鄂尔多斯盆地东部神木地区太原组微观储层特征及其产能影响因素分析  

Micropore structure and impact factors of the productivity of the Taiyuan Formation in Shenmu Area, eastern Ordos Basin

作　　者：彭磊[1] 石磊[1] 朱玉杰[1] 王建峰[1] 付国民[2] 高哲[1] 曹爱强 刘田 PENG Leil;SHI Lei;ZHU Yu-jie;WANG Jian-feng;FU Guo-min;GAO Zhe;CAO Ai-qiang;LIU Tian(PetroChina Changqing Oilfield Company,Xi'an 710018,China;School of Resources,Changan University,Xi'an 710054,China)

机构地区：[1]中国石油长庆油田公司,西安710018 [2]长安大学资源学院,西安710054

出　　处：《兰州大学学报（自然科学版）》2022年第4期451-457,464,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金重大项目(41390451);国家科技重大专项(2016ZX05050)。

摘　　要：为明确鄂尔多斯盆地东部神木地区上古生界下二叠统太原组气藏储层特征及产能影响因素,采用激光共聚焦扫描、恒速压汞、高压高温渗流实验等测试分析,通过与相邻高产气田储层对比,在微观储层特征研究的基础上,分析影响太原组储层低产的主控因素.结果表明,与盆地东部其他上古生界储层比较,神木地区太原组岩屑石英砂岩及岩屑砂岩是形成储层的主要岩石类型,软组分及杂基含量高,成分及结构成熟度较低;以次生溶孔为主要储集空间,呈丝状、针状、弯曲片状伊利石充填溶孔,严重地影响孔隙的连通性,而上覆山西组、石盒子组等储层以高成熟的石英砂岩为主,黏土杂基少,残余粒间孔发育,储层物性及孔隙结构相对较好;影响产能的地质因素主要有储层成分组成及微观孔隙结构较差、储层较强的敏感性与较低的原始含水饱和度导致的储层伤害、储层产水导致气相渗流能力急剧变差.To clarify the characteristics and impact factors of the productivity of the Taiyuan Formation of the Lower Permian of the Upper Palaeozoic gas reservoir in the Shenmu Area of the eastern Ordos Basin,we analyzed the main control factors that influence the low yield of the Taiyuan Formation reservoir via a comparison with the adjacent high-yield gas field reservoir and based on the micropore structure tested by the advanced testing and analysis of laser confocal scanning, constant speed pressure mercury, high pressure and high temperature seepage experiments and other advanced test analyses. The results showed that, compared with other Upper Paleozoic reservoirs in the eastern Ordos basin, the lithic quartz sandstone and lithic sandstone of the Taiyuan Formation in the Shenmu Area were of the main rock types for reservoir formation with a high content of soft components and miscellaneous bases, and low compositional and structural maturity;the primary storage space was secondary dissolved pores filled with filamentous, needle-like and curved illite, and it seriously affected the connectivity of pores. The reservoirs of the Shanxi Formation and Shihezi Formation were dominated by highly mature quartz sandstone with few clay impurities and developed residual intergranular pores, meaning that the physical properties and pore structure of the reservoirs of the Shanxi Formation and Shihezi Formation were relatively good. The geological factors affecting the productivity of the Taiyuan Formation reservoir mainly included poor reservoir composition and microscopic pore structure, reservoir damage caused by a strong reservoir sensitivity and low original water saturation, and sharp deterioration of gas flow ability caused by reservoir water production.

关 键 词：储层 敏感性 太原组 神木地区 鄂尔多斯盆地 

分 类 号：P618.13[天文地球—矿床学]