Evaluation Of Nanyishan Shallow Reservoir Ⅲ+Ⅳ Oil Group Non-main Layer Of Qaidam Basin

The Nanyishan shallow reservoir Ⅲ+Ⅳ oil group of Qaidam Basin,was the reservoir Northwest areawhich have development longer time.And the reservoir properties is Low porosity and low permeability,Poor reservoir property and complex lithology, Production of electric and oiliness characteristics is not easyto identify.The result is difficult to recover. Ⅲ+Ⅴoil group (depth of600-1600m) of Nanyishan shallow oilreservoir was divided into up to118small layers, most of layers Ⅲ+Ⅳ oil group were17+18,40and49layers before2007,there was a small part of the well put into a25,28,30layers, none of the remainingsmall layer production. From December2006,six new and old wells "non-main" layer were put intoproduction/complement hole transformation, achieving good effect. A series of studies were done with"non-main" layer of Ⅲ+Ⅳ oil group of Qinghai Oilfield Nanyishan shallow oil reservoir to provide ascientific basis for the future tapping the potential production of old wells.This paper was based on existing geological studies, with analysis characteristics on lithology,electrical and others, Ⅲ+Ⅳ oil group of Nanyishan shallow reservoir "non-main" layer distribution lawand its production of the producing formation was evaluated, combining logging data,"non-main"producing layer distribution similar to South shallow3-6wells was ascertained, some "non-main" layerwas preferred to test mining, the law of "non-main" layer distribution was sorted out,combined with trialmining results, a number of "non-main" layer with high capacity were utilized to provide a basis forfurther development spend. Electrical measurement interpretation model of Nanyishan Ⅲ+Ⅳ Oil groupwas established with the interpretation of the porosity, oil saturation, and by constitutive painted contourmaps and with the work of core analysis data comparison. The low limit of oil saturation was clear basedon "non-main" production layer, preferred area has been voted "non-main producing formation in the futuredevelopment was determined," non-main "layer reserve put into the production was calculated;According to the well section on according to the well section distribution on each layer, combined with thefeasibility of the production and the fracturing process,15small layer were superimposed in batches todetermine the preferred area, it was thought that "non-main layer with great potential area for developmentwas mainly distributed in the constructor of the western end, with the spread of the" main "productionlayer.Through the research of this paper, the conclusion has an important meaning for enchaning productionand founding potentialities in Nanyishan shallow reservoir Ⅲ+Ⅳ oil group. Up to now has been put intooperation in non-active layers, cumulative increase of more than3.5Million tons of crude oil,Made a verygood development effect and economic benefit.. The research also made great contribution in recent yearsin the reservoir measures and follow-up for production replacement work. Similarly to the Qinghai northwest reservoir of Qaidam Basin with high mud content, low porosity, low permeability and lowresistance to oil and gas reservoir recognition and understanding and new breakthrough..