WHY GAS IS TRAPPED STRATIGRAPHICALLY SHALLOWER THAN OIL IN NIGER DELTA

George I. Unomah Mobil Producing Nigeria Lagos The Tertiary Niger delta with more than 12,000 m of miogeosynclinal clastic wedge, which is partitioned into depobelts by east-west major structure building faults, is the habitat of 20-30 billion bbl of oil and more than four times the equivalent in gas (Fig. 1). Three formations are recognized. They are, from the lowest, the Akata formation, Agbada formation, and Benin formation. The Akata and Benin formations are composed of mainly marine shale

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