Abstract:

Braided delta front facies is the major depositional system developed in Late Triassic Xujiahe Formation in Mregion, where deposited a large set of sandstone with mudstone thin layer. The reservoir is typical sand bag mud sedimentation and tight sandstone reservoir with very lowporosity and permeability, and porous sandstone is the main reservoir type. Therefore, howto effectively distinguish the thin mudstone layer and none-reservoir dense sandstone is very important for reservoir prediction in Mregion. This paper used gamma inversion and porosity curve fitting acoustic inversion to reflect the porous reservoir response and conduct comprehensive reservoir prediction. The result shows that the northwest ofMregion is the main streamchannel development area, where reservoir is relatively developed.

Key words: ultra-lowpermeability, depressurization and stimulation of injection well, interfacial tension force, antiswelling agent, inhibition agent