THE GEOLOGICAL PROPERTIES OF NATURAL GAS AND EXPLORATION PROSPECTS OF UPPER PALEOZOIC IN TABAMIAO AREA, NORTH ORDOS BASIN

Tabamiao area is situated in Yishan slope of Ordos Basin.The coal and dark mudstone beds in Taiyuan and Shanxi Formations possessed favourable hydrocarbon generation ability.Sandbodies which deposited in river channels,fan deltas and tidal flat are main reservoirs.Multiple source-reservoir-cap assemblage in vertical provided favourable condition for gas pool forming.The natural gas resource of Upper Paleozoic in Tabamiao area is up to 6 174×10⁸m³ and its proved rate is only 11% at present.Therefore,the Upper Paleozoic in Tabamiao area is favourable for gas exploration.It is considered that the reservoir characteristics was controlled by the sedimentary microfacies and the future exploration should be focused on search for lithologic traps in Tabamiao area.