Methods To Determine The Lower Limits And Control Factors Of The Tight Sandstone In Fuyu Layer Of Northern Songliao Basin

摘要

The northern part of Fuyu layer in Songliao basin tends to high-quality hydrocarbon in Qingshankou formation as source rocks, tends to three or four section of Quantou Formation as reservoir which is of tight reservoir .The average value of porosity in the reservoir of tight sandstone is 11.8%,the average value of permeability is 2.3mD,it belongs to typical reservoir which is low porosity and low permeability. In this paper, we combine with the static and dynamic data, comprehensively use empirical statistical method, oil occurrence method, conclusion evaluation of test oil and so on 3 methods, it determine that the lower limit of porosity in tight sandstone reservoir is 5% in the northern part of Songliao Basin in Fuyu reservoir, the permeability is 0.03mD, which combine with Rock electricity,we establish the division standard of tight oil reservoir.On basis of the standard, we finish 1700 old wells re-examination, rediscover the distribution of reservoir. It determine that The remaining resources are mainly distributed in tight reservoirs with the porosity of 5-12%, the permeability of 0.03-1mD, find out the area 's potential of tight oil resource , it lay the foundation for the next step of comprehensive and effective development in tight oil.