Application of high resolution sequence stratigraphy to determination of key intervals in Beibuwan Basin
SUN Xiaohan1, QU Hongjun1, HUANG Suwei2, WU Longfa1, YANG Bo1, YAO Tianxing1
1 State Key Laboratory of Continental Dynamics,Northwest University,Xi’an 710069,China; 2 Exploration and Development Research Institute,Shanghai Offshore Oil & Gas Branch,SINOPEC,Shanghai 200120,China
Abstract Beibu Gulf Basin is one of the five major oil-bearing basins in the north of the South China Sea, with great potential for oil and gas resources and good exploration prospects. However, little research has been done on the thick Weizhou Formation in the Haizhong Depression, the third-level structural unit of the Beibu Gulf Basin. This significantlyhinders the hydrocarbon exploration in the Haizhong Depression. High resolution sequence stratigraphy is an effective method for stratigraphic division in geographic exploration frontiers. Using 3D seismic, well logs and core data, and on the basis of identification of second-order and third-order sequence boundaries on seismic profiles and wells, this paper uses maximum entropy spectral analysis, wavelet transform analysis and core analysis methods to identify and subdivide the high-resolution sequences of the Weizhou Formation. The results show that the maximum entropy spectral analysis has high resolution for third-order and fourth-order sequence boundaries; wavelet transform can analyze fourth to sixth order cycles and higher order cycles; Core data can be used for short-term and ultra-short-term cycle analysis. Based on 3D seismic, well logging, maximum entropy spectral analysis, wavelet transform technology and core data, the Weizhou Formation can be divided into 1 second-order sequence that includes 6 third-order sequences, which are in turn composed of 13 fourth-order sequences. According to the comparison of 13 fourth-order sequences, the highest sand ratio occurs in SQ6 LST , which is followed by SQ6 HST, suggesting great exploration potential. This study indicates that high resolution sequence stratigraphy of multi-scale and multi-method has certain guiding significance for screening key intervals in depression with low degree of exploration.
Fund:Financially supported by the National Science and Technology major project “Thirteen Five-Year” sub-project (No. 2016ZX05026007-007)
Corresponding Authors:
QU Hongjun,born in 1967,professor,doctoral supervisor,is engaged in sedimentology. E-mail: hongjun@nwu.edu.cn.
About author: SUN Xiaohan,born in 1997,is a master degree candidate. His research interest is sedimentology. E-mail: 1913505165@qq.com.
Cite this article:
SUN Xiaohan,QU Hongjun,HUANG Suwei et al. Application of high resolution sequence stratigraphy to determination of key intervals in Beibuwan Basin[J]. JOPC, 2024, 26(2): 308-325.
SUN Xiaohan,QU Hongjun,HUANG Suwei et al. Application of high resolution sequence stratigraphy to determination of key intervals in Beibuwan Basin[J]. JOPC, 2024, 26(2): 308-325.
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