三塘湖盆地芦草沟组储层微观特征与致密机理

发布时间：2018-01-31 18:36

  本文关键词： 致密储层 致密机理 成岩作用 芦草沟组 马朗-条湖凹陷 三塘湖盆地　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：为了研究三塘湖盆地马朗-条湖凹陷芦草沟组的油气聚集规律,并为下一步优选勘探目标提供科学的依据,本文在研究芦草沟组致密储层微观特征的基础上,同时考虑成岩作用和成岩阶段对储层物性的影响,探讨了储层的致密机理。研究结果表明,芦草沟组致密储层粒度较细,分选性差,泥质、杂基含量高,孔隙结构具有纳米孔、特低渗、纳米喉、不均匀型的特征。成岩作用对储层物性具有明显的控制作用,早成岩阶段的储层渗透率较好,从高渗到超低渗均有;中成岩阶段储层的渗透率较差,非渗储层(渗透率0.1mD)激增;在中成岩阶段A1亚期,还发育特低渗的常规储层(渗透率≥1mD),但在中成岩阶段A21-A22微期,绝大多数为渗透率0.1mD的非常规储层。芦草沟组致密储层中沉积物的特征具有沉积型致密储层的特征,但孔隙类型以次生孔为主,也符合成岩型致密储层的特征。因此,芦草沟组致密储层的致密原因属于混合成因,但以沉积成因为主。
[Abstract]:In order to study the oil and gas accumulation law of Lucaogou formation in Marang-Tiaohu depression of Santanghu Basin and to provide scientific basis for the next optimal exploration target, this paper studies the microscopic characteristics of dense reservoir in Lucaogou formation. Considering the influence of diagenesis and diagenesis on reservoir physical properties, the mechanism of reservoir densification is discussed. The results show that the tight reservoir of Luchaogou formation has fine granularity, poor sorting, muddy and high heterogeneity content. The pore structure has the characteristics of nano-pore, ultra-low permeability, nano-larynx and heterogeneity. Diagenesis has obvious controlling effect on reservoir physical properties, and the reservoir permeability in early diagenesis stage is better, from high permeability to ultra-low permeability. In the middle diagenetic stage, the permeability of the reservoir is poor, and the permeability of the non-permeable reservoir (permeability 0.1mD) increases rapidly. During the A1 substage of the middle diagenetic stage, conventional reservoirs with extremely low permeability (permeability 鈮，

本文编号：1479724