【摘要】 本文从长岭凹陷隐蔽油气藏勘探实际出发,以分析该区的油气地质条件、控砂主导因素及油气成藏规律为主线,利用钻井、地震等资料通过地震属性分析、测井约束反演等方法对该区进行了储层预测,寻找有利的储层分布范围,研究砂体在空间展布特征,掌握砂体与断层的配置关系、砂体的尖灭情况,进而识别不同类型隐蔽型圈闭.指出该区隐蔽油气藏主要有三种成藏类型,即构造-岩性复合型、砂岩上倾尖灭型、砂岩透镜体型.远物源缓坡河流-三角洲沉积体系控制该区砂体分布,使得油气富集成藏规律主要表现为多层位含油,各个砂组交互发育;单个油藏面积小,在平面上具有多套砂体形成迭合连片的特征.主要目的层,如青一、二段砂体,以三角洲前缘分支河道发育为主,河道走向北东向.研究区内的断层走向近南东—北西向,与砂体走向垂直.这种断层与砂体配置关系,易形成构造-岩性复合圈闭.更多还原

【Abstract】 As the south part of Songliao Basin,Changlin depression have abundant resource of oil and gas.At present,Changlin depression have already been developed.The depression have many layers of oil and gas accumulation,which have many different types of accumulations.It is those good geological conditions that was favourable to development of complex accumulation of oil and gas.This paper will report the development regularity of oil and gas accumulation in Changlin Depression,and analyze log and seismic data by seismic attribution and log-restrict inversion to forcast reservoir in the depression,in order to find distribution characteristic of advantageous reservoir and sandstone bodies,and to understand the relationship between sandstone body and faults,vanished character of sandstone body and identify the closure of lithological character.The results show that,characteristic of oil and gas accumulation mainly have three types of closure,such as complex strcuture-lithological closure,upper-dip tail-out closure of sandstone body and len closure of sandstone body.The development regularity of oil and gas accumulation mainly is multi-layer of oil and gas and mutual effect of those sandstone groups.And,single accumulation have too small area,but widely distributed as sheet in the horizontal plane.Multi-sandstone-body in the accumulation have vertical connexity.The main objective-layer,such as sandstone layers in Qing-I and Qing-II formation,have main characteristic of delta front watercourse,which is north-eastern trend.And,faults in this area have nearly south-eastern to north-western strike,which is perpendicular to those sandstone bodies.Those relationship easily result in the development of the complex closure of structure-lithology.更多还原