Origin of nitrogen-rich natural gases in the California Great Valley: Evidence from helium, carbon and nitrogen isotope ratios

Details Origin of nitrogen-rich natural gases in the California Great Valley: Evidence from helium, carbon and nitrogen isotope ratios Origin of nitrogen-rich natural gases in the California Great Valley: Evidence from helium, carbon and nitrogen isotope ratios

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..851j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 4, pp.851-861

Computer Science

12

Scientific paper

Dry natural gases produced from the Sacramento and northern San Joaquin basins contain up to 87% nitrogen. 15 N measurements for gases with N 2 8% vary from 0.9%. to 3.5%.; methane 13 C values vary from -61%. to -15%. 3 He / 4 He ratios indicate the presence of mantle-derived helium in addition to radiogenic crustal helium and suggest that the gases may originate from mixing between three principal components: a hydrocarbon-rich gas with 3 He / 4 He 0.1 R A derived from the microbial and thermogenic alteration of sedimentary organic matter, a hydrocarbonrich gas with 3 He / 4 He 2.75 R A derived from the localized pyrolysis of sediments by magmatic volatiles, and a nitrogenrich gas with 3 He / 4 He 1 R A The nitrogen-rich component is characterized by methane 13 C less negative than -25%. and N 2 / Ar ratios as high as 22,000. Nitrogen concentrations tend to increase towards the basement along the shallow eastern margin of the valley suggesting that the nitrogen-rich component is derived from metasedimentary rocks deep within the crust. The Coast Ranges Fraciscan complex, which was thrust well beneath the Great Valley during Late Mesozoic and Early Cenozoic subduction, appears to be the most likely source.

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