摘要
石南21井区中侏罗统头屯河组油藏水淹受储集层沉积韵律性影响大,正韵律区域底部水淹强,中上部水淹弱;反韵律区域整体水淹较强。采用层间渗透率比值法确定划分储集层韵律的临界值,从而查明了油藏正韵律分布区;通过建立预测弱水淹油层厚度模型,进一步优化井位,降低加密风险。所提出的储集层沉积韵律特征表征方法和弱水淹油层预测方法可操作性强,经新完钻调整井验证符合程度高,可推广至其他块状低渗砂岩油藏。
The water-flooded rules in Toutunhe reservoir of Shinan-21 well block in Junggar basin are greatly influenced by reservoirrhythm.The bottom of positive rhythm zone is heavily water-flooded,the middle-upper part is weakly water-flooded,while the reverserhythm area is overall heavily water-flooded.In order to find the reservoir area of positive rhythm with less water-flooded risk,the method ofinterlayer permeability ratio was adopted to confirm the critical value for reservoir rhythm classification,so that determine the positive-rhythm reservoir distribution area.Also,the model for prediction of the weakly water-flooded reservoir thickness was developed to furtheroptimize the well locations and reduce the risk of adjustment.The methods for characterization of reservoir rhythm and prediction of weaklywater-flooded reservoir thickness are of high probability and good agreement with the new adjustment wells,and can be applied to othermassive sandstone reservoirs with low permeability.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2015年第3期288-292,共5页
Xinjiang Petroleum Geology
