Abstract

Info

Title:: Description Method and Assemble Patterns of Single Fan from Fan Delta—A Case Study of Xing’anling Reservoir, Sude’erte Oilfield, Bei’er Depression, China

Author(s):: XIAO Da-kun; LIN Cheng-yan; MA Li-min; REN Li-hua; 1. CNOOC Research Institute Co. Ltd., Beijing 100028, China; 2. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China; 3. Research Institute of Petroleum Exploration and Development, Jidong Oilfield Company, PetroChina, Tangshan 063004, Hebei, China

Keywords:: fan delta; assemble pattern; reservoir architecture; high-resolution; reservoir correlation; seismic attribute; Xing’anling reservoir; Bei’er depression

Abstract:: Based on the previous study of fan delta reservoir architecture, taking Xing’anling reservoir of Sude’erte oilfield in Bei’er depression, China as example, the architecture description method and fan body assemble patterns of single fan in fan delta were discussed. Single fan architecture description of fan delta should be achieved in 3 dimensions, including point, line and plane. Firstly, corresponding relation between single fan and high-resolution sequence units is built to clarify the vertical scale through single well analysis; secondly, well correlation for fans is made to build proper sequence stratigraphic skeleton, and the main and margin portion of fans are identified by recognizing lateral variations of deposition cycle; finally, fan boundary is described by seismic attributes. Single fan fine description of fan delta in Xing’anling reservoir of Sude’erte oilfield was carried out, and 3 assemble patterns for single fan bodies were summarized, namely, isolated, superimposed and contact fans. Isolated fans can be subdivided into isolated fans with same supply channels and with different supply channels; according to the differences of superimposed orientation, the superimposed fans can be subdivided into vertically and laterally superimposed fans; according to the levels of fans, the contact fans can be subdivided into different-level and same-level contact fans.