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大凌河油层是辽河坳陷欢2-14-16区块的主力含油层系之一。研究表明,大凌河油层是裂谷深陷期深水环境条件下形成的一套浊流沉积物,沉积物具有多期性和突变性,主要岩性以中—细砾岩和岩屑质混合砂岩为主,次为含砾砂岩,砂体在平面上受水道控制明显,呈北西向的条带状展布。根据古地理和古构造条件,以及岩石成分、结构、构造、砂体发育及分布特征,认为辽河坳陷欢2-14-16区块大凌河油层的沉积环境主要是具供给水道的缓坡型湖底扇中扇亚相,由辫状沟道、辫状沟道间、中扇前缘微相组成。
The Dalinghe reservoir is one of the main oil-bearing strata in Huan 2-14-16 block in the Liaohe Depression. The study shows that the Dalinghe reservoir is a set of turbidite sediments formed in the deep rivulet of rift deep depression. The sediments are multi-period and abrupt. The main lithology is the mixture of medium-fine conglomerate and cuttings The sandstone is the dominant type, and the secondary is the pebbly sandstone. The sand body is obviously controlled by the waterway in the plane and exhibits a northwest stripe distribution. According to paleogeography and palaeostructure conditions, rock composition, structure, structure, sand body development and distribution, it is considered that the depositional environment of Dalinghe reservoir in Huan 2-14-16 block of Liaohe depression is mainly of gentle slope type with water supply channel Fan sub-fan in the sublacustrine fan, composed of braided channel, braided channel, fan front micro-phase composition.