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对西西伯利亚油气藏附近重磁场特性的研究表明,重磁场与油气藏存在某种空间关系。与西西伯利亚北部相关的重磁异常大约覆盖900000km~2。首先借助二维傅里叶频谱(DFS)分析对振幅和频率进行研究。其后的工作为:(1)进行变换、滤波和“移动窗口”分析;(2)编制区域和局部异常图及位场导数图;(3)研究已知油气藏区域的参数分布。油气藏大部分位于区域重磁正异常的斜坡上,该异常被解释为与深部裂谷型构造相关。同时还证实了油气藏的位置通常与局部重磁极小值是一致的,而这些极小值是由于基底为低密度和低磁化强度所引起。西西伯利亚北部的所有已知油气藏均位于波长大约90km-100km且梯度较大的重力异常区内。这种新揭示的油气藏与位场参数之间的关系在勘探程度低的陆地和海洋(主要指俄罗斯的北极大陆架)可用干预测新的油气藏。
The study on the characteristics of heavy and magnetic fields near West Siberian reservoirs shows that there is some spatial relationship between heavy and magnetic fields and oil and gas reservoirs. The gravity and magnetic anomalies associated with the western part of western Siberia cover about 900000km ~ 2. The amplitude and frequency are first studied using two-dimensional Fourier-transform (DFS) analysis. Subsequent work: (1) transform, filter and “moving window ” analysis; (2) preparation of regional and local anomaly maps and bit field derivative maps; (3) study of the known oil and gas reservoir area parameter distribution. Most of the oil and gas reservoirs are located on the slope of the regional gravity-magnetic anomaly, and this anomaly is interpreted as being related to the deep rift-type structure. At the same time, it is also confirmed that the location of the reservoir is generally consistent with the local gravity-magnetic minimum, which is caused by the low and low magnetization of the substrate. All of the known oil and gas reservoirs in the northern part of Western Siberia are located in a gravitational anomalous zone with a wavelength of about 90km-100km and a large gradient. The relationship between this newly discovered oil and gas reservoir and site parameters can be used to interrogate new reservoirs on less-explored land and sea (mainly Russia’s Arctic continental shelf).