基于流动单元的砂砾岩储层渗透率测井精细评价

doi:10.13278/j.cnki.jjuese.201601306

摘要/Abstract

摘要：

随着南海西部海域的勘探与开发,越来越多的砂砾岩油气藏被发现。但由于研究区域砂砾岩储层孔隙结构复杂,因此,孔隙度基本相同的储层之间渗透率差别很大,并且低渗砂砾岩储层的油水层测井响应特征不明显。针对于此,本文深入分析砂砾岩储层的孔隙结构特征及其对储集层电性的影响,总结不同沉积环境条件下渗透率的分布特征及影响因素。从宏观上看:受近物源的控制,快速堆积的碎屑杂基充填孔隙,储层渗透率表现为低渗特征;由于溶蚀作用改善了孔隙,远物源孔隙连通性较好,渗透率表现为中高渗特征;而压实作用较为强烈的储层则表现为特低渗特征。从微观上看,岩石平均孔喉半径是渗透率的重要内在控制因素。依据不同的沉积环境及孔隙结构特征,采用流动单元分析法,将砂砾岩储层细分为三大类,从而建立了三大类砂砾岩储层渗透率测井解释模型;并采用最能表征储层储集性能的补偿密度、补偿中子、泥质体积分数、地层流动带指数进行模糊聚类分析,得到Fisher线性判别模型。结果显示,流动单元法所建渗透率模型最终预测渗透率相对误差基本保持在50%以内,比传统孔渗模型方法精度更高,在研究区域更具有适用性和准确性。

关键词: 砂砾岩, 孔隙结构, 物源, 流动单元, 渗透率测井解释, 北部湾盆地

Abstract:

With the exploration and exploitation in western Southern Sea, there are an increasing number of conglomerate reservoirs being found. In the conglomerate reservoirs of the study area, the pore structure is complicated, permeability varies greatly among reservoirs of basically equal porosity, and the response in logging to oil-water layers is not obvious in hypotonic conglomerate reservoirs. Facing these issues, the authors analyze the pore structure characteristics and its influence on reservoir electricity, and generalize the permeability distribution and other factors in different sedimentary environments. Regionally, closed to its provenance, the quickly piled debris heteroaryl fills the pores, and this results in the low permeability of the reservoir; While far away from the provenance, the pores are improved by dissolution effect, yielding a good pore connectivity and permeability unless the reservoirs suffered strong compaction. Microscopically, pore-throat radius of rock determines permeability to some extent. According to different sedimentary environments and pore structure characteristics, by use of flow unit analysis, the conglomerate reservoirs are divided into three types. The reservoir performance factors, including compensated density, compensated neutron, mud content and lay flow index, are used for ambiguous clustering analysis to get the Fisher linear discrimination model so as to set up the logging interpretation model for three main kinds of conglomerate reservoirs. The permeability model built by the flow unit method is more accurate than that by conventional methods, and also more practical in the areas of interest.

Key words: sand conglomerate, pore structure, provenance, flow unit, permeability log interpretation, Beibuwan basin

中图分类号:

P631.8

郑香伟, 吴健, 何胜林, 胡向阳, 梁玉楠. 基于流动单元的砂砾岩储层渗透率测井精细评价[J]. 吉林大学学报(地球科学版), 2016, 46(1): 286-294.

Zheng Xiangwei, Wu Jian, He Shenglin, Hu Xiangyang, Liang Yunan. Fine Evaluation of Permeability of Conglomerate Reservoir Based on Flow Unit[J]. Journal of Jilin University(Earth Science Edition), 2016, 46(1): 286-294.

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