关键词: 薄层超稠油, 驱泄复合, 蒸汽腔演变, 物理模拟实验, 齐古组, 侏罗系, 风城油田

Abstract: The 2D and 3D physical simulation experiments and numerical simulation studies were carried out on the reservoirs of Jurassic Qigu Formation in F well area of Fengcheng oilfield，Xinjiang，revealing the evolution law and production mechanism in the compound development of steam chamber. The results show that：（1）Under the action of steam overlay and pressure relief traction at the recovery point，the main body of the leading edge of the steam chamber advanced to the horizontal section，and the shape of the leading edge of the steam chamber evolved from “spout” type to “bell” type，and finally became “cap” type. The three-dimensional shape of the steam chamber first presented an “isolated island” type around the vertical well，then connected into a “corridor bridge” type，and finally converged into a large cavity.（2）According to the evolution law of steam chamber， the whole simulation experiment process was divided into injection-production connection stage，steam chamber formation stage，steam chamber lateral expansion stage and steam chamber decline stage. The recovery rate of the whole production cycle can reach 55.6%，the oil-steam ratio is 0.17，and good experimental results have been obtained.（3）The physical simulation experiment and numerical simulation results reveal the oil displacement mechanism of steam displacement in the early stage and gravity drainage in the middle and later stage of compound development，characterizing the evolution law of steam chamber，which provide technical support for the efficient development of similar reservoirs.

Key words: thin-layer ultra-heavy oil, flooding and drainage, steam chamber evolution, physical simulation experiment, Qigu Formation, Jurassic, Fengcheng oilfield