Influence of Formation Lower Limit on the Physical Properties of Shrinkage Pores in a Tight Sandy Conglomerate Sample.

For shrinkable pore-developed sandy conglomerate formation, the identification of the formation lower limit is of great significance in characterizing the physical properties. In this paper, a 3D gray image of a shrinkage pore-developed sandy conglomerate sample is obtained with micro-CT scanning, the maximum class spacing algorithm is used for binarization segmentation to construct the 3D shrinkage pore digital rock, and the corresponding shrinkage pore network model is extracted through the maximum ball algorithm. By applying the shrinkage pore network model, different formation lower limit RT values are set to eliminate the pores and throats below the lower limit value, and the corresponding shrinkage pore network model is built to calculate the physical parameters.

Differential characterization of stress sensitivity and its main control mechanism in deep pore-fracture clastic reservoirs.

Stress sensitivity in reservoirs is critical during the exploitation of oil and gas fields. As a deep clastic reservoir under strong tectonic compression, the Ahe Formation in the northern tectonic zone of the Kuqa depression exhibited strong stress sensitivity effect. However, the conventional evaluation method by using permeability damage rate as a constraint restricts the mechanistic understanding of the strong stress sensitivity effect.

Biodegradation influence on alkylphenanthrenes in oils from Bongor Basin, SW Chad.

Oil samples from the Bongor Basin, SW Chad have been geochemically characterized to investigate the biodegradation influence on alkylphenanthrenes. Concentrations of C0-3-alkylphenanthrenes (C0-3Ps) increase markedly after level 6 biodegradation due to the removal of other vulnerable components, decrease sharply after level 7 biodegradation and approach to absence at level 8. Phenanthrene appears to have higher ability to resist biodegradation than C1-3Ps at certain biodegradation levels (≤level 7) due to demethylation, which has been inferred as a possible reaction process during biodegradation of the aromatic hydrocarbons.