The Studied Of Reservoir Character Of Thick Fluvial Sand Body

In this paper, we studied the reservoir character of PI formation in south first-second region, north of Saertu. We based on the analyse to main drill core of the area and adjacent, Start with area stratum, set up microfacies type and identify characters of the area, make certain the types of facies and microfacies, and establish the mode of well logging microfacies. Through synthetical contrast and analyze the layers and sand body of in PI formation of 316 wells, using well logging curves to partition and get 8 layers: PI1-PI7, in them P12 is thick formation, can be divided into P12a and P12b layers. PI formation is combination of thick sand body, because the sediment mode of reservoir in ChangYuan of Daqing is mainly combined of great leaf delta and partly fluvial facies, about 500m thick, combined of 130 little sand or mud layers, which is typical heterogeneity reservoir, the reservoir's character is greatly distribute, high permeate and serious heterogeneity. In this paper, we detailed described the character of stratum, sediment microfacies and reservoir, then studied the heterogeneity of reservoir from aspect of in layers, between layers and plane, discuss the influence of various facts, then evaluate the heterogeneity of reservoir. In this paper, we emphasis P11-P13 layers, which is high meander channel, low meander channel and braided stream deposit. To braided stream deposit, the fluvial sand body is distribute largely and continuously, so the heterogeneity is poor relatively, the relation of injection and production is better in the case of rare wells, about all wells have come on water, only in some thin sandbodys or bad physical layers there is some low flooded strata. To meander channel, because the channel continuously moved, form duplicate fluvial sand bodies largely, and there are many area of non sandbodies or in fluvial sandbodies, there are some abandoned channel, all make the continuous of sandbodies poor upper the meander channel sandbodies, so remained oil is mainly distributed in sandbodies in fluvial channel, abandoned channel and non sandbodies area nearby.