准噶尔盆地西北缘侏罗系稠油油藏岩性解释方法探讨

AN APPROACH OF LITHOLOGY INTERPRETATION OF JURASSIC HEAVY OIL RESERVOIR IN THE NORTHWESTERN MARGIN OF JUNGGAR BASIN

准噶尔盆地西北缘超覆尖灭带的浅层重质油油藏储层,为成岩作用较弱、胶结性差、物性好、沉积上以上剥下超为特征的砂岩和砂砾岩。由于含油岩层松软易碎,采用传统的常规方法取心收获率较低,难以建立满意的电性解释图版。为此,我们采用钻井、取心和多种测井信息资料,建立了浅层重质油油藏岩性解释方法,并用九_6区齐古组6口取心井和301口生产井进行了岩性解释验证,获得了较为满意的结果。

The shallow heavy oil reservoirs in the overlap pinchout belts of the northwestern margin of Junggar Basin are of sandstone and sandy conglomerate reservoirs characterized by minor diagenesis, poor cementation,good reservoir quality, erosion at upper part and overlap at lower part. Because oil reservoir rock is unconsolidated and frasile,however, drilling core is less available using conventional techniques. It is difficult to establish the electric interpretation prates with satisfaction. In this case,the approach of lithology interpretation in shallow heavy oil reservoirs was developed using a little data obtained from drilling, coring and various kinds of well logging techniques and was applied in 6 corewells and 301 producing wells to Qigu formation in the sixth region of District No. 9 in Karamay oilfield to perform rock interpretation test. The results were obtained with more satisfaction.