鄂尔多斯盆地城华地区延长组长3油层组沉积储层特征研究

发布时间：2018-06-21 01:21

  本文选题：鄂尔多斯盆地 + 城华地区　； 参考：《成都理工大学》2017年硕士论文

【摘要】：本学位论文以鄂尔多斯盆地城华地区延长组长3油层组为研究对象,以当前沉积学和石油地质学领域先进的理论方法和技术手段为指导,充分利用钻井岩心观察资料、薄片鉴定、扫描电镜等测试分析手段,对该区沉积相特征、储层特征及成岩作用进行了深入分析。研究分析认为研究区长3沉积物源来自东北和西南的古河流,东北方向的河流三角洲发育明显,主要发育三角洲的前缘沉积。普遍认为前缘砂体发育的有利相带主要是水下分流河道与河口坝,砂体沉积厚度受沉积相带的控制,即三角洲前缘的水下分流河道砂体为研究区主要储层砂体,呈明显的叠置分布。镜下薄片观察表明,储层中岩屑长石砂岩和长石岩屑砂岩是最主要的岩石组分,以细砂岩为主,分选较好,主要的孔隙类型是原生粒间孔,长石溶孔和岩屑溶孔普遍存在。对研究区的成岩作用进行了精细的研究,长期而稳定存在的压实(压溶)作用、胶结作用,局部地区存在溶蚀作用和交代作用。在孔隙演化的过程中,压实作用和碳酸盐岩的胶结作用使孔隙度降低,降低了储层的储集能力。尽管溶蚀作用能使砂岩孔隙度有所增大,增强了砂岩的孔渗性,但因为碳酸盐发育有限,所以溶蚀作用不足以增强储集能力。研究区成岩阶段的划分表明该区整体上处于中成岩阶段A-B期。孔渗数据分析表明,研究区储层主要是低孔低渗储层。孔隙度介于10%~12%之间,渗透率介于0.1×10-3μm2~0.5×10-3μm2之间,孔连通性中等。压汞实验曲线表明,长3的压汞特征为高斜率,近似平台型,作为低孔低渗储层,前景比较好。在上述研究基础上,对储层进行了综合评价。长33主要发育Ⅰ、Ⅱ类储层储层,长32、长31主要发育Ⅱ类和Ⅲ类储层,说明长33储层品质整体高于长32、长31。为该区下一步油气勘探开发的提供了有利目标。
[Abstract]:This dissertation takes Yanchang formation No. 3 in Chenghua area, Ordos Basin, as the research object, and takes the advanced theoretical methods and technical means in the field of sedimentology and petroleum geology as the guidance to make full use of drilling core observation data. The characteristics of sedimentary facies, reservoir and diagenesis in this area are analyzed by means of thin slice identification and scanning electron microscope. It is considered that the source of Chang 3 sediment in the study area is from the ancient rivers in the northeast and southwest, and the river delta in the northeast direction is obviously developed, and the delta front sediments are mainly developed. It is generally considered that the favorable facies zones for the development of the front sand bodies are mainly underwater distributary channels and estuarine dams, and the thickness of the sand bodies is controlled by the sedimentary facies belts, that is, the underwater distributary channel sandbodies in the delta front are the main reservoir sandbodies in the study area. There is obvious overlay distribution. The microscopic observation shows that lithic feldspathic sandstone and feldspar lithic sandstone are the most important rock components in the reservoir, with fine sandstone as the main component and good separation. The main pore types are primary intergranular pores, feldspar dissolution pores and lithic dissolution pores are common. The diagenesis in the study area is studied in detail. The long-term and stable compaction (pressure solution), cementation, and local dissolution and metasomatism are studied. In the process of pore evolution, compaction and cementation of carbonate rock decrease porosity and decrease reservoir capacity. Although the dissolution can increase the porosity of sandstone and enhance the porosity and permeability of sandstone the dissolution is not sufficient to enhance the reservoir capacity because of the limited development of carbonate. The division of diagenetic stage in the study area indicates that the area is in the A-B stage of the middle diagenetic stage. The analysis of pore and permeability data shows that the reservoir in the study area is mainly low porosity and low permeability. The porosity is between 10% and 12%, the permeability is between 0.1 脳 10-3 渭 m ~ (-2) and 0.5 脳 10 ~ (-3) 渭 m ~ (2), and the porosity is moderate. The experimental curves of mercury injection show that the mercury injection of Chang 3 is characterized by high slope and is similar to platform type. As a low porosity and low permeability reservoir, it has a good prospect. On the basis of the above research, a comprehensive evaluation of the reservoir is carried out. Chang33 mainly developed 鈪，

本文编号：2046530