摘要
基于钻井、录井、岩心、地震及成像测井等资料,针对北部湾盆地涠西南凹陷一、二号断裂带石炭系潜山负反转构造识别及其演化过程开展系统研究,分析负反转构造对优质储层的控制作用。研究表明:(1)涠西南凹陷二号断裂带历经海西晚期—喜马拉雅期多期挤压、拉张应力场转换,石炭系潜山发育显著负反转构造。(2)海西期沉积的碳酸盐岩奠定优质储层的物质基础,负反转构造主要通过3方面控制古潜山优质储层发育:促使裂缝规模发育以扩大储集空间和改造油气运移通道;控制地层差异剥蚀以筛选出有利于后期储层改造的优势岩性;塑造古地貌高地,为表生岩溶作用提供有利条件。(3)负反转构造通过“裂缝网络构建-地层剥蚀筛选-多期岩溶改造”的耦合作用,形成表生溶蚀缝洞与埋藏扩溶体系协同发育的优质复合储集空间。研究成果用于指导勘探实践,在北部湾盆地碳酸盐岩潜山实现首口探井日产油超过1 000 m^(3)的重大突破,为涠西南凹陷石炭系潜山增储上产提供了地质依据。
Based on drilling,mud logging,core,seismic and imaging logging data,this paper studies the identification and evolution process of negative inversion structures in the Carboniferous buried hills in the No.1 and No.2 fault zones of Weixinan Sag,Beibu Gulf Basin,and reveals the controls of these structures on high-quality reservoirs.The No.2 fault zone develops significant negative inversion structures in the Carboniferous buried hills,as a result of multi-stage transformations of compressive–tensile stress fields in the period from the late Hercynian to the Himalayan.The Hercynian carbonates laid the material basis for the formation of high-quality reservoirs.The negative inversion structures mainly control the development of high-quality reservoirs in buried hills through:(1)creating large-scale fractures to increase reservoir space and improve oil-gas flow pathways;(2)regulating stratigraphic differential denudation to highlight dominant lithology for later reservoir transformation;(3)shaping the paleogeomorphological highlands to provide favorable conditions for superficial karstification.The negative inversion structures form a high-quality,composite reservoir space with the synergistic existence of superficial dissolution fractures/cavities and burial-enhanced karst systems through the coupling of fracture network creation,formation denudation screening and multi-stage karst transformation.The research results have guided the breakthrough of the first exploratory well with a daily oil production over 1000 m3 in carbonate buried-hill reservoir in the Beibu Gulf Basin,and provide referential geological basis for finding more reserves and achieving higher production in the Carboniferous buried hills in the Weixinan Sag.
作者
范彩伟
谢兵
徐昉昊
李明
徐国盛
周刚
张喜淳
李安然
FAN Caiwei;XIE Bing;XU Fanghao;LI Ming;XU Guosheng;ZHOU Gang;ZHANG Xichun;LI Anran(Zhanjiang Branch,CNOOC China Company Limited,Guangdong 524057,China;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China)
出处
《石油勘探与开发》
北大核心
2025年第5期997-1006,共10页
Petroleum Exploration and Development
基金
海南省科技专项资助(ZDYF2025GXJS013)
中海石油(中国)有限公司湛江分公司项目(CCL2023ZJFN0540)。
关键词
北部湾盆地
涠西南凹陷
石炭系
古潜山
负反转构造
优质储层
岩溶作用
缝洞型储层
勘探突破
Beibu Gulf Basin
Weixinan Sag
Carboniferous
buried hill
negative inversion structure
high-quality reservoirs
karstification
fractured-vuggy reservoir
exploration breakthrough
