乌南油田N₂¹油藏储层“四性”关系研究

4-property relationship study on N2
1 reservoir in Wunan Oilfield

赵为永 陈宏民 李松东 梁虎 邓生青

1． 青海油田公司勘探开发研究院，甘肃 敦煌 736202 2． 中国石油集团测井有限公司青海事业部，甘肃 敦煌 736202

乌南油田N₂¹油藏储层主要为三角洲相沉积，储层岩性以粉砂岩和细砂岩为主。储层岩相、岩性、物性的差异控制了油藏的富集程度,在岩性、岩相相同的情况下,含油性取决于物性的好坏。通过对测井、测试、岩心分析化验及水分析资料等的整理及储层“四性”关系研究,建立了测井资料参数处理解释模型,确定了N₂¹油藏油气水层解释标准,提高了解释符合率,对相邻区块的测井解释也有指导意义。

N₂¹ reservoir of Wunan Oilfield is of mainly delta front subfacies. The lithology consists mainly of siltstone and fine sandstones.
The difference between lithofacies, lithology and physical property of the reservoirs govern the oil and gas accumulation level. Under
the same lithology and lithofacies conditions, the oil-bearing saturation depends on the difference of physical property. With the
analysis of the logging data, the production testing data, the core data, the water analysis data as well as the study of 4-property
(lithology, electrical property, petro-physical property and oil-bearing property) relations of the N₂¹ reservoir, the model of well log-ging data processing and interpretation has been established and the well logging interpretation standard has been determined. The
coincidence rate of the oil gas-bearing formations has been also increased. The results of the study have important guiding signifi-cance for the well logging interpretation of adjacent structures.