Paper Summary
The deep-gas reservoirs of China’s western Sichuan Basin are in Members 2 and 4 of the Upper Triassic Xujiahe Formation. Th ese reservoirs contain mid- to large-sized gas fields like Xinchang, Hexingchang, Qiongxi, Zhongba, and Bajiaochang. Th e favorable geological conditions for creating these fields include abundant source rock, well-developed reservoir rock, good preservation conditions, and structural traps.
These reservoirs also have very low porosity and permeability, high pressure, complex gas-water relationships, and complex reservoir heterogeneity, which make it challenging to use conventional seismic technologies to predict and identify the complex reservoir and fracture systems. However, multicomponent seismic technology can acquire converted-wave
data that reflect rock matrix information and anisotropy and P-wave data that reflect matrix and fluid characteristics. Th is article describes how this technology solved such problems as
identification of high-quality reservoirs and detection of fractures and its potential for determining fluid characteristics in the deep-gas reservoirs of the western Sichuan Basin.