A microgravity method for prospecting shallow steam channeling in thermal recovery zones
CAI Ningxiao1,2,3, WANG Zhenli1,2, ZHOU Dasheng4, WANG Yi1,2
1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. Institutions of Earth Sciences, Chinese Academy of Sciences, Beijing 1000 29, China; 3. University of Chinese Academy of Sciences, Beijing 1000 49, China; 4. Liaohe Oilfield Company, PetroChina, Panjin, Liaoning 124010, China
Abstract：In heavy oil thermal recovery zones,the shallow steam channeling would occur due to the damages of reservoir cap rocks or injection well casing.This phenomenon can cause many problems such as production cost increase and environmental pollution.This paper proposes a new microgravity method,which traces steam chambers in shallow layers based on multi-scale anomaly extraction and analysis.The proposed method is tested by a simulation model before applied to the steam assisted gravity drainage (SAGD) zone,Du 84,Liaohe Oilfield,China.It is concluded that there are two steam chambers in shallow layers near observation well GG-8,and the buried depth of these two chambers is respectively 40m and 80m approxi-mately.This conclusion is proved by the subsequent Gamma logging which suggests that their buried depths were 47m and 77m respectively.
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