Research On Evaluation Method Of Post-saturation Saturation Logging Of Water-flooded Layer In Yuejin No.2 Oilfield

Yuejin-2 oil field is complicated by faults of the anticlinal structural reservoir. This paper mainly studies the objective layers for the Xiayoushashan Group (N21) and Shangganchaigou Group (N1), which are two reservoirs. Through the analysis of the production data of oil field, we know that the two sets of reservoir in this study are in the middle and high water cut stage, the water flooding degree is high, the water level driving is low, and the remaining oil is highly dispersed. And the distribution of the fault is complex, which result in a thin, multiple, scattered, miscellaneous reservoir, combined with the influence of water injection and side water effect in the development process, the remaining oil distribution is more complex and difficult to accurately identify water flooded layer. Currently, the oil field is facing the critical moment of a rise in high water cut stage and stable yield, water flooded layer identification and potential layer excavation work are imminent. According to the current form, we urgently need to find some methods to evaluate the casing saturation logging evaluation method of water flooded layer rapidly and accurately.Based on the casing wellbore saturation logging technology currently, combined with saturation logging measures results and fluid production profile and other dynamic monitoring data of Yuejin-2 oilfield in recent years, the evaluation method of water flooded layer was studied. The interpretation method of water flooded layer is studied by qualitative identification and quantitative classification.First of all, the qualitative identification of water flooded layer is mainly divided into two parts, the identification of open hole and the recognition of casing well; and then the quantitative division of water flooding level, which include the use of flooding efficiency and water yield to divide the flooded level, and focus on the introduction and use of the macro-capture cross section in the Pulse Neutron Neutron logging (PNN) for flood level flooded layer quantitatively division.Finally, in this thesis, the distribution of water flooded layer on plane and profile is studied, the potential Yuejin-2 Oilfield exploration site are analyzed, flooded blocks and small layers are identified and the coincidence rate of water flooded layer interpretation is improved through the explain of the interpret data and production data of the single well and combined with the geological structure characteristics, which provide the basis for the fine description of reservoir and the adjustment of the later development plan.