鄂尔多斯盆地东南部二叠系物源分析

近几年鄂尔多斯盆地东南部上古生界陆续发现新的天然气区带，显示出巨大的勘探潜力，因此对盆地东南部二叠系物源的研究对于确定储集砂体展布规律具有重要价值。以钻测井、岩心及周边露头资料为基础，通过露头剖面古流向测定、重矿物分析、边缘相分析、相带分析的方法，确定了研究区二叠系的物源方向；研究认为鄂尔多斯盆地东南部二叠系山西组与石盒子组物源可分为北北东、北北西及南部三个方向，以延安为中心区域属于汇水区；山2段南部物源影响范围较大，影响到延安以北区域；盒8段北部物源范围较大，越过了延安，相应的南部物源范围后撤。

Study on Provenance of the Permian in southeast Ordos basin

Recent years lots of new gas plays are found continuously in the Upper Paleozoic in southeast Ordos basin, which displays great exploration prospects. Therefore, the study on Provenance of the Permian in southeast Ordos basin is of great importance to confine reservoir distribution rules. Based on data of well drilling, logging and core as long with outcrop sections of surroundings, the provenance directions of the Permian are confined by means of paleo-current direction measuring in outcrop sections, heavy mineral analyzing, and marginal facies diagnosing as well as facies belt construing. The study shows that the provenance of Shanxi and Shehezi Formation of the Permian in southeast Ordos basin can be divided into three directions which are NNE, NNE, and south, while Yanan region being the center of water catchment; The influence area of southern provenance is bigger in Shan-2 member which influenced areas of north of Yanan; The influence area of northern provenance is bigger in He-8 member which overreached areas of south of Yanan while the southern provenance receded simultaneously.