双坨子气田泉头组第一段沉积微相及储集物性特征

Research on sedimentary microfacies of Member 1 of Lower Cretaceous Quantou Formation in Shuangtuozi gas field of Songliao Basin and reservoir physical property

松辽盆地双坨子气田下白垩统泉头组第一段为主力产气层段,发育曲流河和辫状河沉积体系。利用岩石相与测井相转换技术对其沉积微相进行了划分与对比,进一步识别出边滩、心滩、决口扇、河道滞留、天然堤和泛滥平原等沉积微相,并对其沉积微相平面展布特征进行了研究,为砂体空间分布预测和三维储层属性建模提供了重要依据。砂体展布受控于沉积微相,结合物性资料统计分析,认为边滩砂体是研究区曲流河沉积中最有利的储集相带,心滩砂体是辫状河沉积中最有利的储集相带。

Member 1 of the Lower Cretaceous Quantou Formation is the principal section of the Shuangtuozi gas field located in the Songliao Basin. There develops the meandering river deposition system and braided river deposition system. By using the petrofacies and electrofacies switching technology, the authors divide and compare the sedimentary microfacies of Member 1 of Quantou Formation in the study area, and therefore further recognize the sedimentary microfacies, such as marginal bank, point bat, crevasse splay, channel lag, natural levee, bet lands, etc.. Also, they study the planar distribution characteristics of the sedimentary microfacies so as to provide significant evidences for forecasting sandbody space distribution and 3-D reservoiring modeling. According to statistic analysis of physical property materials, and under the control of sedimentary microfacies, the marginal bank sandbody is the most benificial reservoir belt in the meandering river deposition system of the study area, and the batture sandbody is that in the braided river depositional system of the study area.