鄂尔多斯盆地郭旗地区长6砂体叠加样式研究

Study on Superposition Pattern of Chang 6 Sandbody in Guoqi Area of Ordos Basin

砂体叠加样式研究可从微观上分析砂体纵向、横向上的发育特征,进而明确储层垂向和平面变化规律及油藏发育特征。通过鄂尔多斯盆地郭旗地区延长组长6砂体的沉积环境、沉积微相、岩性、沉积构造及测井资料的研究,以及对沉积相和储集砂体的结构特征的讨论,建立郭旗地区长6砂体的叠加样式。研究表明,长6水下分流河道砂体内部构型模式主要分为前积体、前积层两种;砂体的横向叠加因两个砂体之间的接触程度由多到少可以分为替代式、侧切式两种类型,砂体的垂向叠加在基准旋回面升降的不同时期,形成叠加样式叠加、切叠式叠加两种不同的沉积层序与砂体叠加样式。分析认为,郭旗地区长6砂体的平面展布特征和砂体叠加样式对认识长6油藏具有重要的实践意义。

Study of sandbody superposition pattern analyzed the development characteristics of vertically and laterally, and cleared the reservoir vertical changes regularly and development characteristics. Based on the study of sedimentary environments, sedimentary microfacies, lithology, sedimentary structures and logging data of Chang 6 sandbody in Qilicun oilfield, especially the sedimentary facies and the structure characteristics of sandstone sand- body, Chang 6 was established sandbody superimposed pattern. The results showed that the superimposed pattern of the sandbody in the study area can be divided into the former product body and the former product layer, the hori- zontal superposition divided into alternative and side-cut basis on the degree of contact between two sandbo,vertical superposition divided into overlay and cut -lap superposition pattern by different times during the baseline cycle. It was of great practical significance to analyze the sand distribution characteristics of sandbody and the superimposed pattern of sand bodies in Qilieun oilfield.