西安石油大学学报（自然科学版）2024，Vol.39Issue(5)：59-70,12.DOI:10.3969/j.issn.1673-064X.2024.05.008
川西北中泥盆统观雾山组储层特征及其主控因素
Reservoir Characteristics and Main Control Factors of Middle Devonian Guanwushan Formation in Northwest Sichuan
摘要
Abstract
The reservoir characteristics and main controlling factors of the Guanwushan Formation in northwestern Sichuan were ana-lyzed by means of field profile and core observation,casting thin section identification,scanning electron microscopy,cathodolumines-cence,micrometer CT scanning,and porosity,permeability and geochemical characteristic testing.The results show that the reservoir of the Guanwushan Formation in northwestern Sichuan is mainly composed of biogenicreef dolomite,bioclastic dolomite and brecciated fine-medium crystalline dolomite.The storage space of the reservoir is mainly composed of biological cavities,intergranular pores and dissolution pores.Its average porosity is 2.58％,and the average permeability is 0.71 × 10-3 μm2.The development of the reservoir is mainly controlled by sedimentary facies,dolomitization and karstification.The platform edge reefs and high-energy tidal flats within the platform are favorable facies zones for reservoir development.The orderliness,cathodolum inescence,strontium isotopes,and rare earth element characteristics indicate that the dolomitization in the syngenetic to quasi-syngenetic period is the foundation for the formation of the reservoir,and the quasi-synchronous dissolution controlled by high-frequency sedimentary cycles and the surface karstification con-trolled by tectonic uplift are the key to the formation of the reservoir.The acidic fluids released by the maturation of hydrocarbons in the burial diagenesis stage improved the reservoir.关键词
川西北地区/中泥盆统/观雾山组/储层特征/主控因素/四川盆地Key words
northwest Sichuan/middle Devonian/Guanwushan Formation/reservoir characteristics/main controlling factor/Sichuan Basin分类
能源科技引用本文复制引用
徐康,汪远征,蒋小琼,王东,王海军,黄思钦,宫晗凝..川西北中泥盆统观雾山组储层特征及其主控因素[J].西安石油大学学报（自然科学版）,2024,39(5):59-70,12.基金项目
中石化科技部项目"龙门山前海相上组合油气成藏条件与区带评价"(P22073) （P22073）
中石化科技部项目"四川盆地下三叠统成藏条件与有利区带评价"(P21042-5) （P21042-5）
