SEDIMENTARY ARCHITECTURAL ELEMENTS OF UPPER MEMBER OF THE GUANTAO FORMATION IN GUDAO AREA, SHENGLI OILFIELD
Li Yang1, Li Shuangying2, Yue Shucang2, Wang Zhongcheng3, Li Zhong3, Wu Chaodong4, Li Xiang3
1. Shengli Petroleum Administration, Dongying, Shandong 257001; 2. Department of Natural Resources and Environmental Sciences, Hefei University of Technology, Hefei 23000; 3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029; 4. Department of Geology, Peking University, Beijing 1000871
Architectural element analysis advanced by Miall, as a relative common method, has been extensively applied on studying ancient fluvial deposits in the world. Based on the drill data, this paper studied, firstly, the architectural elements of fluvial deposits of the 5～1+2 sandstones in the Upper Members of Guantao Formation (UMGF) in the Gudao area, Shengli Oilfeild. There are 11 kinds of petrofacies in the 5～1+2 sandstones of the UMGF, with simple rock association. On the basis of bounding surface features, petrofacies assemblage, internal geometry, external form and vertical profile, etc., the sandstones can be divided into 6 architectural elements, namely, the channel lag (CHL), the lateral accretion macroform (LA), the levee (LV), the crevasse splay (CS), the crevasse channel (CR) and the floodplain fines (FF), in which the architectural elements of FF, CS and LA develop extensively, the LV and CS occur subordinately, and the CHL develops poorly. The crevasse splay element is one of architectural elements which, as a main unit of sand bodies in the UMGF, contains rich oil and gas. It is necessary to make more study on the element of crevasse splay for exploration of oil and natural gas.