东海盆地西湖凹陷潜山基岩储层岩相特征及主控因素分析  

Lithofacies Characteristics and Main Controlling Factors of Buried Hill Reservoir in Xihu Sag,East China Sea Basin

作　　者：何玉春 张国栋 蔡军 曲长伟 李伸专 吴金龙 陈艳艳 HE Yuchun;ZHANG Guodong;CAI Jun;QU Changwei;LI Shenzhuan;WU Jinlong;CHEN Yanyan(Shanghai Branch,CNOOC(China)Limited Company,Shanghai 200335,China;Schlumberger Company(China),Beijing 100015,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335 [2]斯伦贝谢中国公司,北京100015

出　　处：《西安石油大学学报(自然科学版)》2025年第2期23-32,共10页Journal of Xi’an Shiyou University(Natural Science Edition)

基　　金：中海石油(中国)集团公司十四五重大科技项目“基于录测井资料的有利岩性-岩相判别技术研究”(CCL2022SHPS011EM)。

摘　　要：东海盆地西湖凹陷潜山基岩储层蕴含着丰富的油气资源,为了精细表征东海盆地西湖凹陷中生界潜山储层裂缝及次生溶蚀的发育情况并探讨裂缝及次生溶蚀在三维空间内的延展性,结合钻井取心、井壁取心、录井及高分辨率测井资料对潜山储层岩相进行精细划分,并首次综合三维远场声波成像技术定量描绘裂缝及次生溶蚀的横向延展性,分析研究区潜山储层的成因模式。结果表明,西湖凹陷中生界潜山储层岩相可细分为5种类型:开启型裂缝相、泥质填充裂缝相、裂缝-溶蚀相、溶蚀相和致密相,其中开启型裂缝相和溶蚀相是研究区潜山储层主要的油气储集类型。三维远场声波成像测井资料表明开启型裂缝相延展最远,可达距离井筒7 m范围;其次为裂缝-溶蚀相,延展至井筒外约5 m范围;泥质填充裂缝相、溶蚀相及致密相三维空间内延展规模有限,仅在井周附近有所发育。岩性、构造活动及溶蚀改造作用共同控制了研究区潜山储层的形成,是研究区潜山储层形成的主要控制因素。高分辨率测井技术及三维远场声波成像测井资料的综合利用实现了对研究区潜山储层裂缝及次生溶蚀的综合评价,为后续潜山基岩储层勘探开发提供了强有力的数据支撑。There are abundant oil and gas resources in the buried hill reservoirs in the Xihu Sag of the East China Sea Basin.In order to finely characterize the development of fractures and secondary dissolution in the Mesozoic buried hill reservoirs in the Xihu Sag of the East China Sea Basin and explore the extension of fractures and secondary dissolution in three-dimensional space,the lithology of the buried hill reservoirs was finely divided based on drilling coring,wellbore coring,logging,and high-resolution logging data.The lateral extension of fractures and secondary dissolution is quantitatively depicted using three-dimension far-field acoustic imaging technology,and the genetic mode of the buried hill reservoirs in the study area is analyzed.The results indicate that the Mesozoic buried hill reservoirs can be subdivided into five lithofacies:open fracture facies,mud filled fracture facies,fracture-dissolution facies,dissolution facies,and tight facies.Among them,open fracture facies and dissolution facies are the main oil and gas storage types of the buried hill reservoirs in the study area.The three-dimensional far-field acoustic imaging logging data shows that the open fracture facies extends the farthest,up to a distance of 7 m from the wellbore;Next is the fracture-dissolution facies,which extends to a range of about 5 m outside the wellbore;The three-dimensional extension scale of the mud-filled fracture facies,dissolution facies and tight facies is limited,and only develops near the wellbore.Lithology,tectonic activity and dissolution jointly control the formation of the buried hill reservoirs in the study area,which are the main controlling factors for the formation of the buried hill reservoirs in the study area.The comprehensive utilization of high-resolution logging technology and three-dimensional far-field acoustic imaging logging data has achieved a comprehensive evaluation of fractures and secondary dissolution in the study area's buried hill reservoirs,providing strong data support for subsequent ex

关 键 词：潜山储层 成像测井 声波测井 三维远场声波成像 储层岩相 西湖凹陷 

分 类 号：TE132[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]