Based on the present situation of hard to judge the sedimentary hiatal surface in ultra thick seam,in order to more accurately and reliably judge the sedimentary hiatal surface in ultra thick seam,taking the No.4 ultra thick coal seam in Yan'an Formation of Binchang Coalfield of Ordos Basin as an example,the logging data analysis,coal petrography and coal quality analysis,stable carbon isotope analysis of organic matter,1D continuous wavelet transformation as well as Milankovitch Cycle discriminate were applied to make a study on the comprehensive distinguishment of the sedimentary hiatal surface in ultra thick seam and the control factors of the cross section development.A set of methods to quantitatively distinguish the sedimentary hiatal surface in the ultra thick seam was provided.Research results showed that,the hiatal surfaces identified by different discriminant methods were assignment,weighted and scoring,the control factor of the hiatal surfaces was eccentricity,found out by Milankovitch Cycles,which could make the discriminant results of the hiatal surfaces in ultra thick coal seam more quantitative and more reliability.On those circumstances,a genetic mode of the sedimentaryhiatal surface in ultra thick seam in onshore zone was preliminarily summarized.%基于巨厚煤层沉积间断面识别困难的现状,为了更加准确、可靠地识别巨厚煤层的沉积间断面,以鄂尔多斯盆地彬长煤田延安组4号巨厚煤层为例,采用测井数据分析、煤岩煤质分析、有机质稳定碳同位素分析、一维连续小波变换以及米兰科维奇旋回识别方法,开展巨厚煤层沉积间断面的综合判别和间断面发育的控制因素研究,提出了一套定量判别巨厚煤层沉积间断面的方法体系.研究结果表明:对不同判别方法识别出的间断面予以赋值、加权和计分,并通过米兰科维奇旋回识别查明了沉积间断面发育的控制因素——偏心率,这使得巨厚煤层内部间断面的判别结果更加定量化和更具可靠性.据此,初步提出了滨岸带原地堆积巨厚煤层内部沉积间断面的成因模式.
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