Control Effect of Neotectonic Movement on Hydrocarbons in Tarim Basin

The neotectonic movement around Tarim basin assumes intense thrust nappe structure.The Xiyu formation of Lower Pleistocene(Q1x) in different areas around the basin thrusts into different strata or is covered by old strata in different ages and rolled into folds in different scales.3D seismic interpretation indicates that regional tectonic inversion occurs in strata above Silurian system in Tarim platform area owing to neotectonic movement,leading to southward migration of top structural highs in different horizons.The neotectonic movement has two effects on controlling hydrocarbons in Tarim basin.One is that some large-scale structural traps favorable for late-stage hydrocarbon accumulation were formed around this basin and provided huge power for hydrocarbon migration in late stage.The other is the movement changed and reconstructed the trap conditions of ancient oil reservoirs shaped in early stage,resulting in the hydrocarbon remigration in them and consequently forming new oil reservoirs with complex oil-water contact and still being charged with fluid nowadays.