Miner Willard Buell Jr., 66, who retired in 1970 after 28 years as an oceanographer for the Navy Hydrographic and Oceanographic Office, died Tuesday at the National Orthopaedic & Rehabilitation Hospital in Arlington of complications following a stroke.

Mr. Buell was born in Kittery, Maine, and moved to this area at an early age.

He worked for the U.S. Geological Survey, the Army Corps of Engineers, and then for the hydrographic office. He made a number of trips to the Caribbean, the Arctic, and along the Continental Shelf, helping chart ocean bottoms.

Mr. Buell was president of the Oakmont Citizens' Association, and a member of the Maryland Municipal League. He had been Maryland director of the Izaak Walton League.

He also was a member of St. Columba's Episcopal Church in Washington.

Survivors include his wife, Sylvia, and a son, Dennis, of the home in Bethesda; three other sons, Miner W. III, of Callaway, Md., James, of Flanders, N.J., and Brian, of Houston; a daughter, Sylvia L. Hoska, of West Berlin: a sister, Ruth Hodgson, of kensington. and six grandshildren.

The family suggests that expressions of sympathy be in the form of contributions to the C. Randolph Mengers-Sylvia J. Buell Scholarship Fund at St. Columba's.