普光气田礁滩相储层特征及分类评价

The characteristics and classification evaluation of reef-shoal facies reservoir
in Puguang Gas Field

任杰 田永敏 王军 张纪喜 刘红磊 齐建强

中国石化中原油田分公司勘探开发研究院，河南 郑州 450000 中国石化中原油田分公司油气勘探管理部，河南 濮阳 457001

Exploration and Development Research Institute, Zhongyuan Oilfield Company, SINOPEC, Zhengzhou 450000, China Petrolume Exploration Management Department, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China

通过研究普光气田长兴组—飞仙关组礁滩相储层的岩心分析资料，明确了目的层段的岩性主要为残余鲕粒白云岩、生物礁白云岩等，分为基质孔、粒间溶孔和粒内溶孔3种孔隙空间类型。通过取心样品的压汞曲线特征聚类分析，将储层孔隙结构划分为4种类型。基于储层岩性特征、孔隙空间类型、物性特征及孔隙结构的差异，综合利用数理统计和模糊聚类分析方法，建立了普光气田礁滩相储层精细评价分类标准。研究表明：Ⅰ类、Ⅱ类储层孔喉连通性好、渗流能力强，相对易动用；Ⅲ类储层孔喉连通性较差，动用相对困难；Ⅳ类储层为非储层。据此划分的储层分类结果与产层关系更加密切，能够满足储层精细评价的需求，为气藏开发中后期的精细调整和剩余气挖潜奠定了基础。

Based on the core experimental analysis data of reef-shoal facies reservoir of Changxing-Feixianguan Formation in Puguang Gas Field, it is clear that the main lithologic types of the target interval are residual oolitic dolomite and biohermal dolomite, including three pore space types such as matrix pore, intergranular dissolved pore and intragranular dissolved pore. The reservoir pore structure is divided into four types by clustering mercury injection curve characteristics of coring sample. Based on the differences of reservoir lithology, pore space type, physical property characteristics and pore structure, the classification standard of fine evaluation of reef-shoal facies reservoir in Puguang Gas Field is established by using mathematical statistics method and fuzzy cluster analysis method. The results show that typeⅠandⅡreservoir has good pore-throat connectivity, strong seepage capacity and is relatively easy to develop; type Ⅲ reservoir has poor pore-throat connectivity and is relatively hard to develop; type Ⅳ reservoir is non-reservoir. The result of reservoir classification is more closely related to the production layer, which can meet the needs of fine reservoir evaluation and lay a foundation for fine adjustment of gas reservoir development and potential tapping of remaining gas in the middle and late stage of gas reservoir development.

10.6056/dkyqt202005007