High-Resolution Three-Pressure Prediction of Lianggaoshan Formation in LT1 Well block of Eastern Sichuan Risk Exploration Area
Yu-wei Wang,*, Ke-zhen Wan, Rong-rong Zhao, Wen-hao Li, Yang Lin, Hao Long, and Hu Zhao
1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500;
2. Petrochina Southwest Oil&Gas fi eld Company Exploration Division, Chengdu 610041;
3. BGP In., China National Petroleum Corporation Southwest Geophysical Research Institute, Chengdu, Sichuan 610213
Abstract：
The Jurassic Lianggaoshan Formation in eastern Sichuan Basin is a key target for shale oil exploration. It faces challenges in three-pressure prediction due to complex structural and sedimentary interactions, as well as strong reservoir anisotropy. These issues often lead to wellbore instability and gas logging anomalies during drilling. This study presents an integrated workflow that combines residual moveout correction using correlation-based dynamic time warping (CDTW), high-resolution seismic waveform indication inversion, and three-pressure prediction of jointing well-seismic data. Applied to the LT1 well block,the workflow effectively corrects anisotropic residual moveout in image gathers, leading to a signal strength increase of over 10% in frequency bands above 30 Hz and enhancing event continuity. High-resolution rock mechanical parameters are obtained through seismic waveform inversion and regional calibration, enabling the prediction of three-dimensional pore pressure, collapse pressure and fracture pressure. The results are consistent with actual drilling gas shows and core data, confirming the method's accuracy and supporting mud weight planning and wellbore stability efforts. This cost-effective and technically robust approach proves highly reliable in complex environments with significant heterogeneity and anisotropy, assisting drilling decisions and risk management in eastern Sichuan and similar challenging geological settings.
作者简介: Wang Yuwei, Lecturer, received a Bachelor's degree in Geophysics in 2006 and his Doctorate in Solid Earth Geophysics in 2016, both from Tongji University. He is currently a Lecturer at the School of Geoscience and Technology, Southwest Petroleum University, mainly engaged in teaching and research related to seismic tomography and waveform inversion.
2025, Vol. 22 
