鄂尔多斯盆地永宁南长8致密油主控因素分析及有利区预测

发布时间：2018-09-19 17:13

【摘要】：鄂尔多斯盆地永宁南长8油层组是延长油田致密油勘探的重点区域,对该区构造、烃源岩、储层、沉积相等进行分析,讨论致密油成藏主控因素并预测有利勘探区域。结果表明,西倾单斜背景上发育的低幅度构造对致密油成藏影响不大,但东西向展布的鼻状隆起可与砂体有机配置形成良好的岩性圈闭。巨厚的、优质的烃源岩是长8致密油成藏的基础。尽管致密油成藏对储层孔隙度、渗透率要求不高,但该区出油井储层孔隙度一般大于6.0%,渗透率一般大于0.1m D,表明物性对致密油成藏具有一定影响。水下分流河道中的厚层砂体是致密油富集的主要场所,也是研究区致密油成藏主控因素。根据成藏要素分析预测3个有利区,指导下一步勘探。
[Abstract]:The Nanchang 8 formation in Yongning, Ordos Basin, is the key area for the exploration of dense oil in Yanchang Oilfield. The structure, source rock, reservoir and sediment of this area are analyzed, the main controlling factors of tight oil reservoir formation are discussed and the favorable exploration area is predicted. The results show that the low amplitude structure developed in the westward monoclinal background has little effect on the formation of dense oil reservoir, but the nasal uplift with east-west distribution can form a good lithologic trap with the organic configuration of the sand body. Extremely thick and high-quality source rocks are the basis for the formation of Chang 8 dense oil reservoirs. Although the reservoir porosity and permeability requirement of tight oil reservoir is not high, the porosity and permeability of oil well reservoir in this area are generally greater than 6.0 and 0.1m D, which indicates that physical properties have certain influence on tight oil reservoir formation. The thick sand body in the underwater distributary channel is the main place of dense oil enrichment and the main controlling factor of dense oil accumulation in the study area. Three favorable areas are predicted based on the analysis of reservoir forming elements to guide further exploration.
【作者单位】：延长油田股份有限公司永宁采油厂;
【分类号】：P618.13

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