长庆油田王窑南地区延安组储层研究

发布时间：2018-03-01 08:30

  本文关键词： 王窑南 延安组 储层特征 孔隙结构 成岩作用　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：王窑南地区位于鄂尔多斯盆地伊陕斜坡带中南部,即安塞--延安一带。研究目的层延安组是一套陆源碎屑沉积,延8~10是主要的油层。截至目前,本区的勘探程度仍然较低。进行储层精细研究,查明延安组的沉积微相及砂体展布特征的关系,在此基础上开展储层预测,对该油田今后的有效开采具有重要指导意义。本论文综合各井取心段,铸体薄片分析,电镜扫描以及X光衍射和分井段测井曲线解释及评价等资料,详细研究了王窑南地区延安组储层的性质以及平面展布。研究结果表明延8~10油层组砂岩储层岩石类型主要为岩屑石英砂岩,长石石英砂岩,这些岩石经历了压实、胶结、溶解等作用,成岩作用处于早成岩至晚成岩A期;岩石成分成熟度中等偏高,结构成熟度中等;颗粒分选较好,圆度以次棱角~次圆状为主,孔隙类型以原生粒间孔、次生孔隙为主。母岩性质,沉积微相,压实作用,胶结作用,不稳定组分的蚀变作用,交代作用,溶解作用均对储层性能有重要影响。其中压实作用和胶结作用破坏了砂岩的原生孔隙结构;而溶解作用以及不稳定组分的蚀变作用形成了次生孔隙,改善了砂岩的孔隙结构。将研究区储层分为四大类,则延安组延8~10油层组砂岩储层多为Ⅱ类、Ⅲ类储层,其沉积微相为水上分流河道、水下分流河道、河口坝、席状砂等,优质含油储集体多出现在席状砂或分支河道发育部位。
[Abstract]:The Wangyonan area is located in the central and southern part of the Yishan slope belt in the Ordos Basin, that is, the Ansai-Yan'an area. The Yanan formation is a set of continental clastic deposits, and Yan8yao 10 is the main reservoir. The degree of exploration in this area is still low. The relationship between sedimentary microfacies and sand distribution characteristics of Yan'an formation is found out through fine reservoir study, and reservoir prediction is carried out on this basis. This paper synthesizes the data of coring section, casting thin section analysis, scanning electron microscope, X-ray diffraction and well logging curve interpretation and evaluation. The properties and plane distribution of Yan'an formation reservoir in Wangyaonan area are studied in detail. The results show that the sandstone reservoir rock types of Yan 810 reservoir are mainly lithic quartz sandstone and feldspar quartz sandstone, which have experienced compaction and cementation. The diagenesis is in the A stage from early diagenesis to late diagenesis; the composition maturity of rock is on the high side and the structure maturity is medium; the granulation is better, the roundness is mainly subangular to subcircular, and the pore type is primary intergranular pore. Secondary porosity dominated. Parent rock properties, sedimentary microfacies, compaction, cementation, alteration of unstable components, metasomatism, Among them, compaction and cementation destroy the primary pore structure of sandstone, while dissolution and alteration of unstable components form secondary pores. The pore structure of sandstone has been improved. The reservoir in the study area is divided into four categories. The sandstone reservoir of Yan'an formation Yan8yun10 reservoir is mostly of class 鈪，

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