成藏史数值模拟——以渤海湾盆地文安斜坡古生界为例

通过成藏温度、压力及生、储、盖、运、圈、保的数值模拟,建立了成藏史数值模拟系统,并以渤海湾盆地文安斜坡为例说明了这一系统的应用。研究表明,渤海湾盆地文安斜坡古生界煤成烃油气藏的形成有两期:第一期发生在中生代末,但成藏后被其后的燕山运动破坏;第二期在老第三纪,是油气藏形成的主要时期。本区的油气藏形成主要取决于生、排烃史与圈闭形成期的匹配和油气藏形成之后的保存条件,所以冀中坳陷古生界原生油气藏的勘探应集中于那些喜山期形成、且位于二次生烃区内及其周围的圈闭。 

NUMERICAL SIMULATION OF POOL-FOMING HISTORY--A CASE STUDY OF THE PALEOZOIC IN THE WEN'AN SLOPE OF THE BOHAIWAN BASIN

A numerical simulation system of pool-forming history was established by modelling the development history of source rocks,reservoirs,cap rocks and traps as well as primary migration,preservation conditions,paleotemperature and pressure.As an example,it was used in the Paleozoic of the Wen'an (Slop,the Bohaiwan Basin.The results showed that the Paleozoic coal-related hydrocarbon pools in the) Wen'an Slope of the Bohaiwan Basin were formed in the two periods.The first was the end of the Meso-zoic,but the formed pools were disrupted by the Yanshanian movement afterwards.And the second was the Palaeogene,which was the major period of pool formation.The formation of hydrocarbon pools in the study area mainly depended on the matching of hydrocarbon-generating history and hydrocarbon-expelling history to trap formation periods and the preservation conditions of hydrocarbon pools after their formation.So the exploration for the Paleozoic original hydrocarbon pools in the Jizhong Depression should be focused on the traps formed in the Himalayan period and situated within and around the secondary hydrocarbon-generating areas.