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UK-based independent Soco International reported Tuesday a significantly larger than expected pay zone at a recent discovery in its Marine XI block offshore Congo-Brazzaville.

Testing at the company’s Lidongo X Marine 101 well (LXM-101) “significantly exceeded pre‐test expectations,” reaching a post stimulation fracpeak rate of 5,174 barrels of oil per day and 3.65 million standard cubic feet of gas per day.

The well encountered oil in a clastics sequence in the Djeno sand formation with drilling shows and early log interpretation indicating a 50 meter gross interval.

Testing over a perforated 20 meter section produced at a stable average flow rate of 4,800 barrels of oil per day and 3.5 million cubic feet of gas per day on a 56/64” fixed choke, with a flowing wellhead pressure of 778 psi following the successful execution of the stimulation frac.

The oil quality was 32 degrees API.

The well is located 14 miles northwest of Pointe Noire in water depths of about 147 feet and was drilled to a total depth of 8,743 feet.

The well results will now be analyzed to determine the continuity of the find with the nearby discovery in the Marine XII Block.

Soco holds a 40.39 percent interest in the Marine XI Block.

Project partners are El Paso-based Western Refining with a 23 interest, National Petroleum Company of the Congo (SNPC) with a 15 percent share, Little Rock-based Arkansas Oil and Gas Company with a 13.11 percent share and PetroVietnam Exploration and Production with a 8.5 percent share.