Reservoir Evaluation Of South Of Zhou 51 Well Region In Zhou River

Oilfield Development division layer system is an important aspect of the design is also the basis, is an important way to improve the effectiveness of field development. Week 51 well area located in Zhidan County, Shaanxi Province, the exact location is north to the North to Sunday 46 wells, 118 wells south to the week, 93 weeks of the west Well, East arrived in week 11 wells, the control range of approximately 50km2. Currently, the operations area has oil wells, a total of 129 exploratory wells and other types. 2000 began well for week 51 oil and gas exploration area, to the end of 2009 a total of 129 drilling, where an exploration well, production well 128. The only ground work for long-6. With rocks, reservoir formation thickness of the cover combinations of 1000 ~ 1500 m, with enormous potential for oil and gas development.In this paper, Zhidan week 51 well block for the study, 51 weeks for petrological characteristics of the well block, crack, pore structure and reservoir heterogeneity characteristics. Research is divided in accordance with the unified plan Yanchang Oilfield, compared to the process of preference natural potential curve, natural gamma ray, resistivity and sonic difference gradient curves were analyzed, looking for signs layer levels. According to a feature stratigraphic classification principles and methods and marking layer to logs and oil sands drilling depth data, as reflected by sedimentary cycles combination logging curve shape similarity, take cycle contrast, hierarchical control, considering transverse the principle of change, for week 51 chang 6 reservoir group were compared.Conclusion The program is expected 2013--2014 years to build production period, 2013 Week 51 wellblock well production 1.9t / d, the initial moisture content of 26.6%, with an annual oil 2.85 × 104 t. Is expected to 2027(evaluation period of 15 years), the cumulative oil production 26.84 × 104 t, moisture 72.36%, recovery 1.91 percent, the biggest decreasing rate of 11 percent during the operation, the average decline rate of 7.5%, an average annual production rate 0.12%.