青东凹陷油气成藏条件再认识

发布时间：2018-01-05 23:26

本文关键词：青东凹陷油气成藏条件再认识　出处：《中国矿业大学学报》2017年05期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:Based on the new situation of oil and gas exploration in Qingdong sag of Jiyang depression, the basic conditions of oil and gas reservoir formation in Qingdong sag are studied by combining geological, geochemical, logging data analysis and 3D seismic fine interpretation. The key geological elements of reservoir formation are redefined and the oil and gas accumulation model is established. It is considered that the Qingdong depression is an oblique extensional fault basin under the background of the Cenozoic Tanlu fault strike-slip and develops three structural styles. The main source rocks of the upper submember of Sha 4 in Qingdong Sag have the evolutional characteristics of early generation and rapid discharge. There are many types of oil and gas reservoirs. The results show that they are controlled by the strike-slip of the Tanlu fault zone and are nearly east-west. The development of the three main faults in NW-NW and NNE-trending leads to the formation of a structural pattern of "graben barrier phase" in the north and south direction of the sag, and the structure of the depression is superimposed from the east to the west in the east-west direction. The main structural styles are extension, extension-strike-slip structural style, and the reverse structural style is only locally developed. The conversion rate of the source rocks on Sha 4 varies rapidly between 2 500 and 3 500 m, the range of hydrocarbon generation is relatively concentrated, and the hydrocarbon generation potential is large. South-to-north structure, interphase distribution of lithologic reservoir, EW-trending stratigraphy, tectonic-structure-lithology-lithology-structure oil and gas reservoir orderly distribution, the reservoir forming model is divided into steep slope multiple migration and accumulation, near source migration and accumulation accumulation in the middle uplift of the depression. Migration and accumulation of fault strike in slope zone and reservoir formation model in situ in depression.
【作者单位】：中国石化胜利油田勘探开发研究院;
【基金】：国家自然科学基金项目(41372107)
【分类号】：P618.13
【正文快照】： 青东凹陷位于济阳坳陷东部,郯庐断裂带西侧,为新生代残留型陆相断陷湖盆,整体呈北东走向的菱形[1].凹陷分为东部郯庐断裂带、中部洼陷带及西部斜坡带等二级构造单元,三级正向构造单元包括北部次凸、南部次凸、青东8次凸、青东12次凸及青东4断阶带,三级负向构造单元包括北次洼

【相似文献】