GLOGOS, A New Global Onshore Gas-Oil Seeps Dataset

摘要

Petroleum seeps have historically been important drivers of global petroleum exploration. Still today they can serve as direct indicators of gas and/oroil subsurface accumulations. In particular the assessment of the origin of seeping gas is a key task for understanding, without drilling, the subsurfacehydrocarbon potential, genesis and quality; e.g., the presence of shallow microbial gas, deeper thermogenic accumulations, the presence of oil andnon-hydrocarbon undesirable gases (CO2, N2, H2S). Seeps are then indicators of tectonic discontinuities (faults) and fractured rocks; they can alsorepresent geo-hazards and sources of greenhouse gas (methane) and photochemical pollutants (ethane and propane).A new global dataset of onshore gas and oil seeps (GLOGOS) is here presented. GLOGOS includes more than 1150 seeps from 84 countries (versionAugust 2009), and it is continuously updated and expanded. The dataset includes geographical and gas-geochemical data (molecular and isotopiccomposition of the main gases). Many seeps are recently discovered or never reported in other databases. Seeps are catalogued by country andclassified in three types: gas seeps, oil seeps and mud volcanoes. All seeps have a bibliographic or www reference. GLOGOS is a unique tool forhydrocarbon exploration, assessment of Total Petroleum Systems and geo- structural studies.