深层致密砂岩储层构造裂缝充填物特征及地质意义——以库车坳陷克深气田巴什基奇克组为例  

Filling characteristics and geological significance of tectonic fractures in deep sandstone reservoirs:A case study of the Bashijiqike Formation in Keshen gas field,Kuqa Depression

作　　者：罗威 LUO Wei(Beijing National Day School,Beijing 100039,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]北京市十一学校,北京100039 [2]中国科学院大学,北京100049

出　　处：《复杂油气藏》2025年第1期9-15,共7页Complex Hydrocarbon Reservoirs

摘　　要：构造裂缝是控制致密砂岩储层质量及产能的重要因素。基于薄片、成像测井、碳氧同位素以及流体包裹体等资料,分析库车坳陷巴什基奇克组致密砂岩储层构造裂缝充填特征与裂缝开启闭合过程,并在此基础上探讨构造体制下的流体-岩石相互作用过程及其对储层的影响,为致密砂岩气勘探开发提供理论依据。结果表明:研究区存在三期构造裂缝,形成时代越晚,裂缝充填度相对越低;裂缝中主要充填方解石、石英和硬石膏等胶结物,裂缝中多期次方解石胶结物和石英桥反映了构造裂缝开启闭合频繁;多期次裂缝能有效沟通上下地层,形成相对开放的流体系统,对改善储层有促进作用;也为认识深层储层形成机理提供新思路。Tectonic fractures is an important factor controlling the quality and productivity of tight sandstone reservoirs.Based on the date of thin section,imaging logging,carbon and oxygen isotopes,and fluid inclusions,we analyze the structural fracture infilling characteristics and the process of fracture opening and closing in the tight sandstone reservoir of the Bashijiqike Formation in the Kuqa Depression.On this basis,the fluid-rock interaction process under the structural system and its impact on the reservoir are explored to provide a theoretical basis for the exploration and development of tight sandstone gas.The results show that there are three periods of tectonic fractures in the study area.The later the formation age,the lower the relative infilling degree of the fracture.The fractures are mainly filled with dolomite,quartz,hard gypsum,and other cement.The multiple phases of calcite cement and quartz bridges in the fractures reflect frequent opening and closing of structural fractures,which effectively communicate with the upper and lower strata,and form a relatively open fluid system that is conducive to the improvement of the reservoirs and provides new insights into the formation mechanism of the deep reservoirs.

关 键 词：构造裂缝 致密砂岩 流体系统 石英桥 库车坳陷 

分 类 号：TE122[石油与天然气工程—油气勘探]