Study On The Reservoir-formed Model And Reservoir Prediction Of Budate Group In Sudeerte Structural Zone

The practice of petreleum exploration and development indicates that buried hill reservoir has been an important realm of searching for hydrocarbon resources and realizing aim to increasing petroleum reserves in petroliferous basin. In 2002, clastic buried hill reservoirs of Budate Group of Mesozoic is found in Sudeeerte structural zone, Hailaer Basin, which is one of peripheral basins of Daqing oilfield. Due to the complicated geological environments and lack of research, it is unclear for the type of buried hill reservoir, reservoir space type, reservoir forming mechanism, reservoir distribution, which have an serious effect on the schedule of petroleum exploration and development. The main purpose of this paper is to find out the characteristics of buried hill oil of Budate Group,to determine the lithology and electrical characteristics of the buried hill oil reservoir and identify effective thickness of reservoir. By studying oil-gas migration and accumulation mechanisms and reservoir-formed model of buried hills of Budate Group, to clarify oil and water distribution and the favorable accumulation areas of buried hill oil of Budate Group,which is favorable to favorable region prediction and the exploitation of oil fieldsIn this paper, some important results have been obtained: (1)The cross plot of density logs and microspherically focused log can better identify oil and water layers.(2)The cross plot of spontaneous potential logs and acoustic log can better identify permeable formation and impermeable formation. (3)Logging traces of high production reseroirs should have the following characteristics: serious drifting of the spontaneous potential baseline,which is relative to the overlying Xing'anling Group (total or partial drifting); abnormity features of acoustic (sudden increase of acoustic, that is low-speed); decrease of microspherically focused log,which is less than deep and shallow 3 lateral resistivity log in high production layers; abnormity features of density (sudden decrease of density, that is low-density). (4)For the layer of buried hills of Budate Group is low-grade metamorphic,severe fracture and greatly eroded. stratum correlation is guided by the seismic profiles under the tectonic model.(5) The original view that the oil of buried hills of Budate Group is mainly distributed in the rocks which is less than 150m away from the surface of buried hills,but some wells gaine commercial oil in the rocks which are deeper than 150m away from the surface of buried hills,which proves that the deeper layers will be a favorable oil-bearing property and used for perforation adding in development wells.(6)There are three accumulation models in the research area:â‘ the oil and gas which comes from the source rock of lower part of Nantun formation in the depression is accumulated in the basement crust of weathering whichi is in the top of buried hills along the fracture and unconformity in last Yimin period;â‘¡the oil and gas which comes from the source rock of lower part of Nantun formation in the depression is accumulated in the fracture zone which is in the buried hills along the fracture in last Yimin period;â‘¢the oil and gas of Bei 38 block which comes from the source rock of lower part of Nantun formation in the depression is accumulated in the buried hills which is intrusion from the overlying strata in last Yimin period.