Abstract:The main channel with relatively large scale of Neogene in the Bohai Sea is the key research object of rolling evaluation potential search. However, this type of channel usually extends far and the silty content of mudstone changes rapidly, which leads to the large difference in the wave impedance of the surrounding rock of the target reservoir and strengthens the false seismic response of the reservoir caused by the difference of surrounding rock. Therefore, the seismic response amplitude of the reservoir cannot effectively reflect the real changes of reservoir development, which brings great challenges to the fine prediction and characterization of the reservoir in the study area. We analyzed the characteristics and mechanism of seismic response under such complex geological conditions through forward modeling to establish the relationship of the waveform information of seismic response cha-racteristics with the corresponding phase information and geological information. We innovatively proposed an adaptive strong reflection separation method based on seismic phase decomposition. This method firstly obtains accurate and effective phase spectrum with high resolution by sparse inversion complex spectral decomposition via sparse inversion. Then the inverse transform is applied to all frequency components of the phase spectrum to form phase gather and realizes the stable phase decomposition and reconstruction of seismic data, which constructs a new seismic geological interpretation. It can effectively remove the phase component of strong reflection interference caused by the special surrounding rock and other factors to highlight the target reservoir, solving the seismic response distortion affected by the difference among surrounding rocks. Finally, the application results of theoretically synthetic data and actual data show that the new method proposed in this paper significantly improves the accuracy of reservoir prediction. It provides an important basis for the scientific deployment of wells and the calculation of proven oil reserves in the rolling evaluation of BZ Oilfield in Bohai Bay.
张军华, 刘振, 刘炳杨, 等.强屏蔽层下弱反射储层特征分析及识别方法[J]. 特种油气藏, 2012, 19(1):23-26.ZHANG Junhua, LIU Zhen, LIU Bingyang, et al.Analysis and identification of reservoir characteristics of weak reflectors under strong shielding layer[J]. Special Oil & Gas Reservoirs, 2012, 19(1):23-26.
[2]
秦雪霏, 李巍.大牛地气田煤系地层去煤影响储层预测技术[J]. 吉林大学学报:地球科学版, 2014, 44(3):1048-1054.QIN Xuefei, LI Wei.Research of identification and trimming of coal-bed interference in Daniudi gas field[J]. Journal of Jilin University:Earth Science Edition, 2014, 44(3):1048-1054.
[3]
Wang Y H.Multichannel matching pursuit for seismic trace decomposition[J]. Geophysics, 2010, 75(4):V61-V66.
[4]
李海山, 杨午阳, 田军, 等.匹配追踪煤层强反射分离方法[J]. 石油地球物理勘探, 2014, 49(5):866-870.LI Haishan, YANG Wuyang, TIAN Jun, et al.Coal seam strong reflection separation with matching pursuit[J]. Oil Geophysical Prospecting, 2014, 49(5):866-870.
[5]
朱博华, 向雪梅, 张卫华.匹配追踪强反射层分离方法及应用[J]. 石油物探, 2016, 55(2):280-287.ZHU Bohua, XIANG Xuemei, ZHANG Weihua.Strong reflection horizons separation based on ma-tching pursuit algorithm and its application[J]. Geophysical Prospecting for Petroleum, 2016, 55(2):280-287.
[6]
杨子鹏, 宋维琪, 刘军, 等.多道联合约束的匹配追踪强反射轴压制方法[J]. 石油地球物理勘探, 2021, 56(1):77-85.YANG Zipeng, SONG Weiqi, LIU Jun, et al.A me-thod of combining multi-channel signals to suppress the strong reflection through matching pursuit[J]. Oil Geophysical Prospecting, 2021, 56(1):77-85.
[7]
Wang Y H.Seismic time-frequency spectral decompo-sition by matching pursuit[J]. Geophysics, 2007, 72(1):V13-V20.
[8]
杨培杰, 罗红梅, 王金铎.地震数据分相位重构方法[J]. 石油地球物理勘探, 2019, 54(3):594-599.YANG Peijie, LUO Hongmei, WANG Jinduo.Seismic data phase reconstruction[J]. Oil Geophysical Prospecting, 2019, 54(3):594-599.
[9]
张生强, 张志军, 谭辉煌, 等.流体流度与时频相位融合的油气检测方法及应用[J]. 石油地球物理勘探, 2019, 54(4):853-859.ZHANG Shengqiang, ZHANG Zhijun, TAN Hui-huang, et al.Hydrocarbon detection with fluid-mobility and time-frequency phase fusion[J]. Oil Geophysical Prospecting, 2019, 54(4):853-859.
[10]
Bonar D C, Sacchi M D.Complex spectral decomposition via inversion strategies[C].SEG Technical Program Expanded Abstracts, 2010, 29:1408-1412.
[11]
张生强, 韩立国, 李才, 等. 基于高分辨率反演谱分解的储层流体流度计算方法研究[J]. 石油物探, 2015, 54(2):142-149.ZHANG Shengqiang, HAN Liguo, LI Cai, et al.Computation method for reservoir fluid mobility based on high-resolution inversion spectral decomposition[J]. Geophysical Prospecting for Petroleum, 2015, 54(2):142-149.
[12]
张生强, 张志军, 郭军, 等.时频空间域低频约束AVO响应校正方法[J]. 石油地球物理勘探, 2021, 56(1):137-145.ZHANG Shengqiang, ZHANG Zhijun, GUO Jun, et al.AVO response correction constrained by low-frequency components in time-frequency-space domain[J]. Oil Geophysical Prospecting, 2021, 56(1):137-145.
[13]
Chen S S, Donoho D L, Saunders M A.Atomic decomposition by basis pursuit[J]. SIAM Journal on Scientific Computing, 1998, 20(1):33-61.
[14]
Yang J F, Zhang Y.Alternating direction algorithms for L1-problems in compressive sensing[J]. SIAM Journal on Scientific Computing, 2011, 33(1):250-278.
[15]
Castagna J, Oyem A, Portniaguine O, et al.Phase de-composition[J]. Interpretation, 2016, 4(3):SN1-SN10.
[16]
高云鹏, 滕召胜, 曾博, 等.基于Kaiser窗频谱校正的介质损耗因数测量[J]. 电工技术学报, 2009, 24(5):203-208.GAO Yunpeng, TENG Zhaosheng, ZENG Bo, et al.Dielectric loss factor measurement based on Kaiser window spectral correction[J]. Transactions of China Electro Technical Society, 2009, 24(5):203-208.