渤海锦州A构造古近系地震储层预测研究

Study on paleogene reservoir prediction of Jinzhou A structure in Bohai

渤海锦州A构造古近系东营组二段(E3d2)从上至下分为东二上段(E3d2u)和东二下段(E3d2L),其中东二下段(E3d2L)一油组为辫状河三角洲前缘沉积,地震剖面上广泛发育叠瓦状前积反射特征。首先通过地震相分析、古地貌恢复、分频技术及正演模拟等分析了前积反射的成因,认为该前积反射的形成主要反映了间歇型辫状河三角洲前缘席状砂顺斜坡方向的前积作用,是由多个砂体沿着物源方向前积、叠置和迁移所形成的。在此基础上,基于新三维地震资料,结合地震多属性综合分析、砂地比拟合等开展储层预测,对前积砂体的平面展布特征进行刻画,最终对锦州A构造东二下段储层有利发育区做出预测,为该构造的油气勘探评价提供了有利的借鉴。

Member two of Dongying formation of Paleogene can be divided into two lithologic segments, the upper part（E3d2） and the lower part（E3d2） fromtop tobottom in Jinzhou Astructure. The tirst ol braided river delta front,where the characteristics of imbricated foreset reflections is very obvioly ,the origin of the progradational reflection s analyzed by seismic facies analysis, the recovery of the ancient landform,thespectral decomposition technique and the forward modeling. This concludes that the progradational reflection shows prograda-tion action of sheet sand stones of the intermittent braided river delta front along the direction of slope and is composed of pro-gradation, superposition and lateral migration of multiple thin sand bodies along the direction of proveervoir prediction is carried out by multiple seismic attributes comprehensive analysis and sand seismic data and the later distribution characteristics of the foreset sand bodies is described. Finally this paper forecasts the fa-vorable development zone of the reservoir in the lower part of member two of Dongying formation which provides a favorable target for oil - gas exploration and evaluation of the structure.