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川东北马路背构造带须二段储层微观孔隙结构特征分析及评价
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Abstract:
致密砂岩储层的微观孔隙结构特征的分析及评价对勘探开发具有重要意义，目前国内对致密砂岩储层微观孔隙结构特征的研究相对较少。本文基于高压压汞实验，结合岩心描述和氩离子抛光扫描电镜对砂岩孔隙结构进行研究和探讨，同时对川东北地区须二段砂岩储集层空间进行分类。研究结果发现，川东北地区马路背构造带砂岩储层属于低孔、超低渗储层。同时，高压压汞实验进汞–退汞曲线结果显示目的层段砂岩储层主要以微孔和中孔为主，排驱压力平均值为1.33 MPa，定量结合高压压汞孔喉结构参数与扫描电镜评价储层质量，认为川东北地区马路背构造带砂岩类型主要为细砂岩，发育大量的裂缝和次生孔隙，属于裂缝–孔隙型储层，储层质量较好。本次研究为川东北地区储层评价及进一步勘探开发提供可靠的地质基础和理论依据。
The analysis and evaluation of the micro pore structure characteristics of tight sandstone re-servoir are of great significance for exploration and development. At present, there is relatively little research on the micro pore structure characteristics of tight sandstone reservoir in China. Based on high-pressure mercury injection experiment, combined with core description and argon ion polishing scanning electron microscope, this paper studies and discusses the pore structure of sandstone, and classifies the reservoir space of Xu2 member sandstone in Northeast Sichuan. The results show that the sandstone reservoir in Malubei structural belt in Northeast Sichuan belongs to low porosity and ultra-low permeability reservoir. At the same time, the results of mercury inlet and outlet curve of high-pressure mercury injection experiment show that the sandstone reservoir in the target section is mainly microporous and mesoporous, and the average displacement pressure is 1.33 MPa. The reservoir quality is evaluated quantitatively combined with the structural parameters of high-pressure mercury injection pore throat and scanning electron microscope. It is considered that the sandstone type of Malubei structural belt in Northeast Sichuan is mainly fine sandstone, with a large number of fractures and secondary pores. It belongs to fracture pore reservoir with good reservoir quality. This study provides a reliable geological and theoretical basis for reservoir evaluation and further exploration and development in Northeast Sichuan.
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