【摘要】 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.更多还原

【Abstract】 Vinton dome is located at the Gulf of Mexico USA,and develop many dome structures,and create an advantage for gas reserve.Seismic prospecting is hard to ascertain the location of the dome correctly because the seismic wave is diverging,so this method is hard to provide reliable result for drilling.In order to obtain the shape of the dome correctly,we usually used the integrated inversion of gravity and seismic data.Gravity gradient data have higher resolution compared to original gravity data,and Bell Geospace had measured the full tensor gravity data from 2011 to 2012.We derive the relationship between the gravity tensor data and surface,and we proved that the integrated inversion of gravity and tensor data can effectively improve the accuracy of inversion results.Depending on the previous seismic results we obtain the surface of dome using the measured gravity tensor data.Moreover,we also use density inversion to delineate the location of dome,and the results show that the locations obtained by two methods of the dome are consistent,and can provide effective guarantee for next drilling work.更多还原