Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (3): 75-81.doi: 10.3969/j.issn.1673-8926.2015.03.011

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Geological significance and controlling factors of nonhydrocarbon fluid of Jiufotang Formation in Naiman Sag

SHU Lijuan   

  1. （ Liaoxing Oil & Gas Development Company ， PetroChina Liaohe Oilfield Company ， Panjin 124010 ， Liaoning ， China
  • Online:2015-05-26 Published:2015-05-26

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Abstract:

The nonhydrocarbon fluid in Naiman Sag of mainly refers to CO2, H2S and N2. Through component analysis of oil-associated gas, combining with regional tectonic history, nonhydrocarbon fluid content and carbon isotopic analysis, this paper studied the genesis, time entering into the reservoir and controlling factors of preservation and distribution of the nonhydrocarbon fluid in Naiman Sag. The result shows that CO2 and H2S in Naiman Sag come from mantle-derived magma eruption, prior to entering the reservoir of oil and gas. The enrichment degree of CO2 in formation water is directly proportional to the concentration of HCO3-. Nature of H2S is not stable, and exists in the form of trace H2S, organic sulfur compounds and pyrite nodules at present. The enrichment degree of H2S and organic sulfur compounds is proportional to the concentration of SO42-. The atmospheric N2 came into the reservoir at the late Yanshan tectonic uplift, and enriched in the vicinity of shallow strata and shallow fault. The distribution characteristics of sand bodies control the plane distribution rule of nonhydrocarbon fluid. Thickness of mudstone and configuration relation between mudstone and sandstone decided the preservation conditions of nonhydrocarbon fluid. The research results provide theoretical basis for next exploration deployment in Naiman Sag.

Key words: nonhydrocarbon fluid, cause analysis, distribution, controlling factors, Naiman Sag

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