朝阳沟油田荧光显微图像资料应用方法研究

Study on the application method of fluorescence micro image data for Chaoyanggou Oilfield

大庆外围朝阳沟油田属低渗透岩性-构造油藏,由于受岩性、沉积微相、微构造及断层等因素的控制,存在多套油水组合,注水开发后水淹层解释符合率较低。通过开展低渗透油层模拟注水驱油实验,在一定温度和压力下测定油、水相对渗透率,制备饱含油及低、中、高含水率的岩样,对岩样进行荧光显微图像分析,研究了低渗透油层水洗后荧光显微图像资料的判断依据。结合已投产井资料总结了朝阳沟油田低渗透油层不同水洗程度的荧光显微图像特征,建立了该区微裂隙的识别方法及水洗油层与原始油水同层的区别方法,在朝阳沟油田47口加密调整井应用中,其综合解释符合率为83.2%。

Chaoyanggou Oilfield at the outside of Daqing Oilfield belongs to low permeability lithologic-structural reservoir,in which multi sets of water combination exists as it is subjected to the control of lithology,sedimentary microfacies,micro structures and faults etc.The interpretation coincidence ratio for water flooded zones is fairly low after water injection development.By carrying out the low permeability stimulation experiment of oil displacement through water injection,during which the relative permeability of oil and water is detected under certain temperature and pressure,the rock samples with filled oil and samples with low,middle,high water cut are prepared and analyzed with the fluorescence micro image to study the judging basis of fluorescence micro image information of the low permeability oil zones after water washing.Combining with data obtained from production wells,the author summarizes the features of the fluorescence micro images for different water washing degrees of low permeability oil zones in Chaoyanggou Oilfield,sets up the distinguishing method of micro fractures in the area and makes a distinction method between water washing oil zone and original oil and water zone.The composite interpretation coincidence ratio is 83.2% in the application of 47 infill wells in Chaoyanggou Oilfield.