MARINE SEDIMENTARY SEQUENCES AND MAJOR GAS FIELDS IN CHINA

Height of forebulge and orogenic belt and width of the Kuqa foreland basin have been calculated in the burial and tectonic subsiding history recovery on the base of flexural profile equation for a broken、thin、infinite、elastic plate. The results indicated:(1) The original sedimentation distribution in the Triassic-Jurassic and the Early Cretaceous appeared east-north orientation; (2) The tectonic subsiding curves can be divided into three sections of "steep-gentle-steep" at north of the Kuqa foreland basin, but it was turn into four sections of "gertle-step-gentle-steep" at south parts; (3) The transect profiles of sedimentation structure in the Kuqa foreland basin showed a typical "doorstop" wedge shape in the Early(P₂-T) and Later(N-Q) periods, but a asymmetric "V" shape in the medium periods(J-E).