注蒸汽稠油热采开发区浅层汽窜的微重力勘探方法  

A microgravity method for prospecting shallow steam channeling in thermal recovery zones

作　　者：蔡宁骁 王真理[1,2] 周大胜 王义[1,2] CAI Ningxiao;WANG Zhenli;ZHOU Dasheng;WANG Yi(Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Institutions of Earth Sciences, Chinese Academy of Sciences, Beijing 100029, China;Univers让y of Chinese Academy of Sciences, Beijing 100049, China;Liaohe Oilfield Company, PetroChina, Panjin, Liaoning 124010, China)

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院地球科学研究院,北京100029 [3]中国科学院大学,北京100049 [4]中国石油辽河油田公司,辽宁盘锦124010

出　　处：《石油地球物理勘探》2019年第1期235-242,I0010,共9页Oil Geophysical Prospecting

摘　　要：在注蒸汽稠油热采开发区,油层盖层被破坏或注汽井套管破损等原因会造成浅层汽窜现象,严重时会发生地表漏气。为此,提出了一种微重力勘探方法,采用多尺度曲面拟合法分离重力异常,通过对比分析各个尺度的剩余重力异常,研究浅层汽窜的位置和规模。首先用油藏浅层汽窜正演模型验证方法的可行性和适用性,然后将多尺度曲面拟合异常提取方法运用于辽河油田杜84蒸汽辅助重力泄油(SAGD)开发区的微重力勘探,观察到GG-8井在约40m和80m两个深度存在浅层蒸汽聚集区。伽马测井结果显示,在47m和77m两个深度上探测到浅层蒸汽,与上述计算结果十分接近。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 approximately. This conclusion is proved by the subsequent Gamma logging which suggests that their buried depths were 47m and 77m respectively.

关 键 词：重力勘探 稠油热采 浅层汽窜 位场分离 

分 类 号：P631[天文地球—地质矿产勘探]