东海陆架盆地西湖凹陷渐新统花港组年代标尺及层序界面定量识别

doi:10.11743/ogg20220419

Abstract

Abstract:

The Xihu Sag is one of the petroliferous sags in the East China Sea Shelf Basin. Recent exploration has confirmed that the Oligocene Huagang Formation is the major gas pay zone in the sag. However， sequence division of the formation is still in dispute， seriously impeding the isochronous correlation of sand bodies and the fine exploration of oil and gas. Based on the sequence stratigraphy and astronomical cycle theory， the study mathematically analyzes natural gamma curves with wavelet transform and INPEFA（Integrated predication error filter analysis） technology to obtain signal curves， spectrums and INPEFA curves for the establishment of a geologic time scale and high-precision sequence boundary framework for the Huagang Formation. The GR curves are reconstructed through wavelet transformation into different wavelet signal curves and spectrums with the sequence interfaces and cycle information highlighted by abnormal vibration and energy group change trend. At the same time， the maximum entropy spectrum analysis technology is used to integrate the GR curves into the INPEFA curves with sequence boundaries and cycle information highlighted by inflection points as well as positive and negative trends. The Huagang Formation is divided into five third-order sequences （namely SQ₁ to SQ₅ from top to bottom）. Spectral characterization of strata superimposition and cycles within these sequences are combined with their wavelet signal curves to divide the Huaguang Formation into a total of 12 fourth-order sequences （namely H₁ to H₁₂ from bottom to top）. The multi-window spectrum analysis of GR curves shows 1 to 3 Ma development duration for the five third-order sequences. The multi-scale and multi-method integration of logging technology for the construction of multi-order isochronous stratigraphic frameworks in the areas lacking of cores and paleontological fossils is proved to have certain promotional value for the future oil and gas exploration in the Oligocene Huagang Formation of the Xihu Sag.

Key words: wavelet transform, INPEFA, astronomical cycle, sequence stratigraphy, Huagang Formation, Oligocene, Xihu Sag, East China Sea Shelf Basin

CLC Number:

TE121.3

Xian Liu, Jiawang Ge, Xiaoming Zhao, Guofeng Yin, Xuesong Zhou, Jianwei Wang, Maolin Dai, Li Sun, Tingen Fan. Time scale and quantitative identification of sequence boundaries for the Oligocene Huagang Formation in the Xihu Sag， East China Sea Shelf Basin[J]. Oil & Gas Geology, 2022, 43(4): 990-1004.

Figures/Tables 2

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Time scale and quantitative identification of sequence boundaries for the Oligocene Huagang Formation in the Xihu Sag， East China Sea Shelf Basin

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