喇嘛甸油田密井网砂质辫状河厚砂层单砂体识别

Identification of single sand body in thick sand layer of braided river under the condition of dense well pattern in Lamadian Oilfield

以大庆喇嘛甸油田葡Ⅰ组2_3小层(PⅠ2_3)厚砂层为研究对象,总结了砂质辫状河单砂体分布模式,并相应探索了一套密井网区单砂体识别方法。辫状河厚砂层由多期辫状河叠加而成,发育心滩坝和辫状水道砂体,以心滩坝砂体为主。依据单井泛滥平原细粒夹层垂向上对厚砂层进行期次划分对比,然后分别对每期辫状河连片砂体采用"单井识别、侧向划界、平面组合"的方法识别出单砂体。

Taking the P I 23 thick sand layer of Pu I Member in Lamadian Oilfield of Daqing as a case, the distribution pattern of single sand body in the sandy braided river was summarized and a set of identification methods for the single sand body in dense well pattern area were correspondingly created. The thick sand layer of braided river was superimposed by multi-phase braided rivers with mid-channel bar and braided channel sand development, which was dominated by mid-channel bar. Based on the fine-grained interlayer of flood plain in the single well, the thick sand layers were divided and correlated vertically according to the stages, and then the braided fiver each stage was identified from the contiguous sand body using the method of single well identification, boundary lateral division and plane combination.