巴西桑托斯盆地东部隆起带M地区白垩系火山机构类型及其油气地质意义  

Volcanic edifice types and their oil and gas geological significance in Cretaceous strata in M region in eastern uplift zone of Santos Basin,Brazil

作　　者：王国栋 刘畅[1,2] 冯玉辉 刘亚明[3] 阳孝法 WANG Guodong;LIU Chang;FENG Yuhui;LIU Yaming;YANG Xiaofa(College of Paleontology,Shenyang Normal University,Shenyang 110034,China;Key Lab of Evolution of Past Life in NE Asia,Ministry of Natural Resources(Shenyang Normal University),Shenyang 110034,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China)

机构地区：[1]沈阳师范大学古生物学院,沈阳110034 [2]自然资源部东北亚古生物演化重点实验室(沈阳师范大学),沈阳110034 [3]中国石油勘探开发研究院,北京100083

出　　处：《世界地质》2025年第1期82-93,共12页World Geology

基　　金：中国石油天然气股份有限公司重大科技专项(2023ZZ07)。

摘　　要：为了探究巴西桑托斯盆地东部隆起带M地区白垩系火山机构优质储层分布,笔者基于钻井取心、常规测井曲线、三维地震以及测井物性等资料,利用火山岩岩石学与火山地层学方法,对巴西桑托斯盆地东部隆起带M地区白垩系火山地层,开展火山岩岩性、岩相、期次、火山机构类型及其与储层关系研究。结果表明,M地区共识别出4种火山机构类型,包括陆上基性板状熔岩、陆上基性充填状熔岩、水下基性单一厚层熔岩与水下基性多期叠置熔岩火山机构;M地区火山喷发期次共划分为5期,期次2发育陆上基性板状熔岩火山机构,期次3发育水下基性单一厚层熔岩与水下基性多期叠置熔岩火山机构,期次4发育水下基性多期叠置熔岩火山机构,期次5发育陆上基性充填状熔岩火山机构;M地区4种火山机构的储层物性,水下基性多期叠置熔岩火山机构最好,水下基性单一厚层熔岩火山机构中等,陆上基性板状熔岩和陆上基性充填状熔岩两类火山机构最差。综合以上研究结果,认为M地区仅发育水下基性多期叠置熔岩火山机构的期次4储层最好,发育水下基性多期叠置熔岩和单一厚层熔岩两类火山机构的期次3储层较好,发育陆上基性板状熔岩和陆上基性充填状熔岩火山机构两类火山机构的期次2和期次5储层最差。因此,研究区期次3与期次4火山岩可作为后续油气勘探的重点靶区。In order to explore the distribution of high quality reservoirs within the Cretaceous volcanic edifice in the M region in the eastern uplift zone of the Santos Basin,Brazil,volcanic lithology,lithofacies,stages,types of edifice and their relationship with reservoirs were studied in the Cretaceous volcanic strata in the M region,based on the drilling cores,conventional logging curves,three-dimensional seismic data and logging physical properties,with the methods of volcanic petrology and volcanic stratigraphy.The results show that four types of volcanic edifice were identified in the M region,including onshore basaltic tabular lava edifice,onshore basaltic fill-type lava edifice,subaqueous basaltic thick-layer lava edifice,and subaqueous basaltic compound lava edifice.Furthermore,the volcanic rocks in the M region were divided into five eruption stages,of which eruption stage 2(E2)is characterized by the deposition of onshore basaltic tabular lava edifice,stage 3(E3)consists of the subaqueous basaltic thick-layer lava edifice and subaqueous basaltic compound lava edifice,stage 4(E4)comprises merely subaqueous basaltic compound lava edifice,and stage 5(E5)is composed of onshore basaltic fill-type lava edifice.Additionally,the reservoir physical properties vary among four types of volcanic edifices,with the subaqueous basaltic compound lava edifice exhibiting the best properties,subaqueous basaltic thick-layer lava edifice being moderate,and the onshore basaltic tabular lava edifice and onshore basaltic fill-type lava edifice demonstrating the worst properties.Based on these findings,it is considered that in the M region,the reservoir associated with E4 featuring subaqueous basaltic compound lava edifice is the best,the reservoir of E3 comprising subaqueous basaltic thick-layer lava edifice and subaqueous basaltic compound lava edifice ranks second,the reservoirs of E2 and E5 which involve onshore basaltic tabular lava edifice and onshore basaltic fill-type lava edifice are considered the least favorable.Therefore,v

关 键 词：火山机构 喷发期次 白垩系 东部隆起带 桑托斯盆地 巴西 

分 类 号：P618.13[天文地球—矿床学]