Research On Geological Features Of Triassic Reservoir In Taskuduk Oilfield,Pre-Caspian Basin

In regional structural zone,it is located in Astrakhan-Aktyubinsk uplift belt and the southeast of Sagiz block of central depression in Pre-Caspian Basin,the main oil-bearing series in T2?,T2?and T2? oil group.The reservoir distribution is mainly controlled by structure and lithology in the oilfield.The reservoir type is medium-high porosity,medium-low permeability and layer edge-bottom water reservoir.And on the plane,it is splited into multiple fault block and accumulation independently.On the longitudinal direction,oil interval layer is stable distribution and thus forming several oil-water systems.Reservoirs are mainly distributed in the north of 7 well-area,4 well-area and 406 well-area and in the south of 3 well-area,1 well-area and 2 well-area.Taskuduk oilfield was arid and semi-arid sedimentary environment and developed multi-superimposed sedimentary fan bodies on the horizontal and vertical,facies being blunt fan intermittent river and microfacies being water channel,channel lateral margin and inter-channel.The Triassic reservoir is mainly distributed into water channel of alluvial fan.Triassic reservoir belongs to high porosity and medium permeability reservoir,rock to hydrophilic,the oil layer is mainly distributed in alluvial fan in the channel,followed by distribution in the channel edge.On the plane,the calculated unit accorded the oil bearing area to determine one.On the vertical direction,it is mainly oil group as the unit and recalculation of the geological reserves of crude oil is 1550.8×104t.it is medium high abundance ratios oilfield.On the basis of comprehensive geological research,the paper pointed out the oil and gas enrichment region in the plane and the oil and gas enrichment layer section in the vertical in the study area,and put forward to 3 wells location for rolling development through argument for further production in the oilfield.