Abstract:

For the purpose of the finding of the relayed carbonate exploration field in Tarim basin, based on the research of structural evolution of peripheral area and the well analysis of the Hetianhe gas field, this paper sets up the Ordovician burial hill quasi-layered pool model in southern Mazhatage and fossil oil pool model of platform margin belt in northern Mazhatage. This paper points out three main Ordovician exploration areas: burial hill in southern Mazhatage, the platform margin belt in northern Mazhatage and the nappe structures in eastern Mazhatage, which is the relayed exploration area with one trillion stere nature gas. The burial hill in southern Mazhatage formed good carbonate reservoir for the actions of weathering and leaching in the long term exposure, and its overlaying Carboniferous shale and its updip compact limestone formed the good cap, and it also lays in the area of effective source rock, so it is a favorable exploration area. The platform margin belt in northern Mazhatage which superimposed the structure trap can trap the oil and gas, so it is a more favorable exploration area. Large-size drape traps developed  in nappe structures in eastern Mazhatage are potential exploration areas. 

Key words: peripheral area of the Hetianhe gas field, quasi-layered pool, platform margin belt, fossil oil pool