The La Honda oil field is located in San Mateo County in the Santa Cruz Mountains. The discovery well of the Eocene pool was the Neaves-Union Lane No. 2, completed in October, 1956, from the interval 1,728-1,741 feet, with production coming from the Butano sandstone of Eocene age. Initial production flowing was 90 b/d, 15% cut, 32.8°, 50 mcf. The pool extent was delineated rapidly with the drilling of six additional flowing wells, some of them whipstocked.

The best well in the pool was completed flowing with an initial production of 750 b/d, clean 32.8° oil through an open bean. At peak production the pool was producing 900 b/d under restricted choke. There is approximately 20 acres of accumulation. As of October 1, 1960, the field has produced an approximate total of 460,000 bbls. net oil and has a present daily rate of 225 bbls. net oil.

The surface geology is a westerly dipping monocline in the exposed Purisima (Pliocene) beds. The producing structure is anticlinal under the Pliocene unconformity with no surface evidence of this hidden fold. The discovery was based on the dipmeter results and stratigrapby of the Neaves-Union Lane No. 1 well.

The stratigraphic section in the field consists of the Purisima, San Lorenzo, and Butano formations.

Thirteen additional wells, all dry and abandoned, have been drilled in the immediate area by Neaves-Union, as well as other operators. The information from these wells show the accumulation to be at the very top of a large anticlinal structure hidden beneath the Purisima.

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