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近几年,有偏垂直地震剖面(0VSP)勘探作为一种很有价值的油田开发工具,已得到越来越多的应用.但它仍然主要是应用于检测地面地震资料所无法确定的小断层和构选细节.本文展示了一个 OVSP 观测结果,其主要目的是恢复与灰岩孔隙率有关的反射真振幅.该项观测是1987年在印度尼西亚南 Sumatra 地区的 Jene 油田上进行的.Jene 的储层是在中新世形成的Baturaja 灰岩层中的礁体建造,且随接近礁体顶端,孔隙率降低,从地层学角度上讲,可捕获到油气.OVSP 资料是用单个气枪震源和井中三分量检波器记录的.利用这个资料,对纵波和转换横波都作了处理.从分辨率较高的 OVSP 资料中,发现在 Baturaja 灰岩的反射区有一个振幅减小的异常,将这个异常与地面地震资料的精细处理结果相结合,可推断此异常为一个小礁体,它位于 Jene 油田附近.我们认为,它很可能是一个含油礁体.
In recent years, partial vertical seismic profile (0VSP) exploration has gained more and more applications as a valuable oilfield development tool, but it is still mainly applied to the detection of small faults whose surface seismic data can not be determined And the details of the selection.This paper presents an OVSP observation with the main purpose of recovering the true reflection amplitude associated with the porosity of the limestone in the Jene field in southern Sumatra region of Indonesia in 1987. Jene’s deposit The layers are reef-built in the Miocene Baturaja limestone layer, and the porosity decreases with the approach of the top of the reef, which captures oil and gas from a stratigraphy point of view. The OVSP data is obtained using a single airgun source and well- Using this data, both the P-wave and the converted-shear wave were processed.From the higher-resolution OVSP data, it was found that there was an anomalous amplitude anomaly in the reflection region of the Baturaja limestone. This anomaly was correlated with Combined with the fine processing of ground-based seismic data, it can be inferred that the anomaly is a small reef that is located near the Jene field, which we think is likely to be an oil-bearing reef.