New insights into the evaluation criteria for high-quality deep marine shale gas reservoirs in the Longmaxi formation: Evidence from organic matter pore development characteristics

Porosity, total organic carbon content, brittle mineral and gas content are now the primary references for classifying evaluating marine shale reservoirs in China. Is there a more effective appropriate reservoir classification scheme deep shale? The Longmaxi Formation Luzhou, southern Sichuan Basin, China, is main object of study. Quantitative analysis modeling using data from field emission scanning electron microscopy, nitrogen adsorption, logging were used to characterize matter (OM) pore multi-scale development reveal relationship between OM high-quality reservoirs. Microscopic macroscopic indications pores show that large number developed surface porosity occupancy Luzhou area was than 60%. 50%. adsorption–desorption hysteresis loops demonstrate bottleneck wedge-shaped pores. Characterization structure by box dimension, volume specific area. It found key formation massive mesopores siliceous relatively homogeneity structure, which conducive enrichment migration gas. Furthermore, improved model decreased relative error predicting about 32.5%. use better, results consistent with geological understanding. showed Lunanxi Rongchang Jiangjin exploration Sichuan. This study expected provide new idea classification.