利用重力资料研究穆格莱德盆地南部新生界分布

Study on distribution of the Cenozoic in southern Muglad Basin according to gravity data

为确定勘探程度较低的穆格莱德盆地南部新生界分布特征,利用布格重力异常资料,选取既能利用已有地质研究成果约束,又能大体控制研究区主要构造格局的4条重力异常剖面进行拟合反演。在对重力异常进行定量与定性解释的基础上,应用SPSS中的相关分析(Pearson相关系数)与回归分析(曲线估计)原理,计算出了研究区的新生界底界埋深。结果表明:研究区新生界在隆起区相对不发育,而在凹陷区厚度较大,平均厚度超过2 200 m。认为新生界厚度较大的穆格莱德盆地南部凹陷区是进一步油气勘探的有利区。

In order to understand the distribution features of the Cenozoic in southern Muglad Basin,4 profiles of gravity anomaly which both are covered with existing geological data and can generally control the main tectonic framework in the study area are used for fitting inversion. Based on the quantitative and qualitative interpretation of gravity anomaly,the buried depth of the Cenozoic bottom in the study area is calculated using the correlation analysis in the SPSS and regression analysis. It is shown that the Cenozoic is relatively less developed in the uplift zone,but the thickness of the Cenozoic is greater in depression zone,the average thickness is more than 2200 m. So it is held that the depression zone of greater Cenozoic thickness in southern Muglad Basin is favourable oil and gas exploration area.