Reservoir architecture of the shore-shallow lake sand body and its implication in Wunan oilfield
Shi Jinhua1,2，Han Denglin3,4，Yu Bingsong1，Li Shiyuan2，Wang Bao2，Chen Jinghua2
1. School of Earth Sciences and Resource，China University of Geosciences，Beijing 100083；2. Petrochina Qinghai Oilfield Company，Dunhuang，Gansu 736202；3. Key Laboratory of Exploration Technologies for Oil and Gas Resources of the Ministry of Education，Yangtze University，Wuhan 430100；4. College of Geosciences，Yangtze University，Wuhan 430100
Based on the Miall reservoir architecture theory，and through core，logging，testing data，characteristics of reservoir conformation boundaries of beach-bar sandstone bodies in Wunan oilfield were well analyzed，and reservoir architecture interface identification was determined. Inner architecture of sand bar can be divided into sand bar body and sand bar margin. Meanwhile，combining static and dynamic analysis，outer architecture of sand bar can be classified into four modes，such as isolated mode，apparent connected mode，left superimposed mode and right superimposed mode. In the longitudinal direction，two kinds of sand distribution patterns were well developed，like progradation pattern and retrogradation patteren. Sand bar body is main reservoirs of this area，and has good oil and gas shows. Large distribution and high frequency of sand bar body are favorable for oil and gas exploration and development.