关键词: 裂缝描述, 裂缝网络模拟, 开发特征, 低渗透砂岩储层, 户部寨气田

Abstract: The core analysis method,rock mechanics experiment,three-dimensional finite element numerical simulation and fracture network simulation were used to investigate the fracture system and altitude,fracture property,fracture development degree and distribution in the tight fractured reservoirs with low permeability in the forth member of Shahejie Formation of Hubuzhai Gas Field in Dongpu Depression.The fractures are mainly in the vertical pattern.Four groups of fractures existed in the reservoirs of Hubuzhai Gas Field were distributed in the inclination angles of 33°,83°,109°and 133°,and mainly centralized in 83°.The fractures in original state are mainly the relative isolated structural fracture systems.The connectivity of the different and the same fracture systems was very poor,and the development degree was very different in each part.The fracture network systems are still difficult to be communicated after fracturing.The production behaviors showed that the reservoir had the dual-medium feature,and the productivities of gas wells in the reservoir were different.The lose heart radius had obvious difference between gas wells.The well arrangement was made across the high part of fault block and the fracture development belt in the gas field was drilled,which makes in a good result of oil production.

Key words: Hubuzhai Gas Field, low-permeability sandstone reservoir, fracture types, fracture network simulation, development property