陈家庄地区馆陶组高分辨率层序地层分析及沉积微相研究

Analysis of high-resolution sequence stratigraphy and sedimentary microfacies of Guantao formation in Chenjiazhuang area

为了搞清陈家庄地区馆陶组沉积微相特征及含气层位,从岩心观察入手,利用岩心资料识别了陈家庄地区馆陶组短期旋回,建立了岩电关系模板,在此基础上,利用大量的测井资料,根据短期旋回在测井曲线上的响应,识别了中期旋回并进行了横向对比,建立了高分辨率层序地层格架。研究结果表明,陈家庄地区馆陶组发育4个中期旋回16个短期旋回,旋回叠加样式主要有退积式、加积式。对该层序地层格架内不同准层序沉积相平面分布及其随时间的变化特征分析认为,陈家庄地区馆陶组沉积体系从早至晚经历了冲积扇辫状河沉积、辫状河广泛发育期和辫状河向曲流河演化3个阶段。

In order to clarify the sedimentary microfacies characteristics and gas-bearing interval of Guantao formation in Chenjiazhuang area, short-term cycles were identified by core observation data, and the template between lithology and electrical property was established. According to the logging curve response of short-term cycles, by intermediate-term cycles identification and transverse contrast, a high-resolution sequence stratigraphic framework was obtained with well logging data. The results show that Guantao formation can be divided into four intermediate-term cycles and sixteen short-term cycles, and the overlying cycle mainly contains retrogradation and accretion. Based on the stratigraphic framework, sedimentary facies variation with time and plane distribution in different subsequences were figured out. The region went through three stages of sedimentary facies evolvement, that is, alluvial-braided river sedimentary, braided river extensive development and evolvement from braided river to meandering river system?