E. Texas Cotton Valley pinnacle reef play expanding

G. Alan PetzetExploration Editor A third East Texas Jurassic Cotton Valley lime pinnacle reef discovery in two years has jump started a play that began in the early 1980s. Driving the play is Marathon Oil Co., which has been keying off two early 1980s discoveries and extensively employing 3D seismic technology to evaluate Cotton Valley reefs at 14,000-15,000 ft. TXO Production Corp., which Marathon later acquired, made the earlier discoveries. Marathon said it has secured more than 40,000 net acres containing a large inventory of reef prospects. It is running one rig full time, and plans to add one or two others periodically. The most recent discovery, Marathon's 1 Riley Trust...

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