ABSTRACT

A review of available geologic literature has indicated numerous references detailing the occurrences of hydrocarbon in igneous and metamorphic rocks. Notable among these references is a paper by Chung-Hsiang P'an (1982). Landes et al (1960) and a group of papers edited by Sidney Powers (1932). Collectively, these papers conclude a biogenic source for hydrocarbons, most of which occur in: (1) weathered igneous and metamorphic reservoir rocks that are higher than the source rocks (e.g., Amarillo field) or (2) igneous and metamorphic rocks that exert structural or stratigraphic control on the reservoir or source rocks (e.g., the Jackson Dome and the Wiggins Anticline-Conecuh Ridge). It should be noted, that a "new twist" on the abiogenic origin of some inert gasses (i.e., helium and nitrogen) proposes a degassing of igneous or metamorphic rocks from sources in the underlying mantle (Gold, 1980, 1985). Recent European "super-deep" tests (e.g., Sweden's Siljan Ring and U. S. S. R's Kola SG-3 testholes) have attempted, with mixed results, to verify this theory.

Drilling for deep igneous and metamorphic prospects today is considered at or below economic basement or worse, a rank wildcat. However, these plays should become increasingly commercial in the 1990's as deep drilling technology progresses, the current oil glut is eliminated, and more exotic gas prospects become accepted.