Study On Geologic Characteristics And Development Result Of Waterflooding Of Sanjianfang Formation In West Ling-er Area In Qiuling Oil Field

Based on careful division and correlation of substrata of Sanjianfang formation in west Ling-er area in Qiuling oil field, This study confirmed the distributing of the faults in study area,carefully researched the relation among the distributing of the sand body, the distributing of the physical properties and sedimentary microfacies, made quantitative analysis about the reservoir macroscopic heterogeneity, put forward an uniform evaluation standard of substrata; This study analysed the factor which causes the changing of the production, expounded the development result of waterflooding of Sanjianfang formation in the west Ling-er area through the ways that the oil(water)-occurrence in the oil well, the balance between waterflooding and exploitation and the reservoir exploited; Summed up the characteristics of the movment of the inject water and the rule of the distributing of the remaining oil.Based on the fruit of the bypast research, through particular analysis and study, the following knowledge has been obtained:1. The Sanjianfang formation's oil reservoir can be divided into 39 substrata on sedimentary cycle and sedimentary rhythmic character of reservoir. And two new fault among the wells is confirmed through the division of substrata and the dynamic test.2. The change of the substrata's thickness is great, and the distributing area of the substrata in plane is small. The distributing of the substrata with good connection(S13, S23-1, S23-2, S23-3, S24-1, S24-2, S42-2 etc.) is stabilization.3. The change of the substrata's physical properties is great, and upperreservoirs' physical properties is better than underreservoirs'. The number of the substrata with better physical properties in S2 and S4 is more than that of S,, S3 and S5 And the substrata with great thickness and better physical properties is mainly lie in the middle or bottom of every strata.4. The heterogeneity of S2and S4 is intenser than S,, S3 and S5 And the heterogeneity of S,3, S22'1, S23'2, S24'1, S24'2, S42'2 is relatively weak.5. The distributing of the reservoirs is mainly controlled by the sedimentary microfacies of braided channel and underwater braided channel.6. High injection production ratio is the important reason which reflect the droping of the oil production. All the while, the reservoir pressure of the west Linger area is under the saturation when production. Keep the injection production ratio around 1.1 is propitious to resume the reservoir pressure.7. Fault and sedimentary facies are the main factors that effect on the waterflooding development and the time of water-occurrence.8. Horizontally, the exploited degree of the sand body in main channel is better thanother microfacies. Vertically, the exploited degree of the upperreservoir is better than underreservoirs, and downside is better than upside in one reservoir. 9. The direction of the sand body distributing, the sedimentary environment, the physical properties of the sand body and the incised action that the fault bring to sand body lying its two sides, are the main factors that effect on the rule of the movement of the oil and water lie in same substrata. Vertically, the remaining oil in the S1 is more concentrated than other reservoir. Horizontally, the remaining oil in the flood plain deposit and in the area controlled by fault is more concentrated than other area.