Study Of Reservoir Development Geology Of The Putaohua Oil Layer In Fang 169 Block, Daqing

Fang 169 block in Zhaozhou oilfield is part of the Zhaozhou nose structure located in the south of Sanzhao depression of the Songliao Basin. Putaohua oil layer is the main producing position at Yaojia formation one member of Lower Crataceous (K1y1), which is a set of deposit of delta front , outside delta front under the control of East Daqing placanticline water system.Based on the predecessors'related results for Fang 169 block and surrounding, through comprehensively using data of geology, well logging, producing test and exploitation, the author does the following work in turn. By summarizing the reservoir characteristic of Putaohua oil layer at Fang 169 block; dividing microfacies and analyzing its characteristic of plane distribution, Pu I oil layer is subdivided from bottom to top into 3 types: lacustrine regression, stability and lacustrine transgression outside delta front; According to analysis on produced fluid situation and well log of the typical well, it is obtained that two types of produced fluid of the single well and the multi-layer, include their electric property; With exploitation data, the oil wells in the area are divided into the high, middle and low produce wells, whose effect factors and controlled conditions of oil/gas enrichment are discussed in some aspects include the characteristic of production curve and producing payer's bore log, the statistics on physical parameters of various sublayers of sand body, plane distribution of the microfacies, vertically various sublayers'comparison diagram of well tie and so on; Combining the quanti??ve calculation and the exploiting demonstration, to analysis response to waterflood, controlling factors of the well connectivity, minor faults seeling, the type and controlling factor of oil/water distribution, type of reservoir and so on, then by classified evaluation for oil-gas potential of the partial area, to screen the advantageous enrichment area and beneficial well construction area.The following main understandings are obtained through carrying out the above researches:First, the study area is dominated by mouth bars'the end to the lake– distal bar , front sand sheet and front shaly microfacies in the area. According to analysis on characteristic of the high capacity well distribution, indicates that distal bar's sand body widely connectedly distributed with good physical property of reservoir and high degree of hydrocarbon enrichment, is the advantageous region distributed the high capacity well.Second, the key factors controlling oil/water distribution are structural location and physical capacity of reservoir. In the whole, it is adopted to the model of oil/water distribution: the high portion of the structure is oil, the low portion is water; oil/water distribution between the neighborhood layers or wells in the small is mainly controlled by physical capacity of reservoir, oil saturation is high in the layers with good physical property of reservoir, oil saturation is low in the layers with bad physical property of reservoir.Third, fault has the obvious fluid closeness in the producing process in study area. The study about flood development demonstrates that injection/production wells is without the fluid connected relation at two side of the fault. Wherefore the shape and the size of fault blocks should be considered at disposition of the development well pattern.Fourth, the geology conceptual model is proposed about abnormal well producing water which is adopted to geological condition of this region. the analysis indicates the underground water body space is limited, and it is impossible to widely exist e??or bottom water affecting the entire district production.Finally, at undeveloped subarea of Fang 169 block, we should preferentially choose favorable ones with multi-layers and widely connectedly distribution . Regarding subarea cut by the fault, the oil well should be deployed in the high portion according to the fault block the shape. If the fault block is big, injection well is in the relatively low portion; If the fault block is small, intermittent injection/production at single well is choosed to save the cost.