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Vinton dome地区位于美国墨西哥湾,发育着大量的盐丘构造,为油气的储藏创造了有利条件.地震勘探结果在盐丘区域存在一定的发散从而难以准确地确定盐丘的准确范围,难以为钻探工作提供可靠的信息.为了获得准确的盐丘形态,现今大多采用重力与地震数据的联合解释.重力梯度异常相对原始重力异常具有更高的分辨率,Bell Geospace公司于2011-2012年在Vinton地区进行了全张量重力测量.本文推导出重力张量异常进行界面正反演的公式,并通过理论模型试验证明了重力与张量异常联合反演可有有效地提高反演结果的准确性.根据先前地震结果利用实测重力张量异常反演获得了Vinton dome地区盐丘界面的变化,此外还利用密度反演方法圈定出盐丘的具体分布,结果显示两种方法所获得的盐丘顶面位置相一致,从而为下一步的钻探工作提供了有力的保障.
The Vinton dome is located in the Gulf of Mexico and has a large number of salt domes that provide favorable conditions for oil and gas reservoirs. The results of the seismic exploration have some divergence in the salt dome region, which makes it difficult to accurately determine the exact range of salt domes. Work to provide reliable information .In order to obtain accurate salt dome morphology, most of the gravity and seismic data are now used to explain the joint.Gravity gradient anomaly relative to the original gravity anomaly with higher resolution, Bell Geospace in 2011-2012 in the Vinton area And the total tensor gravity measurement is carried out.This paper deduces the formula of forward and inverse interface inversion based on the gravity tensor anomaly, and proves that the combined inversion of gravity and tensor anomaly can effectively improve the accuracy of inversion results through theoretical model tests. According to the results of previous earthquakes, the change of salt dome interface in Vinton dome region was obtained by using the anomaly inversion of measured gravity tensor. In addition, the density distribution of salt dome was delineated by density inversion method. The results showed that the top of salt dome Consistent location, which provides a strong guarantee for the next drilling work.