Recognition of Theoretical System of Subtle Reservoirs Exploration

Subtle reservoir has been gradually becoming the main field of oil and gas reservoirs exploration,and it is rapidly developed for their theories and exploration methods.Four theories like as sequence stratigraphy,paleogeomorphic,slope-beak zone and source-constrained oil have guided the formation mechanism of subtle reservoir and distribution.The space above and under the unconformity surface and low stand system in the third-order sequence is a favorable place for subtle reservoir.The transport and seal for unconformity surface itself is the key factor for subtle reservoir formation.The palaeogeomorphology and slope-beak zone constrained the spatial distribution of reservoir and hydrocarbon accumulation gave a guide for horizontally tracing the subtle reservoir.The location of high-quality source rock and reservoir would predict the scope of subtle reservoir.