砂泥岩薄互层饱和度及油气评价

Saturation and oil and gas evaluation of Thin inter-bed

长垣西部葡萄花油层主要为低渗砂岩储层,在低孔低渗砂岩储层中受泥层的影响,使薄砂层的电阻率偏低。为了得到砂岩的实际电阻率,就要考虑薄互层的影响,进行校正。通过对薄互层电阻率影响因素分析并运用双侧向数值模拟反演进行电阻率校正,对目的区域的岩样进行岩心实验,根据对实验以及测井资料的分析,并结合岩性、孔隙结构多种因素影响的作用,建立了变岩电参数阿尔奇饱和度模型,此外,运用束缚水饱和度对含水饱和度进行计算,由此来检验结果的准确性。结果表明:通过对目的层段深电阻率曲线校正后,电阻率有所增大,所估算的含油饱和度也变大,说明电阻率通过校正后,能改善含水饱和度估算精度性,与试油结论一致。

The Putaohua oil layer in the western part of the Changyuan Placanticline is mainly a low-permeability sandstone reservoir.In the low-porosity and low-permeability sandstone reservoir,affected by the mud layer,the resistivity of the thin sand layer will be low.In order to obtain the actual resistivity of sandstone,it is necessary to consider the influence of thin interbeds for correction.Through the analysis of the influencing factors of the resistivity of the thin protective layer and the use of dual lateral numerical simulation inversion for resistivity correction,the core experiment of the rock sample in the target area is carried out,based on the analysis of the experiment and logging data,combined with lithology and porosity The influence of multiple factors in the structure is established,and the Archie saturation model of the variable rock electricity parameter is established.In addition,the irreducible water saturation is used to calculate the water saturation to test the accuracy of the results.The results show that after correcting the deep resistivity curve of the target zone,the resistivity has increased,and the estimated oil saturation has also become larger.It shows that the resistivity can improve the accuracy of water saturation estimation after the correction.The oil conclusions are consistent.