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通过研究泥浆侵入对电阻率测井的影响,利用双侧向求取地层真电阻率Rt,并理论推导了一种直接利用深、中、浅电阻率组合测井资料计算泥浆侵入深度的方法,并根据泥浆污染深度与泥浆侵入深度的关系式,得到储层泥浆污染程度评价定量指标,实现了储层泥浆污染程度的定量评价,分析认为百色盆地田东油田部分那读组储层优质储层产量低主要原因是由于泥浆污染严重造成。
Through the study of the effect of mud invasion on resistivity logging, the true resistivity Rt of the formation is obtained by using two lateral directions, and a method of directly calculating the mud invasion depth by using the combined logging data of deep, medium and shallow resistivity is derived theoretically. According to the relationship between the depth of mud pollution and the depth of mud invasion, the quantitative index of the mud pollution degree of the reservoir is obtained, and the quantitative evaluation of the degree of mud pollution in the reservoir is realized. The analysis shows that some high quality reservoirs of Nandu Formation in Tiandong Oilfield of Baise Basin The main reason for the low output is due to the serious mud pollution.