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基于济阳坳陷青东凹陷油气勘探新局面,采用地质、地球化学、测井资料分析与三维地震精细解释相结合的研究方法,研究了青东凹陷油气成藏的基本条件,对关键成藏地质要素进行重新厘定,建立油气成藏模式,认为青东凹陷是新生代郯庐断裂走滑背景下的斜向拉张断陷盆地,发育3种构造样式;青东凹陷沙四上亚段主力烃源岩具有早生速排的演化特征;发育多类型油气藏.研究结果表明:受郯庐断裂带走滑作用控制,近东西向、北西-北西西向与北北东向3套主要断裂的发育使凹陷内部南北方向形成“堑垒相间”的构造格局,东西向上呈现东断西超的凹陷结构;构造样式以伸展、伸展-走滑构造样式为主,反转构造样式仅在局部发育;沙四上烃源岩转化率快速变化在2 500~3 500m之间,成烃范围较集中,生烃潜力大;南北向构造、岩性油藏相间分布,东西向地层—构造地层—构造岩性—岩性—构造油气藏有序分布,成藏模式分陡坡复式运聚成藏、凹中隆近源运聚成藏、斜坡带断层走向运聚和洼陷内原地生储成藏模式.
Based on the new situation of oil and gas exploration in Qingdong depression in Jiyang depression, this paper studied the basic conditions of hydrocarbon accumulation in Qingdong depression by using the methods of geology, geochemistry, logging data analysis and fine interpretation of 3D seismic data. Geological elements to be redefined, the establishment of oil and gas accumulation pattern, that the Qingdong depression is the Cenozoic Tan-Lu fault slip strike background diagonal stretch fault basin, the development of three kinds of structural styles; The source rocks have the characteristics of the evolution of the early rapid traps and the development of various types of reservoirs.The results show that the development of three major faults controlled by the strike-slip of the Tan-Lu fault zone, near-east-west, northwest-northwest-west and north- So that the north and south directions of the depression form the tectonic framework of “cutting barrier and interphase ”, showing the sag structure of the east and west of the east-west upward. The tectonic styles are dominated by extensional and extensional-strike-slip tectonic styles and the inversion tectonic styles only develop locally ; The conversion rate of source rocks in Sha 4 is rapidly changing from 2 500 to 3 500 m with a relatively high hydrocarbon generation potential and high potential for hydrocarbon generation; north-south structure, interphase distribution of lithologic reservoirs, east-west strata-tectonic strata-tectonics rock - lithologic - structural reservoir ordered distribution, accumulation model partial duplex steep migration and accumulation, in the long recess proximal migration and accumulation, migration and accumulation slope with fault strike Depression and the reservoir-situ accumulation mode.