鄂尔多斯盆地子洲—佳县地区山西组测井相研究

Well Logging Facies Study of Shanxi Formation in Zizhou-Jiaxian Area,Ordos Basin

在子洲—佳县地区山西组测井响应基础之上,结合地质录井资料,对该区山西组不同岩相和沉积相电性进行了研究。研究结果表明:子洲—佳县地区山西组不同岩相和沉积相有不同的测井响应特征,深侧向视电阻率与自然伽马交汇图能较好的区分出山西组不同岩相;山西组山2段主要发育辫状河三角洲沉积相,山1段主要发育曲流河沉积相;沉积相在纵向上的分布及组合表明,从山西组沉积初期到后期,盆地基底古构造活动逐渐趋于稳定,在山2段沉积末期,研究区有一次明显湖平面上升。

The different lithofacies and sedimentary phase are studied in this paper based on well logging response of Shanxi Formation,combined with geological data,in Zizhou-Jiaxian area,Ordos Basin.Research results show that different lithofacies and sedimentary phase have different logging response characteristics in Shanxi Formation in Zizhou-Jiaxian area,Ordos Basin.Deep lateral apparent resistivity and gamma ray intersection graph can distinguish different lithofacies in Shanxi Formation.Section 2 of Shanxi Formation is mainly fluvial braided river delta deposition phase.Section 1 of Shanxi Formation is mainly meandering river deposition phase.Sedimentary facies in vertical distribution and combination show that the basin basement palaeo tectonic activity gradually stabilized from early deposition of Shanxi Formation to late.At the end of the Shan 2 Section deposition,the study area has a significant lake level rise.