区域重力波数域解释及找油效果

根据重力异常的频率随异常地质体埋藏深度而变化的原理,设计了数字滤波器,分离出不同深度的密度界面所产生的重力异常,供计算其埋藏深度。根据上述方法,选用 RT 地区1:20万实测区域重力资料进行试验,得出了如下结果:1.计算出中生界顶板埋深,古生界顶板埋深,沉积基底埋深,中生界厚度和古生界估算厚度;2.将实测布格异常分解为中生界异常、上古生界异常和下古生界异常;3.提取出局部异常。结果与已知资料对比及后来的钻井验证,证明比前人所有的方法有较好的地质效果。

Wavenumber-domain interpretation of areal gravimetric data,and its effect in oil exploration

According to the principle that the frequency of wave spectrum of gravity anomaly varies with the depth of geology body, a digital filter was designed to separate out different gravity anomalies for calculating the depths of different density interfaces.The areal gravimetric data in the scale of 1/200000 in RT area were tested using above method.The following results were obtained:1.the depths of Mesozoic-group top, Palaeozoic-group top and se-dimentary basement,as well as the thickness of Mesozoic group and estimate thickness of Palaeozoic group;2 .Mesozoic-group anomaly,upper Palaeozoic-group anomaly and lower Palaeozoic-group anomal, which were extracted from observed Bouguer anomaly ; 3. local anomaly.The results were compared with known data and tested by drilling.The comparison and test have shown that this method brings better geological effect than previous methods do.