| 渤中19-6孔店组砂砾岩孔隙结构和渗透率估算模型 |
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| 引用本文： | 宋晨,杨兵,张超谟,朱博远,张占松.渤中19-6孔店组砂砾岩孔隙结构和渗透率估算模型[J].地质科技通报,2023,42(1):274-285. |
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| 作者姓名： | 宋晨 杨兵 张超谟 朱博远 张占松 |
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| 作者单位： | 1.长江大学油气资源与勘探技术教育部重点实验室，武汉 430100 |
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| 基金项目： | 国家科技重大专项2017ZX05032-003-005 |
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| 摘 要： | 渤中19-6砂砾岩孔隙结构复杂，为提高渗透率的估算精度，需要从孔隙结构入手，找到与渗透率相关性最好的孔隙结构因素。以43块孔店组砂砾岩的孔隙结构和渗透率为研究对象，利用岩石铸体薄片确定发育的孔隙类型，通过高压压汞获取孔喉分布特征和孔隙结构参数。结合孔隙类型和孔隙结构参数分析孔隙结构和渗透率的关系，建立了基于孔隙结构参数的渗透率评价模型。研究表明，不同类型溶蚀孔隙的孔隙结构存在差异，粒内溶孔的孔隙结构最好，胶结物溶孔的孔隙结构最差。溶蚀孔隙类型发育不同，物性差异较大，以粒内溶孔为主且不发育胶结物溶孔的岩样物性最好。不同孔隙结构因素对渗透率控制程度不一致，其中基于孔喉大小、连通、配比和几何形状这4种因素建立的渗透率模型精度最高。渤中19-6气田孔店组砂砾岩粒内溶孔具有较大的孔喉半径和较好的连通性是促使该类岩石储集和渗流能力均较好的主要原因。平均孔喉半径、退汞效率、平均孔喉体积比和分形维数适用于估算孔隙结构复杂且(特)低孔渗的砂砾岩储层渗透率，以期为渤海湾盆地渤中凹陷砂砾岩储层的渗透率评价提供技术支持。
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| 关 键 词： | 孔隙结构 渗透率 孔隙结构参数 高压压汞 砂砾岩 渤中19-6 |
| 收稿时间： | 2021-08-12 |
Investigation of pore structure and permeability estimation models of Kongdian Formation glutenites in the Bozhong 19-6 Gasfield |
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| Affiliation: | 1.Key Laboratory of Exploration Technologies for Oil and Gas Resources of Ministry of Education, Yangtze University, Wuhan 430100, China2.No.1 Gas Production Plant of Sinopec North China Oil and Gas Company, Zhengzhou 450006, China |
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| Abstract: | The pore structure of glutenite in Bozhong 19-6 Gasfield is complicated. In order to improve the estimation accuracy of permeability, it is necessary to start with the pore structure and find the pore structure factor with the best correlation with permeability. Taking the pore structure and permeability of 43 Kongdian Formation glutenites as the research object, using rock casting thin slices to determine the pore types, and obtaining pore-throat size distribution characteristics and pore structure parameters through high-pressure mercury intrusion. Combining pore types and pore structure parameters to analyze the relationship between pore structure and permeability, a permeability evaluation model based on pore structure parameters was established. Studies have shown that there are differences in the pore structure between different types of dissolved pores. The pore structure of dissolved pores in the grain is the best, and the pore structure of dissolved pores in the cement is the worst. The physical properties of glutenite with different types of dissolution pores vary greatly. The rock samples with intragranular dissolution pores and no cement dissolution pores have the best physical properties. Different pore structure factors have inconsistent degrees of permeability control. Among them, the permeability model which based on pore throat size, connectivity, ratio and shape has the highest accuracy. The large pore throat radius and good connectivity of the dissolved pores in the glutenite grains of the Kongdian Formation of BZ19-6 Gasfield are the main reasons for the good reservoir and seepage capacity of this kind of rocks. The average pore throat radius, mercury removal efficiency, average pore throat volume ratio and fractal dimension are suitable for estimating the permeability of glutenite reservoirs with complex pore structures and (extremely) low porosity and permeability, in order to provide technical support for the permeability evaluation of glutenite reservoirs inBozhong Depression, Bohai Bay Basin. |
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