| Wangjiawan field lies in the east part of Shanbei slope of erdos basin. The main development reservoir,chang21, is the typical low porosity and low permeability reservoir, and water injection development has been applied to reservoir since2005. The poor effect of water injection and low degree of comprehensive development are main problems.Though the study in the core, logging information of chang21, the characteristics of structure, stratum, sedimentary, physical properties and reservoir is fully and comprehensively described and water injection and other development methods can be more effective and reasonable. The conclusions are as presented as followed.1. The structure in WJW is simple without evidently developing faults, but a series of nose structure can be seen in region.2. Chang21can be divided into three sub-layers, chang211ã€chang212ã€chang213.The thickness of stratum is steady with good inheritance3.the sedimentary facie is delta plain sub-facie which mainly developed underwater distributary channel nature bay and distributary inter-channel bay. Compared with chang21and chang212, chang213has the best physical properties.4. The major rock type of the reservoir is mainly feldspar sandstone, and the low porosity and permeability lead to poor physical properties. Compared with chang21and chang22, chang23has the best physical properties.5. Wangjiawang field is affected by structure, lithology, cap rock, sedimentary facie, reservoir and transportation. Based on the standard of field development and Hierarchical naming principle by Qiuyinan, Wangjiawan can be divided as anticlinal porosity bottom-water-layered sandstone field and monoclinic porosity boundary-water-layered lenticular sandstone field.Reservoir basically spreads along the distributary channel and chang213reservoir is wildly spread than chang212reservoir, but both with large thickness. Chang211reservoir is only distributed in some well section with small thickness.In general,Wangjiawan filed has a promising development potential,and if development can be implemented based on the fundamentally geological data, the economical effect of wangjiawan will be enhanced. |
