鄂尔多斯盆地东南部山西组泥岩封盖性能评价

发布时间：2018-02-13 18:51

  本文关键词： 灰色理论 排替压力 孔隙度 渗透率 山西组 鄂尔多斯盆地东南部　出处：《吉林大学学报(地球科学版)》2017年04期 　论文类型：期刊论文

【摘要】：为弥补鄂尔多斯盆地东南部盖层的研究空白,借鉴已有研究成果与盖层基本特征,选取泥岩孔隙度、渗透率、厚度以及排替压力4个参数,结合灰色理论分析方法,对鄂尔多斯盆地东南部山西组泥岩盖层封盖性能进行了综合定量评价。结果表明:盆地东南部泥岩北东部较厚,整体呈从北向南减薄的趋势,南部孔隙度及渗透率均偏高;泥岩盖层排替压力较大,大于8 MPa的平面面积占70%以上;由灰色理论打分评价可知,山西组整体盖层封盖性能较好,封盖能力特强(Ⅰ类盖层)、封盖能力强(Ⅱ类盖层)的盖层分布区域广泛,Ⅰ类和Ⅱ类盖层主要发育于盆地北部、北东部,中部延长、延安、志丹等周边地区,盖层封盖性好,Ⅲ类盖层(封盖能力中等)、Ⅳ类盖层(封盖能力差)主要发育于南部。盖层发育较好的地区,经勘探开发与试气,单井日产量可达上万方,证明评价结果与勘探实践匹配。
[Abstract]:In order to make up for the blank in the study of caprock in the southeast of Ordos Basin, with reference to the existing research results and the basic characteristics of caprock, four parameters of mudstone porosity, permeability, thickness and displacement pressure are selected, and the grey theory analysis method is combined. The comprehensive quantitative evaluation of the seal property of the mudstone caprock of Shanxi formation in the southeast of Ordos Basin is carried out. The results show that the mudstone in the southeastern part of the basin is thicker in the north and east, the whole is thinning from north to south, and the porosity and permeability in the south are higher. The displacement pressure of mudstone caprock is larger than 8 MPa, the plane area is more than 70%, and the evaluation of grey theory indicates that the seal performance of the whole cap bed of Shanxi formation is better. The caprocks with strong capping ability (type 鈪，

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