渤中19-6气田变质岩潜山储层基岩渗透率计算方法

Calculation Method of Permeability of Metamorphic Reservoir in Bozhong 19-6 Gas Field

渤中19-6气田是渤海湾盆地最近发现的规模最大的变质岩潜山凝析气藏,储集空间主要为碎裂粒间孔、溶蚀孔、溶蚀缝与构造缝,导致流体流动过程中呈现明显的双重孔隙介质特征。在分析研究区储集空间类型和测井响应特征基础上,基于双重孔隙介质储层试井解释方法构建了渤中19-6气田变质岩潜山储层基岩渗透率计算模型,并针对D井进行了应用。结果表明:D井储层渗透率约为0.0247 mD,为典型低渗储层,试井特征曲线具有明显的双重孔隙介质的下凹特征,储能比为0.34,显示探测区域内储层的储集能力一般,窜流系数为6.8×10-6,基质系统渗透率为2.76×10-6mD。研究结果对渤中19-6井区试井设计及产能预测有一定借鉴意义。

Bozhong 19-6 reservoir is the largest metamorphic buried hill condensate gas reservoir recently discovered in the Bohai Bay basin. The reservoir space is mainly composed of cataclastic intergranular pores,dissolution pores, dissolution fractures and structural fractures, which results in obvious dual porous media characteristics in the process of fluid flow.Based on the analysis of reservoir space types and logging response characteristics in the study area, this paper constructs a calculation model of bedrock permeability and applies it to well D. The results show that the reservoir permeability of well D is about 0.0247 md, which is a typical low-permeability reservoir. The well test characteristic curve has obvious concave characteristics of dual porous media, and the channeling coefficient is 6.8×10-6, matrix system permeability is 2.76×10-6m D. The research results have certain reference significance for well test design and productivity prediction in Bozhong19-6 well block.