Structural deformation characteristics and its influence on shale gas preservation of the Wufeng−Longmaxi Formation in the Wuxi area, Chongqing, China

The Upper Ordovician Wufeng to Lower Silurian Longmaxi Formation has a good material basis for marine shale gas development, and the structural preservation condition is key factor control rich integrated reservoirs in Wuxi area of Chongqing City, China. Based on seismic-structural interpretation data, combined with regional background drilling effect, deformation characteristics conditions are comprehensively analyzed study area. located at junction Sichuan Basin southern Dabashan along strong deformations. Seven rows NW near EW belts mainly developed. fold styles fault development degrees different different, difference also obvious. results reveal that structure Wufeng−Longmaxi overall poor only locally better. enrichment accumulation divided into four grades, such as Class I area, general II III very IV Among them, Heiloumen zone Huangcaoping buried nearby have classified macroscopic type belongs complex basin margin. Three modes been confirmed, including lost destruction type, residual trap type. more conducive gas, which most favorable mode exploration.