| 徐欣,薛纯琦,黄荣宾.致密砂岩储层孔喉结构特征及其控制因素——以鄂尔多斯盆地华庆地区长 63为例[J].矿产勘查,2025,16(7):1589-1598 |
| 致密砂岩储层孔喉结构特征及其控制因素——以鄂尔多斯盆地华庆地区长 63为例 |
| Pore and throat characteristics and main control factors of tight sandstone reservoir of Chang 63 of Huaqing Area in Ordos Basin |
| 投稿时间：2024-10-31 |
| DOI：10.20008/j.kckc.202507003 |
| 中文关键词: 储层特征 微观孔喉结构 产能 控制因素 华庆地区 |
| 英文关键词: reservoir characteristics micro pore and throat characteristics yield main control factors Huaq-ing Area |
| 基金项目:本文受陕西省教育厅科学研究计划项目(23JK0336)、陕西交通职业技术学院校级项目(YJ23005)和陕西省自然科学基础研究计划项目(2024JC-YBQN-0609)联合资助。 |
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| 中文摘要: |
| 为研究华庆地区长 63致密砂岩储层微观孔喉特征，本文通过铸体薄片、扫描电镜、压汞等对储层微观孔喉结构特征进行研究。表明:①研究区发育岩屑长石砂岩和长石砂岩，粒间孔和长石溶孔较为发育，喉道类型包括孔隙缩小型、缩颈型、片状和管束状；②按孔隙结构特征将其分为Ⅰ—Ⅳ类，Ⅰ类具有大孔大喉的特征，孔渗较好，连通性较强，Ⅳ类孔喉较小，连通性差；③每类孔隙结构对应不同的产能特征，Ⅰ类代表的储层开采过程中具有较高的产能和较低的含水率，Ⅳ类孔隙结构代表的储层不具有开采价值；④矿物成分与成岩作用共同影响了微观孔喉结构，黏土矿物对孔喉结构具有破坏作用，压实和胶结作用不利于孔隙结构的发育，而溶蚀作用对其改善具有促进作用。该研究可为甜点区预测提供地质依据。 |
| 英文摘要: |
| In order to study the micro pore and throat characteristics of Chang 63 tight sandstone reservoir inHuaqing Area, casting thin sections are identified, scanning electron microscopy are observed, high-pressure mer-cury injection and constant velocity mercury injection tests are carried out to analyze the basic types and character-istics of the reservoir. It is concluded that: ①Lithic arkose and arkose are developed in Huaqing Area, and the pore types are mainly intergranular pores and feldspar dissolved pores, throat types mainly include pore shrinkage, neck-ing, flaky and tube bundle; ② According to the characteristics of pore structure, it is divided into I, II, III and IV,and its properties become worse in turn. Type I has the characteristics of large pore and large throat, good pore per-meability and strong pore throat connectivity, but Type IV pore structure is poor, small pore throat and poor connec-tivity; ③ Each type of pore structure corresponds to different productivity characteristics. Reservoir with Type Ipore structure has high productivity and low water content in the mining process, but the reservoir with type IV porestructure has no mining value; ④ Mineral composition and diagenesis jointly affect the micro pore and throat char-acteristics. Clay minerals have destructive effect on pore structure as a whole. Compaction and cementation are notconducive to the development of dominant pore structure, while dissolution can promote the improvement of porestructure. This study will provide geological evidence for the prediction of the sweet spot area. |
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