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根据重力模型研究沉积深盆地基底构形,引入密度随深度指数增加的函数可以改善其精确度。为了用这样的指数型密度—深度关系计算三维(3—D)构造的重力效应,提出了以级数展开为基础的频域正演算法。可用快速富里叶变换高效率地完成其中的数值计算。从而提供有关基底起伏的反演结果。该算法可在循环的计算过程中应用。就重力资料的2—D合成例子和奥地利东部潘诺尼亚盆地西部边缘3—D实测例子对反演算法进行了试验,并取得了令人满意的结果。这里第三系沉积岩厚达2.2km,上伏在火成岩或变质岩基底之上。几口钻穿基岩面的井证实了反演的结果。
Based on the gravity model, the basal configuration of deep sedimentary basins is studied, and the introduction of density as a function of depth index can improve its accuracy. In order to calculate the gravitational effects of three-dimensional (3-D) structures using such exponential density-depth relationships, a forward-frequency domain algorithm based on series expansion is proposed. The fast Fourier transform can be used to efficiently perform numerical calculations. Thus providing the inversion of the basement fluctuations. The algorithm can be used in the calculation of the loop. The inversion algorithm was tested on the 2-D synthesis of gravity data and the 3-D real-world example of the western edge of Pannonia basin in eastern Austria, and the satisfactory results were obtained. The Tertiary Sedimentary Rock here is 2.2 km thick, and it is on top of igneous or metamorphic rocks. A few wells drilled through the bedrock surface confirmed the result of the inversion.