Accumulation models of tight oil in Fuyu reservoir of Sanzhao area in Songliao basin

The hydrocarbon source rocks of Qingyi member in Sanzhao area of Songliao basin are characterized by big thickness, high and mature organic carbon content. The reservoir space of Fuyu reservoir is mainly of remaining intergranular pores and feldspar karst pores. The hydrocarbon accumulation and distribution are controlled by the faults and there are three reservoir types, the fault reservoir, the lithology-fault reservoir and the lithology reservoir, with the characteristics of superposition distribution in section and continuous distribution in plane. The hydrocarbon source rocks of Qingyi memberand Fuyu oil reservoir belong to the source-reservoir relationship of ‘upper source and below reservoir', which has the vertical direct hydrocarbon accumulation model, vertical indirect hydrocarbon and lateral direct hydrocarbon accumulation models.