喇嘛甸油田北块萨零组储层沉积微相

喇嘛甸油田位于大庆长垣的最北端,是受构造控制的不对称的短轴背斜气顶油藏,萨零组位于萨尔图油层的顶部,属于下白垩统的嫩一段。根据取心井岩心描述、粒度分析、测井曲线特征,结合喇嘛甸油田沉积背景,对萨零组北块储层的沉积微相进行精细划分,进一步划分为水下分流河道、席状砂、表外储层微相,认为主要储层砂体为水下分流河道砂和席状砂。详细分析了沉积微相的平面展布特征,绘制沉积相带图。揭示了喇嘛甸油田的构造特征、沉积环境特征,确定了萨零组为三角洲外前缘沉积,为指导萨零组油气层的开发提供精细地质描述。

MICROFACIES OF SA-0 RESERVOIR IN NORTH BLOCK OF LAMADIAN OILFIELD

The Lamadian Oilfield is an asymmetric short axis anticlines reservoir with a gas cap under structural control, located at the north corner of the Daqing Placanticline. The Sa-0 reservoir occurs on the top of the Saertu oil layers, belonging to the 1st Member of the Nenjiang Formation of the Lower Cretaceous. Based on the cores, grain size, and well logging data, in combination with the sedimentary setting, three microfacies are well defined, e.i. subaqueous distributary channel microfacies; sheet-like sandbody microfucies and untabulated reservoirs. The main reservoirs consist of the distributary channel sands and sheet-like sandbodies. In this paper, we described the plane distribution of microfacies in sedimentary facies map, and revealed the tectonic characteristics and sedimentary environment while the Sa-0 reservoir was deposited. It was defined that the S-0 reservoir belongs to an external delta-front facies. The conclusion will help exploration in the region.