Abstract：Studying the palaeotopographic feature and rule of structural evolution in an area is the precondition and foundation to look for and analyze various fans and deltas. Different in internal structure of fan with surrounding beds, there is difference in lithology and dips with surrounding beds, which becomes possible that utilizes seismic attributes to analyze the internal structure, configuration and development size of fan. The feature analysis of horizontal seismic attribute is an effective tool to determine the development size of fan and describe spatial distributing feature of fan. The Qigequan area is situated in the margin of Qaidam basin, where developing the lithologic and stratigraphic erosion pinchouts; and at the same time, affected by Alar source area and Arjin piedmont steep-slope near source area, developing various different types of sedimentary bodies in different geologic epochs, including alluvial fan, near-shore underwater fan, fan delta, turbidite fan and braided river fan, which is one of the most prospective areas for looking for various lithologic (stratigraphic) traps in Qaidam basin. The discovery of underwater fan in Q32 well started firstly from studying palaeotopographic and palaeotectonic feature in E31 and E32 epochs, used such technical tools as seismic attributes and horizontal slices to describe and demonstrate the internal structure, configuration and distribution range of discovered sedimentary bodies that are finally proved by drilling results, which provided meaningful reference for following development of study on (lithologic) stratigraphic traps.
陈海清, 杨波, 王光华, 何丽红, 冯广占. 柴达木盆地七个泉地区Q32井水下扇分析[J]. 石油地球物理勘探, 2007, 42(4): 429-434.
Chen Hai-qing, Yang Bo, Wang Guang-hua, He Li-hong, Feng Guang-zhan. Analysis of underwater fan in Q-32 well of Qigequan area, Qaidam basin. OGP, 2007, 42(4): 429-434.
