高精度重力测量的实验研究

在高精度重力测量中，发现同一异常体的实测重力异常与牛顿定律计算出的理论异常不相符，实测异常的极值幅值近２倍于计算异常的极值幅。而且，实测重力异常的极值向两翼衰减很快，其梯度带间距与异常体的水平尺度几乎一致。这就为高精度重力法圈定储油构造、生物礁等平面位置提供了前提。在同等重力测量精度下，实测重力异常比计算重力异常提高了近１倍的纵向分辨力，得到油气藏和油气侵染带引起的重力负异常也是完全可能的。据此用５个模型的实测高精度重力数据和按牛顿定律计算出的数据进行对比，完全证实了上述结论。

THE EXPERIMENTAL STUDY OF HIGH-ACCURATE GRAVIMETRIC SURVEY

On high-accurate gravimetric survey,the measured gravity anomaly is found to be different fromthe one calculated by Newton Law'The amplitude of the former is about one time more than that of the latter.Therefore,gradient belt of two sides of the maxima(minima)decreases rapidly'The distance betweentwo side's gradient belts is almost equal to the size of anomaly body in horizontal direction.Hence,there is abase for predicting distribution of oil and gas structure and carbonate reef.Under the condition of the samegravimetric survey precision,real gravity data have one time resolution in vertical direction more than the calculated gravimetric data do.It is possible to get reservoir and belt pentrated from oil and gas.In this paper,real gravity data of five models are compared with the calculated gravity data,the results above are perfectlyconfi rmed.