Study On The Quantitative Evaluation Of Water Flooded Layer And The Distribution Of Remaining Oil Of Zhuang-2 Fault Block In Jiangsu Oilfield

Study on the quantitative evaluation of waterflooded layer and the distribution law of remaining oil have been a very important problem which is urgent for resolving. The thesis is focused on the first and second Members of Funing Formation of Zhuang-2 fault block in Jiangsu oilfield. By subdividing and correlating the Sub-layer, establishing the sedimentation model by analysis of microfacies and electrofacies, studying the correlation of four reservoir parameters and making the log processing of more wells and take main factors evaluation of reservoir parameters, The theies takes logging evaluation of reservoir restricted by sedimentation microfacies in this area, reveals the logging difference between clastic reservoir and carbonate reservoir. Based on these studies, this paper takes the quantitative evaluation of waterflooded layer and the distribution law of remaining oil by entropy algorithm, finding out the controlling factors, finally providing criterion for enhancing the oil recovery.Several achievements have been obtained as follows: First, establishing the model of sedimentary microfacies and building their electrofacies models on the first and second Members of Funing Formation of Zhuang-2 fault block. Second, according to different reservoir types, establishing the fine and quantity log interpretation models which respond the objectivity,all these can raise the accuracy of reservoir parameter and coincidence rate of waterflooded layer interpretation. Third, through the log response, log interpretation model and log intepratation accuracy degree, this paper analyses the difference between clastic reservoir and carbonate reservoir. Fourth, achieving the quantitative evaluation of waterflooded layer by entropy algorithm, the evaluation standards and pattern of waterflooding are founded. Fifth, concluding the patterns of the remaining oil on the first and second members of Funing formation, clarifying the influential factor of the distribution of the microcosmic remaining oil from the pore throat composition, rock wettability, implantation pressure, revealling the controlling factors of remaining oil, such as fault, microtectonics, microfacies, anisotropy and net conditions. Sixth, emphasizing the different array mode of microfacies, microtectonics, anisotropy, effective thickness, remaining oil saturation and waterlogging state, calibrating and classifying the producing block, then evolving the quantitative assessment of beneficial block by fuzzy algorithm and make the evalution criterion.Seventh, the study of remaining oil combined with log and geology can give a better direction in reservoir prediction, which may guide oil and water location and flood pattern modification.