摘要
利用岩心及薄片分析、核磁共振、微米CT测试、层序格架下的等时追踪及古地貌恢复等方法,对阿联酋西部地区白垩系森诺曼阶高孔渗灰岩的沉积特征、层序及沉积演化特征和成岩作用进行了系统剖析,从构造-沉积-成岩多维度对高孔渗储层的控制因素进行了研究。研究结果表明:①阿联酋西部地区森诺曼阶高孔渗灰岩储层主要分布于Mishrif组,岩性主要为亮晶厚壳蛤灰岩、亮晶生屑灰岩和泥晶生屑灰岩,储集空间主要为体腔孔、铸模孔和粒间溶孔;Mishrif组整体为碳酸盐岩缓坡沉积,可识别出内缓坡、中缓坡和外缓坡3类沉积亚相,厚壳蛤礁、高能滩、滩前、滩后、滩间及潟湖等6个微相;高孔渗储层主要发育于厚壳蛤礁微相和高能滩微相,其中,厚壳蛤礁微相优质储层孔隙度为20%~34%,渗透率为150~2000 mD,高能滩微相优质储层孔隙度为25%~33%,渗透率为40~370 mD。②研究区Mishrif组自下而上可分为3个三级层序SQ1—SQ3,可细分为7个体系域,SQ1—SQ2层序主要由高位体系域构成,厚壳蛤礁微相和高能滩微相规模较大;SQ3层序由高位体系域和海侵体系域构成,古地貌高部位发育高能滩微相且物性更好。③研究区Mishrif组高孔渗储层的孔隙发育受多期成岩作用叠合改造,包括以同生期大气淡水溶蚀为主的建设性成岩作用和与烃类充注相关的保持性成岩作用。④研究区Mishrif组高孔渗储层受沉积相、层序格架、古地貌格局以及成岩改造作用等多重因素控制;储层物性具有明显的相控特征,而沉积微相的分布与演化在Mishrif组沉积早—中期(SQ1—SQ2)受控于三级层序内部高位体系域旋回,在沉积晚期(SQ3)则受继承性古地貌影响。
By using methods such as core and thin section analysis,nuclear magnetic resonance and micro-CT testing,isochronous tracing under sequence framework and paleogeomorphic restoration,a systematic analysis was conducted on the sedimentary characteristics,sequence,sedimentary evolution characteristics and diagenesis of high porosity and permeability limestone reservoirs of Cretaceous Cenomanian in the western United Arab Emirates,and the controlling factors of high porosity and permeability reservoirs were studied from the aspects of structure,sedimentation and diagenesis.The results show that:(1)The high porosity and permeability limestone reservoirs of Cenomanian in the western United Arab Emirates are mainly developed in Mishrif Formation,with the lithologies mainly consisting of sparite rudist limestone,sparite bioclastic limestone,and micrite bioclastic limestone.The reservoirs space is mainly composed of biological cavities,moldic pores and intergranular dissolved pores.The Mishrif Formation is generally characterized by carbonate ramp sedimentation,three types of subfacies including inner ramp,middle ramp and outer ramp,and six types of microfacies including rudistid reefs,high-energy shoals,front/back shoals and inter-shoals,lagoons can be identified.High porosity and permeability reservoirs are mainly developed in rudistid reefs and high-energy shoals.The porosity and permeability of limestone reservoirs in rudistid reefs are 20%-34%and 150-2000 mD,respectively,while the porosity and permeability of limestone reservoirs in high-energy shoals are 25%-33%and 40-370 mD,respectively.(2)From bottom to top,the Mishrif Formation in the study area can be divided into three third-order sequences SQ1-SQ3 and seven systems tracts.The SQ1-SQ2 sequences are mainly composed of highstand systems tract,with rudistid reefs and high-energy shoals broadly developed.The SQ3 sequence is composed of highstand systems tract and transgressive systems tract,with high-energy shoals well developed in high parts of ancient landform and
作者
罗贝维
尹继全
胡广成
陈华
康敬程
肖萌
朱秋影
段海岗
LUO Beiwei;YIN Jiquan;HU Guangcheng;CHEN Hua;KANG Jingcheng;XIAO Meng;ZHU Qiuying;DUAN Haigang(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;China National Oil and Gas Exploration and Development Corporation,Beijing 100034,China)
出处
《岩性油气藏》
CAS
CSCD
北大核心
2023年第6期63-71,共9页
Lithologic Reservoirs
基金
国家自然科学基金项目“特提斯演化控制下的油气差异富集机理与勘探领域”(编号:92255302)
中国石油天然气股份有限公司科学研究与技术开发项目“海外复杂碳酸盐岩精细勘探关键技术研究”(编号:2021DJ3104)联合资助。
关键词
高孔渗灰岩储层
碳酸盐岩缓坡
厚壳蛤礁
高能滩
相控
层序地层
古地貌
大气淡水溶蚀
森诺曼阶灰岩
Mishrif组
白垩系
阿联酋西部
high porosity and permeability limestone reservoir
carbonate ramp
rudistid reef
high-energy shoal
facies control
sequence stratigraphy
paleogeomorphology
atmospheric freshwater dissolution
Cenomanian limestone
Mishrif Formation
Cretaceous
the western United Arab Emirates
