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根据胜利油区的地层渗透率、孔隙度,在27个低渗透油田和46个中、高渗透油田的放射性同位素测井中进行了粒径为100~300μm、300~600μm、600~900μm放射性同位素131Ba微球粒径选择实验,确定了放射性同位素131Ba微球的选择原则。当油藏渗透率K<100×10-3μm2、孔隙度<20%时,放射性同位素粒径为100~300μm;当油藏渗透率K>100×10-3μm2、孔隙度>20%时,放射性同位素粒径为300~600μm或600~900μm。在此基础上得到胜利油区选用同位素粒径明细表,对于指导施工,提高放射性测井资料的可靠性具有重要意义。
According to the formation permeability and porosity in Shengli Oilfield, radioactive isotope logging with particle sizes of 100 ~ 300μm, 300 ~ 600μm and 600 ~ 900μm in radioactive isotopes of 27 low permeability oilfields and 46 medium and high permeability oilfields 131Ba microspheres particle size selection experiments to determine the selection principle of radioisotope 131Ba microspheres. When the reservoir permeability K <100 × 10-3μm2, the porosity <20%, the radioactive isotope particle size is 100 ~ 300μm; when the reservoir permeability K> 100 × 10-3μm2, the porosity > 20% , The radioisotope particle size is 300-600 μm or 600-900 μm. On this basis, it is of great significance to get the isotope size selection of Shengli Oilfield, which will guide the construction and improve the reliability of the radioactive log data.