Research On Reservoir Heterogeneity Of The PuⅠ Formation Of The North Part Of Putaohua Oil Field

Putaohua oil field is characterized by narrow and thin sand reservoir. it turns out that the sand body is narrow and small, and distributes messily, and characters with high mud and calcium, and the physics property of oil bed is more different, the heterogeneity is intensive. Now the water cut reaches 88.52%, the oil field has come into the high stage of development. As the increment of the water cut and the decrease of the yield, the heterogeneity is getting more and more intensive. Based on the question and the contradiction in the development of the oil field. And the information of geology and well logs and was used. And from macroscopy to microscopy, from singleness to integration, the heterogeneity integrative index was acted in the reservoir characterization. And we analyzed heterogeneity from several aspects and combining dynamic and static state, by that I found out that the control effect to the remaining oil of the heterogeneity, predict the remaining oil district, in the end it can provide scientific evidence for the following program of the oil field.From above analysis, we conclude that: (1) Puâ… 6-9 sand beds group is the most heterogeneitic, Puâ… 1-5 sand beds group is more heterogeneitic, Puâ… 10-11 sand beds group is the lowest heterogeneitic. (2)The plane heterogeneity is determined by the sedimentary faces, from the main river channel to the thin sand body between the channel, the heterogeneity is gradually decline.(3)The interlayer heterogeneity of is serious, and I concluded five interlayer heterogeneity model, and point out the degree of the interlayer heterogeneity.(4)By analysis, the interlayer is so steady that it can divide the bed into independent oil and water unit except for some wells, the distribution of the interlayer spread abroad. I divided the interlayer into four different kinds which includes 25 interlayers in all. (5)The interlayer enhanced the heterogeneity of the reservoir, By the analysis of two wells, I concluded that the internal interlayer of the flooded well can prevent the water injection so that it can prolong the age of the well. (6) By use of the integrative index of heterogeneity, it turns out that the bound of the heterogeneity integrative index of area of the remaining oil is mainly between 0.5 to 0.7.(7) The injecting water penetrated the big hole, which resulted in the low efficiency and inefficacy circulation body. I concluded the cause and the behave of the low efficiency and inefficacy circulation body. Based on the heterogeneity, I concluded four kinds of the low efficiency and inefficacy circulation body. I found 10 well groups which has the phenomena of the low efficiency and inefficacy circulation. (8) From the heterogeneity, I took action about remaining oil, and obtained good results.