鄂尔多斯盆地下寺湾油田柳洛峪区长7、长8储层特征研究及评价

Characteristics study and evaluation on the of Chang-7 and Chang-8 reservoirs in Liuluoyu Area of Xiasiwan Oilfield,Ordos Basin

鄂尔多斯盆地下寺湾油田柳洛峪区因储层致密、非均质性强、油水分布关系复杂和研究程度低,导致前期投产后单井产量较低,整体开发效果较差。为实现研究区长7、长8油藏的高效勘探开发,从沉积特征、岩石学特征、孔隙结构特征和物性特征四方面进行了深入研究。研究结果表明:长7储层大部分属于Ⅳ类(致密)储层,约占60%,Ⅲb类(差)储层次之,约占35%,少量Ⅲa类(较差)储层,约占5%;长8储层大部分属Ⅲb类(差)储层,约占50%,Ⅲa类(较差)储层、Ⅳ类(致密层)储层次之,分别占20%和30%。相关研究成果对下寺湾油田柳洛峪区长7、长8油藏后续的高效勘探开发具有一定的指导意义。

The Liuluoyu Area of the Xiasiwan Oilfield in Ordos Basin has tight reservoirs,strong heterogeneity,complex oil-water distribution and low research levels,resulting in low single-well productivity and poor development effects after initial production.In order to realize the high-efficiency exploration and development of the Chang-7 and Chang-8 reservoirs in the study area,sedimentary characteristics,petrological characteristics,pore structure characteristics and physical characteristics were deeply studied.The results showed that most of Chang-7 reservoir belong to IV(tight)reservoirs,accounting for about 60%.III b(poor)reservoirs accounts for about 35%.IIIa(poor)reservoirs accountes for about 5%.Most of Chang-8 reservoir belong to III b(poor)reservoirs,accounting for about 50%,and IIIa(poor)reservoirs and IV(tight layers)reservoirs account for 20%and 30%respectively.The results showed certain guiding significance for the subsequent high-efficiency exploration and development of Chang-7 and Chang-8 reservoirs in Liuluoyu Area of Xiasiwan Oilfield.