以油气区(盆地群)为单元,基于“源热共控论”,分析了中国大陆及海域油气田纵向成烃规律.结果表明,我国油气田的油气成烃模式非常有序:①东南部海域油气区包括东海和南海的盆地,纵向上呈单相成烃模式,源热共控生油或者生气,其中近岸带以油为主,远岸带以气为主;②东部油气区包括渤海湾盆地 — 松辽盆地 — 江汉盆地带、北黄海— 南黄海盆地,成烃呈“上油下气”双层模式;③中部油气区包括鄂尔多斯盆地 — 四川盆地 — 楚雄盆地带,成烃呈“上油下气”双层模式;④西部油气区包括准噶尔盆地、塔里木盆地、吐哈盆地和柴达木盆地等,成烃呈“三明治”式多层模式.结论认为:①“源热共控”中国油气勘探的重大领域;②找油领域为东南海域的近岸带,东部油气区的上部层系,中部油气区的上部层系,西部油气区的奥陶系、二叠系和古近系;③找气领域为东南海域的远岸带,东部油气区的中深层,中部油气区中深层,西部油气区的寒武系、石炭系、侏罗系和第四系等多个层系;④呈现出油田下面找气田、气田底下找油田、油田外面找气田、气田外面找油田的格局;⑤我国油气勘探领域依然广阔.
Taking a hydrocarbon zone or a basin group as a unit, this paper, based on the theory of hydrocarbon generation controlled by source rocks and geothermal heat, analyzed the vertical hydrocarbon generation rule of China continental and offshore oil and gas fields. The following results demonstrated the regularity of hydrocarbon generation modes in various oil and gas fields in China. First, the hydrocarbon generation zones of southeastern China offshore area, including the East and South China Sea basins, were dominated by single hydrocarbon generation mode, which displays as either single oil generation in the near shore or single gas generation in the offshore controlled by both source rocks and heat. Second, the eastern hydrocarbon generation areas, including the Bohai Bay, Songliao, Jianghan basins and the North and South Yellow Sea basins, were dominated by two-layer hydrocarbon generation mode, which performs as "upper oil and lower gas". Third, the central hydrocarbon generation areas, including the Ordos, Sichuan and Chuxiong basins, were also dominated by the "upper oil and lower gas" two-layer hydrocarbon generation mode. In the Ordos Basin, gas was mainly generated in the Triassic, and oil was predominantly generated in the Paleozoic. In the Sichuan Basin, oil was discovered in the Jurassic, and gas was mostly discovered in the Sinian and Triassic. Fourth, the western hydrocarbon generation ar- eas were dominated by the "sandwich" multi-layer mode, such as the Junggar, Tarim, Qaidam basins. In summary, the theory of hydrocarbon generation controlled by source rocks and heat will be widely applied to oil and gas exploration all over China. Oil targets should be focused on the near shore area in the southeast China sea, the upper strata in the eastern and middle hydrocarbon zones, and the Ordovician, Permian and Paleogene strata in the western hydrocarbon zone, while gas targets should he focused on the off shore area in the southeast China sea, the Cambrian, Carboniferous, Jurassic, and Quate