Hydrocarbon Detection in Coal Measure Strata Using Quantitative Color Compensation Based on Advantage Frequency Bands

Due to the close relationship with the unconventional reservoir exploration, coal measure strata have become a key focus in recent years. MECKEL L D et al. (2008) highlighted the challenges of tight-gas reservoirs. This study specifically focuses on the challenging of hydrocarbon detection in the tight sandstone of coal measure strata. The factors associated with coal seams, such as strong energy shielding and interference, significantly affect the seismic reflection of underlying strata. This paper proposes specific hydrocarbon detection methods for two models: one focuses on scenarios where coal seams and adjacent reservoirs have significant thickness and close proximity, and the other is characterized by thin interbedded layers of coal, sand, and shale. The study explores the advantageous frequency bands for coal measure strata and introduces a quantitative method to enhance high-frequency energy in seismic data, thereby mitigating the negative impact of coal seams on underlying strata. Ultimately, through the reprocessing of well and seismic data, the ability to identify favourable reservoirs in coal measure strata is improved, enhancing the accuracy of inversion in these strata.