free and bound waters within those rocks amount to 4.425•103 cu km.

Actually just 40% of initially captured waters within Productive Series rocks have been released during its evolution time span. This phenomenon is accounted for due to the young geologic age of those deposits and slackened thermal subsurface environment that stipu­lates for low compaction rate of sand/silt sediments and insignificant amount of released free and bound waters.