Abstract:The Anda area is located in the Xujiaweizi fault depression, and there are two large erupting periods (yc32 and yc33) in volcanic edifices in the third member of Yingcheng Formation, each consisting of multiple secondary erupting periods. Because volcanic edifices are characterized by a large burial depth, high concealment, special provenance, variable formation mechanisms, and fast lithofacies change, their internal structures are complex. The conventional seismic data in the Anda area have low vertical resolution and amplitude fidelity, and thus the stratigraphic distribution in each erupting period is hard to be accurately identified and depicted. Therefore, based on high-density seismic data, near-surface compensation and pre-stack time migration with stationary phases in the viscoelastic medium are used to greatly improve the vertical resolution and amplitude fidelity of the imaging results. Seismic interpretation techniques such as coherence analysis, layer flattening, and fine waveform comparison are applied to finely describing superimposed volcanic edifices. Well logging and seismic data are combined to accurately divide the erupting periods of volcanic edifices. To be specific, yc32 is divided into three periods (yc32-1, yc32-2, and yc32-3) and yc33 into two periods (yc33-1 and yc33-2). Finally, the following results are obtained:① Acidic rocks, dominated by volcanic breccia, are mainly developed in yc33;in yc32, intermediate-basic volcanic edifices are mainly developed, dominated by andesite in the upper part and basalt in the lower part. ② Two basalt masses (with a respective area of 2 and 22km2) and three andesite masses (with a respective area of 1. 6, 6. 5, and 22. 6km2) are identified. The above achievements lay a foundation for predicting the gas reservoirs of volcanic edifices.
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