李越哲，梁兵，夏连军，张昊，张娟，范立新，叶琳. 高邮凹陷陡坡带戴南组一段储层物性特征及控制因素[J].河南理工大学学报(自然科学版), doi: 10.16186/j.cnki.1673-9787.2024090021.

LI Y Z，LIANG B，XIA L J，ZHANG H，ZHANG J，FAN L X，YE L. Physical property characteristics and controlling factors of the first member of the Dainan Formation in the steep slope zone of the Gaoyou Sag [J]. Journal of Henan Polytechnic University( Natural Science), doi: 10.16186/j.cnki.1673-9787.2024090021.

高邮凹陷陡坡带戴南组一段储层物性特征及控制因素(网络首发)

李越哲 ^1，2，梁兵 ¹，夏连军 ¹，张昊 ¹，张娟 ¹，范立新 ¹，叶琳 ²

（1. 中国石化江苏油田分公司，江苏 扬州 225009；2. 长江大学 地球科学学院，湖北 武汉 430100）

摘要: 目的 为了探讨断陷湖盆转换初期碎屑岩储层演化及发育规律。方法 选取苏北盆地高邮凹陷始新统戴南组一段南部陡坡带真武-曹庄、许庄、邵伯等地区的43口井的岩心、测录井资料，通过岩心及薄片镜下观察描述以及粉末粒度、扫描电镜SEM、压汞等实验技术，利用储集层压实减少孔隙度COPL、胶结减少孔隙度CEPL等参数分析，结合断陷型盆地构造特征及沉积演化特征，对戴南组一段各亚段储层岩石学、物性、结构特征差异进行分析，并阐明优质储集层的沉积成因，及影响储层质量差异及非均质的主控因素。结果 陡坡带戴南组一段岩石组分相似，以长石岩屑质石英砂岩为主，平均石英含量差别不大，其岩屑类型以火成岩和变质岩为主，不同时期、区带岩性略有差别。且各亚段储层性质存在较明显差异，表现出E₂d₁²储层性质略好于上覆和下伏地层，孔隙度与渗透率平均值分别为14.16%和33.8×10^-3μm²。各亚段储层孔隙都以原生粒间孔、粒内溶孔、粒间溶孔为主，减孔机制主要以压实作用为主，胶结作用是次要机制影响相对较小。结论 受转换期构造演化影响的沉积作用，以及成岩作用是造成E₂d₁²储层较好的因素之一，该时期扇三角洲前缘沉积分布范围最广，砂岩结构成熟度与成分成熟度相对较高，抗压实能力较强，且碳酸盐胶结物溶蚀作用强烈，形成大量次生孔隙，改善其储层物性。

关键词: 高邮凹陷；E₂d₁；储层特征；非均质性；储层成因

中图分类号：TE122.1　　

doi: 10.16186/j.cnki.1673-9787.2024090021

基金项目: 国家自然科学基金资助项目（41402111）；中石化江苏油田分公司博士后基金项目（JD23003）

收稿日期：2024-9-11

修回日期：2024-11-27

网络首发日期：2025-07-19

2024-11-27Physical property characteristics and controlling factors of the first member of the Dainan Formation in the steep slope zone of the Gaoyou Sag (Online)

Li Yuezhe ^1，2，Liang Bing ¹，Xia Lianjun ¹，Zhang Hao ¹，Zhang Juan ¹，

Fan Lixin ¹，Ye Lin ²

（1. Jiangsu Oilfield Company, SINOPEC, Yangzhou 225009,Jiangsu, China；2. School of Geosciences, Yangtze University, Wuhan 430100, Hubei,China）

Abstract: Objectives In order to explore the evolution and development laws of the clastic rock reservoir of the first member of the Dainan Formation during the period of lake basin conversion from the faulted-depression to faulted type in the early stage of the faulted basin. Methods The core and logging data of 43 wells in Zhenwu-Caozhuang, Xuzhuang and Shaobo areas in the southern steep slope of the first member of Eocene Dainan Formation in Gaoyou Sag of Subei Basin were selected. Through core and microscope observation and description, powder particle size, scanning electron microscope SEM, mercury injection and other experimental techniques, reservoir compaction to reduce porosity COPL, cementation to reduce porosity CEPL and other parameters analysis, combined with the tectonic characteristics and sedimentary evolution characteristics of fault-type basin, the differences in petrology, physical properties and structural characteristics of E₂d₁ reservoir are analyzed. The sedimentary genesis of high-quality reservoirs and the main controlling factors affecting the quality difference and heterogeneity of reservoirs are also expounded. Results The lithology of different sub-members is similar, mainly feldspathic lithic quartz sandstone, the average quartz content is not significantly different, and its rock debris types are mainly igneous and metamorphic rocks, with slight differences in lithology in different periods and zones. The reservoir properties of each sub-member are obviously different, showing that the reservoir properties of the middle E₂d₁² sub-member are slightly better than those of the overlying and underlying strata. The average values of porosity and permeability are 14.16 % and 33.8×10^-3 μm², respectively. The reservoir pores are mainly composed of primary intergranular pores, intragranular dissolved pores, and intergranular dissolved pores. The pore reduction mechanism is mainly due to compaction, and cementation is a relatively minor mechanism. Conclusions The sedimentation affected by the tectonic evolution of the transition period and diagenesis are one of the better factors for the E₂d₁² reservoir. During this period, the sedimentary distribution of the fan delta front is the most extensive. The sandstone structure maturity and composition maturity are relatively high, and the anti-compaction ability is strong. The dissolution of carbonate cements is strong, forming a large number of secondary pores and improving their reservoir properties.

Key words：Gaoyou depression; E₂d₁; reservoir characteristics; heterogeneity; reservoir genesis

CLC: TE122.1