天然气勘探与开发2025，Vol.48Issue(4)：27-40,14.DOI:10.12055/gaskk.issn.1673-3177.2025.04.003
准噶尔盆地石钱滩凹陷石炭系致密砂岩储层特征及主控因素
Characteristics and controlling factors of Carboniferous tight sandstone reservoirs in Shiqiantan Sag,Junggar Basin
摘要
Abstract
To clarify the characteristics and controlling factors of the Upper Carboniferous tight sandstone reservoirs in Shiqiantan Sag,eastern Junggar Basin,a systematic study was conducted by using analysis techniques such as cast thin section,scanning electron microscope(SEM),electron probe microanalyzer,X-ray diffraction(XRD),and fluid inclusion,together with the sequence stratigraphic framework and sedimentary facies analysis.Results show that(i)Shiqiantan Formation reservoirs are complex in rock types.The delta plain-front lithology mainly develops sandstone with relatively coarse grain size and relatively low content of impurities,with good physical properties.However,the littoral-neritic deposits exhibit a wide range of lithologies,mainly consisting of sandstones,bioclastic silty claystones and arenaceous bioclastic limestones,with fine grain size,complex composition,high carbonate content and poor physical properties;(ii)the main storage spaces of Shiqiantan Formation reservoirs are secondary dissolved pores(e.g.feldspathic/lithic intragranular dissolved pores and laumontite interstitial dissolved pores)and microfractures(e.g.structural fractures and dissolved fractures);(iii)Shiqiantan Formation reservoirs are significantly controlled by diagenesis.Specifically,compaction served as the primary driver to reduce porosity,cementation of various calcites played a critical role in destructing pores,and clay minerals like chlorite and illite-smectite mixed layer severely impeded the permeability regardless of their benefits for micropore development;and(iv)deep hydrothermal dissolution associated with tectonic activities has the most significant effect on improving reservoir properties.Secondary dissolved pores and structure-fracturing-induced micropores are configured to enhance the pore connectivity and the permeability,and sandstone reservoirs in synsedimentary facies belts near the faults show relatively good physical properties.In conclusion,the delta front coarse-grained sandstones and the hydrothermal-tectonic alternation zones are targets with high-quality reservoirs,and acidic fluids formed during hydrocarbon generation of source rocks and deep hydrothermal process jointly controlled the creation of secondary pores.关键词
准噶尔盆地东部/石炭系上统石钱滩组/致密砂岩/储层特征/成岩作用/热液溶蚀/次生孔隙Key words
Eastern Junggar Basin/Upper Carboniferous Shiqiantan Formation/Tight sandstone/Reservoir characteristic/Diagenesis/Hydrothermal dissolution/Secondary pore分类
能源科技引用本文复制引用
肖冬生,林潼,刘小洪,马强,杨润泽,李攀,曹娟..准噶尔盆地石钱滩凹陷石炭系致密砂岩储层特征及主控因素[J].天然气勘探与开发,2025,48(4):27-40,14.基金项目
中国石油股份有限公司"十四五"前瞻性基础性重大科技项目"不同类型大气田(区)成藏主控因素及领域评价"(编号:2021DJ0605). （区）
