鄂尔多斯盆地延长气区上古生界砂岩孔隙结构

Reseach on the shandstone pore structure of Upperer Paleozoic at Yanchang Gas Field in Ordos Basin

目的探讨鄂尔多斯盆地上古生界砂岩孔隙结构特点和油气储集的关系。方法对井下剖面砂岩的储集层分析资料进行精细研究。结果鄂尔多斯盆地上古生界砂岩的储集层孔隙结构特征表现为物性条件差,孔隙类型多为次生孔隙,毛管压力曲线排躯压力较高,孔隙分选较差,具有天然气聚集的基本地质条件。结论鄂尔多斯盆地上古生界砂岩具有较好的天然气聚集条件,是目前天然气藏聚集的主要场所。

Aim To probe relationship between the shandstone pore structure cracterrastic of Upperer Paleozoic and hyzrocarbon accumulation in Orduos Basin. Methods Combining mainly geochemical data of the reservoir with different bore specimens,the reservoir revolution are set for excellent base. Results Reservoir among the standstones, such as reservoir physical chractreistics are worse, types of pore are second pores, expulsion pressure of sandstone capillary curves are higer and worse sorting with pores at Permian sandstone reservoir atc that are probed in which shandstone pore structure have basic geological conditions. Conclusion By means of bore specimens and log analysis it has better conditions for oil accumulations which are important sites of shandstone of Upperer Paleozoic at Yanchang Gas Field in Ordos Basin, in which evaluations on Shanxi formation and Xiashihezi formaton have been made.