综合地球物理方法对南海西北部-印支半岛地区中生界分布的研究

南海西北部是我国海洋油气的重要基地.为了研究该区前新生代尤其是中生代油气资源潜力,本文以岩石物性的差异为基础,建立地质界面与物性界面的联系,利用综合地球物理方法来分析目标物性界面的分布特征.在地震资料控制浅层沉积结构的约束下,根据重力资料,通过小波分析位场剥离等方法得到剩余场,由Parker界面反演法反演计算了研究区的重力基底,结合新生代沉积分布得出中生界分布特征并给出了中生代残留盆地的可能分布范围,为分析研究区中生代油气资源潜力提供参考.

A study on distribution of Mesozoic strata in Northwestern South China Sea and Indo-China Peninsula using integrated geophysical methods

In order to assess the oil and gas resource potential of Pre-Cenozoic especially Mesozoic in the Northwestern South China Sea, macro-distribution of Mesozoic strata is studied by using integrated geophysical methods. Based on rock physics properties, the relationship between geological interfaces and physical property interfaces is built, and the distribution of interfaces can be obtained based on different geophysics data. The shallow sedimentary basin structure can be obtained from reflection seismic data; and basement undulation and deep structure can be obtained from gravity and magnetic inversion. The regional-residual potential field is separated by forward computation, filter operation and wavelet analysis. Basement undulation is inversed from corresponding anomalies using the Parker-Oldenburg method. Finally, macro-distribution of Mesozoic strata is determined in combination with real geological data.