深水峡谷上游复合浊积砂岩储层类型及其展布规律——以琼东南盆地中央峡谷陵水气田为例  

Types and distribution patterns of complex turbidite sandstone reservoirs in the upper reaches of deep-water canyons-A case study of the Lingshui gas field in the Central Canyon of Qiongdongnan Basin

作　　者：付超 谢玉洪 赵雨初 王晖 苑志旺 徐伟 陈国宁 FU Chao;XIE Yuhong;ZHAO Yuchu;WANG Hui;YUAN Zhiwang;XU Wei;CHEN Guoning(Research Institute Co.Ltd.,CNOOC,Beijing 100028,China;CNOOC Ltd.,Beijing 100010,China;School of Instrument Science and Engineering,Southeast University,Nanjing,Jiangsu 211189,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028 [2]中海油有限责任公司,北京100010 [3]东南大学仪器科学与工程学院,江苏南京211189

出　　处：《石油与天然气地质》2024年第2期516-529,共14页Oil & Gas Geology

基　　金：中国博士后面上基金项目(2022M723532);中国博士后科学基金项目(2023T160728)。

摘　　要：琼东南盆地陵水气田位于中央峡谷上游,以浊积砂岩储层为主,受沉积和成岩作用共同影响,储层类型较为多样,表征难度较大。为了预测深水甜点区分布,依据峡谷形态和埋深规律,将峡谷上游区域沿浊流流向依次划分为调整段、顺直段和弯曲段;通过综合井筒中粒度、孔喉结构和填隙物类型对储层进行分类;基于岩石组构和物性参数间定量关系,分析对应沉积储层的沉积成因。研究认为,峡谷调整段以粗粒重力流沉积为主,随着颗粒间杂基含量降低,储层物性向下游逐渐变好;顺直段以细-粉砂浊流沉积为主,储层质量较为稳定,仅在局部因Ca^(2+)离子富集致使胶结作用增强;弯曲段以粉砂质浊流堆积为主,较细的沉积粒度致使储层质量向下游方向随着埋深的增加而逐渐变差。调整段沉积过程控制储层质量,顺直段-弯曲段成岩作用控制储层质量。The Lingshui gas field,located in the upper reach of the Central Canyon in the Qiongdongnan Basin,shows the occurrence of turbidite sandstones.However,the turbidite sandstone reservoirs of diverse types,jointly affected by both sedimentation and diagenesis,present challenges in characterization.This study aims to forecast the distribution of favorable reservoirs in the deep-water areas of the Lingshui gas field.Based on the morphologies and burial depths of the Central Canyon,we categorize the upper reach of the canyon head into the adjustment section,the low-tortuosity section,and the curved section.This division allows for a detailed examination of the reservoirs’fracture and filling types in the reservoirs.Furthermore,we analyze the deposition and origin of the reservoir rocks based on the quantitative relationships between rock fabric and physical properties.The results indicate that the adjustment section is dominated by coarse-grained gravity flow deposits,with reservoir physical properties gradually improving downstream as the intergranular matrix content declines.The low-tortuosity section is primarily composed of fine-grained to silty turbidite sand bodies,with grain sizes marginally varying along the canyon and cementation emerging as a factor affecting the quality of reservoirs consisting of alternating thin-and thick-bedded sandstone.The curved section principally comprises silty turbidite sand bodies,with reservoir physical properties gradually deteriorating downstream with an increase in the burial depth.Therefore,it can be inferred that the reservoir quality is governed by the sedimentary process in the adjustment section and the diagenesis in the low-tortuosity and curved sections.

关 键 词：中央峡谷汇聚区 构型级次 物性展布 浊积砂体 琼东南盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]