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Prediction of Marine Thin Shale Gas Reservoir with Seismic Phase-Controlled Nonlinear Stochastic Inversion
Xie, Qingming1,2; Wu, Yanming1; Huang, Qian1; Hu, Yunbing1; Hu, Xiaoliang1; Guo, Xiaozai2; Jia, Dongming2; Wu, Bin3
2023-08-01
摘要Due to the complicated interference sources and low signal-to-noise ratio of seismic records, conventional seismic inversion methods are difficult to accurately identify shale gas reservoirs with a thickness of less than 10 m. This presents great challenges to shale gas exploration and development in China. Seismic phase-controlled nonlinear stochastic inversion (SPCNSI) is related to the heterogeneity of underground media. With the constraints of the stratigraphic sequence or seismic facies models, the minimum value between the seismic model and seismic record can be solved through iterative processes. Based on the solved acoustic velocity in formation, the constraints for SPCNSI can be formed with the matching relationship between target layers and different sequences in three-dimensional space. The prediction resolution of an unconventional reservoir can be effectively improved by combining logging, geological and seismic information. The method is suitable for predicting thin shale gas reservoirs in complex geological structures. In this study, SPCNSI was developed to predict the thin-layer marine shale gas reservoir in the southeast of Chongqing; the horizontal and vertical distribution characteristics were proven in the Longmaxi Formation and the Wufeng Formation; thin layers with a thickness of less than 7 m were also discovered. According to the results, three sets of potential development areas were determined by the inversion method, and the accuracy and reliability of the method were verified by logging and productivity testing.
关键词nonlinear stochastic inversion reservoir prediction seismic facies shale gas thin layer
DOI10.3390/pr11082301
发表期刊PROCESSES
卷号11期号:8页码:15
通讯作者Xie, Qingming(xieqingming@cqcet.edu.cn)
收录类别SCI
WOS记录号WOS:001057696900001
语种英语