天然气工业2023，Vol.43Issue(12)：25-36,12.DOI:10.3787/j.issn.1000-0976.2023.12.003
松辽盆地南部长岭断陷蚀变火山碎屑岩储层质量评价
Quality evaluation of altered volcaniclastic rock reservoirs in the Changling fault depression of the southern Songliao Basin
摘要
Abstract
Alteration is common in volcaniclastic rocks,and it has a direct effect on the quantitative characterization and accurate evaluation of the capacity of volcaniclastic rock reservoirs.Taking the volcaniclastic rocks of the Lower Cretaceous Huoshiling Formation in the Changling fault depression of southern Songliao Basin as the research object,this paper determines reservoir lithology,analyzes microscopic reservoir characteristics and clarifies the main reservoir alteration types by means of core observation,thin section analysis and scanning electron microscopy.Then,the lithology identification cross plot is established on the basis of logging curve,and the alteration index calculation method is developed to quantitatively identify the degree of reservoir alteration.Finally,reservoir quality is comprehensively evaluated and classified based on reservoir quality factor.And the following research results are obtained.First,the main alteration types of volcaniclastic rocks in the study area include vitroclastic devitrification alteration,feldspar dissolution alteration and clay alteration,among which,clay alteration has a great impact on the logging response and identification of reservoirs while devitrification alteration and dissolution alteration play a constructive role in increasing porosity.Clay alteration can not only form clay mineral intercrystalline pores,but also block the original pores.And with the increase of the alteration degree,the porosity increases first and then decreases.Second,the logging response of volcaniclastic rock reservoirs is affected greatly by alteration,and natural gamma,resistivity,acoustic travel time,density,compensation neutron and elemental logging curves are sensitive to clay alteration.The alteration index can be determined by conventional curves and elemental logging,so as to realize quantitative identification of the degree of reservoir alteration.Third,the volcaniclastic rock reservoirs in the study area can be classified into three types.Type Ⅰ reservoir is mainly composed of coarse-grained crystal lithic tuff,and is characterized by stronger secondary dissolution of albite,weaker clay alteration and low alteration index.Type Ⅱ reservoir is lithologically dominated by medium-grained crystal lithic tuff,and is characterized by medium degree of clay alteration and low alteration index.Type Ⅲ reservoir is composed of fine-grained mud-bearing tuff and very fine grained argillaceous tuff,and is characterized by strong clay alteration and high alteration index关键词
火山碎屑岩/蚀变指数/测井响应特征/储层质量评价/松辽盆地/下白垩统/火石岭组Key words
Volcaniclastic rock/Alteration index/Logging response characteristics/Reservoir quality evaluation/Songliao Basin/Lower Cretaceous/Huoshiling引用本文复制引用
钟高明,石磊,赵向原,毛永强,李永刚,郭宇航,吴冷,郑天龙..松辽盆地南部长岭断陷蚀变火山碎屑岩储层质量评价[J].天然气工业,2023,43(12):25-36,12.基金项目
中国石油化工股份有限公司重点科技项目"松南断陷火山岩气藏一体化技术研究与应用"(编号:P21104). （编号:P21104）
