Relationship between Accumulation of Natural Gas andGeotemperature-Geopressure System in Yinggehai Basin
莺歌海盆地地温—地压系统特征及其对天然气成藏的意义

Yinggehai Basin is a youthful Cenozoic sedimentary basin with extension and transform. There are relationships between geotemperature-geopressure system, source rock thermal evolution and migration accumulation of natural gas. Based on the analysis of the distribution of the geopressure field and the geotemperature field, there are two types of geotemperature-geopressure systems in the basin; composite geoperature-geossure system of high pressure in the central sag and singleness of temperature-geopressure system in the Yingdong slope.The controlling function of different geotemperature-geopressure systems on migration and accumulation of natural gas were analyzed. The vertical migration and accumulation of natural gas are under the control of conducting system and composite temperature-pressure system of high pressure, and the singleness of geotemperature-geopressure system and feebleness of vertical hydrodynamic force are the main reasons for lateral migration of the gas. There are important relationships between the migration of natural gas and the geotemperature-geopressure systems in the Yinggehai basin.