The presence of biogenic gas doesn't preclude the existence of thermogenic products, either gas or oil, nearby. There are many oil and gas fields where biogenic gas is found either in shallower reservoirs of the field, or nearby. I wrote a post several days ago regarding the anomalous juxtapositioning of Noble Energy's biogenic gas field offshore Ecuador with that of BPZ's oil and gas field only 15 miles away. Both fields produce from similar depth. Its difficult to explain biogenic/thermogenic distribution there. JDZ exploration is still in its infancy; even less is known about this area.
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