【正文】 ells had been drilled, which of them 17 wells were successfully from 2020 to 2020. There is accumulation proved reserves Was up to 2362x104t. and predict reserves was to 3684x104t . Keywords： Paleogene。 Neogene。 unconformity stratigraphie reservoirs。 Fomation mechanism。 distribution pattern。 Jiyang depression Formation Mechanism and Distribution of PaleogeneNeogene Stratigraphic Reservoirs in Jiyang Depression 3 1. Preface Foundationnd and signifacance of the topic Theme origin The theme is from the Sinopcc project： Forming and distribution of Tertiary stratigraphic reservoir of Jiyang depression . Theme number： P06012， deadline： 20202020 Foundation and baekground of the theme The tectonic events frequently occurred in Jiyang depression in paleogeneNeogene． It was favour of forming stratigraphic reservoir because of existence of several kinds of unconformity . Based on statistical data , beneficial area reservoired oil is about 9500km2, and the remaining resource is about 16x 108t in stratigraphic reservoirs of paleogeneNeogene stratas． Since 1980s， many overlap and unconformity reservoirs have been founded , explored reserves Was apparently increased with deep exploring. By the end of 2020 , explored resource had been up to 108t which showed a large exploring potential. But , in fact , the research on stratigraphic reservoir is lack or Uttle , especially, Accumulation pattern and forecasting model of oil have not been studied systematically. For example , the successful ratio of exploration well testing which is the lowest in allkinds reservoirs Was only ％ about stratigraphie reservoir in paleogeneNeogene in Jiyang depression from 20202020 . The main loss reason for the overlap andunconformity reservoirs exploration is migration and trap of oil that is ％ and ％ .Hereby , oil migration problem and trap validity are importantaspects for overlap and unconformity reservoir exploring. In short， it has three aspects as followed： (1)Shallow prehension about conduction of ability of unconformity Research on unconformity in present indicated that it is not a simple surface threedimension body which is important for migration of oil and gas． There has some deep knows about the basins in west China and the marine basins in China. The systematic theory is lack about structure characteristic which deeply affect accumulating oil and gas. (2)The remain uncertain migration and accumulation process of oil and gas about Formation Mechanism and Distribution of PaleogeneNeogene Stratigraphic Reservoirs in Jiyang Depression 4 stratigraphic reservoir remain uncertain . Stratigraphic reservoir lay in edge of basin . So it is difficult to exactly hold accumulation regular of oil and gas because far distance traps and hydrocarbon resources make a plicated migration process. (3)Forecasting model of stratigraphic reservoir that could be used to guide explore is lack It is necessity to finely evaluate and explore stratigraphic reservoir along with degree of exploration. Mayor controlling factors remain uncertain in construction of forecasting model of stratigraphic reservoirs. Aim, sense and application value of theme The study resolves the problem of statigraphic reservoir formation and distribution of PaleogeneNeogene in Jiyang depression. By analysis of uniformity structure, their affect on statigraphic reservoir formation will be identify。 The accumulation model will be established through study on static geologic characteristic of statigraphic reservoir 。 Forecast mode of oil extent will be achieved through research on oil extent and to predict oil quality. Research results Can not only be used to effectively guide statigraphic reservoir Exploring, to raise drilling Success ratio, provide technical support for increasing oil production of the Sinopec, and also provide reference to statigraphic reservoir exploring of Bohai Bay area . Research will enormously deepen statigraphic reservoir accumulation regular and further enrich and improve subtle reservoir exploring theory . Research present at home and abroad Present research and development at home and abroad Unconformity reservoir is one of important exploring object since Levorsen proposed the concept of stratigraphic trap and then published paper on??Stratigraphic oil field ” in 1 936． It turns into stratigraphic reservoir and lithology reservoir based on scholars deepenly research the Levorsen stratigraphic eservoir . Stratigraphic trap is formed as a result of the updip reservoir directly contigence with unconformity above. According to trap place, accurrence and barrier, stratigraphic oil pools is divided into overlap pool, unconformity barbered pool and ancient buriedhill pool . Unconformity reservoir research covers three main sections. One is unconformityand its Formation Mechanism and Distribution of PaleogeneNeogene Stratigraphic Reservoirs in Jiyang Depression 5 effect on oil accumulating. The second section is developing paaem of stratigraphic trap. The third is mechanism of migrating and accumulating of oil and gas. Present studies mainly focus on the three sections above ． (1)Unconformity and its effect on oil accumulation Unconformity is geology base and key element to form the overlap and unconformity barriered traps and relevant reservoir . In generally,research on overlap and unconformity barrier reservoirs is first unconformity research target. Oil geologists started to understand relationship between inconformity and oil and gas acumination in 1930s. Levorsen published the book of“geology of petroleumin39。1954. The book entirely introduced definition and significance of unconformity and the relatiooships with oil accumulation .T