Determination of Lacustrine Palaeoshore Line and Its Controls on the High Quality Reservoir: A case from the 8 th member of Shihezi Formation in North Ordos Basin
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摘要: 古湖岸线是历史时期湖平面与古陆地的交线,是陆上和水下沉积的分界线。确定古湖岸线的位置对于油气勘探起着重要的指导作用。在利用泥岩颜色、泥岩X衍射分析以及自然伽马曲线特征等常规湖岸线识别方法的基础上,从有机岩石学分析的全新角度认识研究区盒8段沉积环境,确定了盒8期古湖岸线具体位置及湖岸线摆动区。沉积盆地中古湖岸线控制了优质储集层的形成与发育,由于砂岩粒度、软岩屑含量、填隙物组成的差异以及后期成岩作用导致水上沉积带砂岩物性要优于岸线摆动沉积带和水下沉积带砂岩。Abstract: Lacustrine palaeoshore line is the intersection position between the lake level and the ancient land in geologic time, and the boundary between the onshore deposits and the subaqueous deposits. Determining the location of lacustrine palaeoshore line has important guide on exploration of oil and gas. In this paper, by the means of conventional mudstone color, mudstone X-ray diffraction analysis, GR curve characteristics, and organic petrology analysis, the location and swing area of lacustrine palaeoshore line of He 8 has been studied. The lacustrine palaeoshore line in the sedimentary basin controls the formation and development of the high quality reservoir. The physical properties of sandstones from sedimentary belt above water are better than those from shoreline swing band and underwater sedimentary belt sandstones because of the difference of sandstone size, soft lithoclast content, composition of interstitial material and diagenesis.
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