摘要
Z油田在钻井过程中根据井况不同,采用淡水和盐水2种不同性质泥浆钻井,致使部分盐水泥浆钻井的油层段电阻率低于相邻井淡水泥浆钻井的水层的电阻率,双侧向电阻率无法正常地反映地层流体特征,饱和度参数计算的精度不够。在分析Z油田低阻碳酸盐岩储集层特征的基础上,通过分析岩石物理模型,建立了电阻率等效校正模型,结合泥浆电阻率曲线和常规测井曲线,对Z油田多口井进行了深侧向电阻率侵入校正。通过对不同井淡水和盐水泥浆侵入校正后,还原了深侧向电阻率对区块地层流体的响应,实现双侧向电阻率准确识别地层流体和饱和度参数定量评价的目标。
Fresh mud and saline mud were used for drilling different wells in the Z oilfield. The results were that the resistivity of part of the reservoir interval drilled by saline mud was lower than that of aquifer in adjacent wells drilled by fresh mud; dual laterolog resistivity can not reflect formation fluid characteristics as usual; and the accuracy of saturation calculation is not precise enough. Based on the characteristics of the low resistivity carbonate reservoirs,an equivalent correction model of resistivity was built up through analyzing petrophysical model; and invasion correction was conducted for LLD resistivity in many wells in the Z oilfield in conjunction with mud resistivity curve and conventional logs. After correction of fresh and saline mud invasion in different wells,the response of formation fluid to LLD resistivity was restored,thereby formation fluid was identified accurately and saturation was evaluated quantitatively.
出处
《特种油气藏》
CAS
CSCD
北大核心
2013年第5期28-31,152,共4页
Special Oil & Gas Reservoirs
基金
"十二五"国家重大专项"中东中亚富油气区大型项目勘探开发关键技术"(2011ZX05031-002-006HZ)
关键词
低阻油层
储层建模
泥浆侵入
环境校正
中东Z油田
low resistivity reservoir
reservoir modeling
mud invasion
environmental correction
Z oilfield in Middle East
