The Anomalous Low Pressure (Negative Pressure) and Hydrocarbon Accumulation in a Sedimentary Basin
沉积盆地异常低压（负压）与油气分布

With the development of petroleum exploration, many abnormal overpressure fields and negative pressure fields were found in the world. The negative pressure and hydrocarbon accumulation are quite important in oil and gas exploration. In this paper, the authors describe the basic concept, features and classification of negative pressure and discuss in detail its formation mechanism, which includes rebound with uplifting and erosion, low recharge rates of liquid, diffusion of unstable hydrocarbon, pressure release of the fault and surface unconformity, permeable strata and decrease of temperature. The mechanism of negative pressure in oil-and gas-bearing basins and the relationship between negative pressure and hydrocarbon accumulation are also discussed. The formation of negative pressure compartments controls petroleum migration and accumulation. The negative pressure system indicates that the oil and gas pools are secondary. It opens a new exploration field for secondary oil and gas reservoirs and deep basin gas in the sedimentary basin.