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随着莺歌海盆地东方区、乐东区等成熟区域及莺歌海组、黄流组等主力层系勘探程度的日益提高，盆地已逐渐进入以中深层超压低渗领域勘探为主的阶段。针对盆地东缘勘探程度相对低、中深层储层特征与优质储层成因认识不清等问题，依托岩芯观察、镜下薄片鉴定、测录井资料及各类分析化验资料等开展了系统研究：识别了莺歌海盆地东缘中深层8大类16小类岩相；明确了中深层砂岩储层“特低孔特低渗、次生孔隙主导”的基本特征；划分了中深层储层6种成岩相以及23种岩相-成岩相综合类型；揭示了盆地东缘中深层次生孔隙主导型“双相控储、超压和烃类充注保孔”的优质储层形成机制。该研究从沉积-成岩理论层面，完善了中深层超压低渗储层研究体系，以期为莺歌海盆地东缘中深层超压低渗领域勘探突破提供理论支撑与技术指导。
Abstract：With the increasing exploration degree in mature areas such as the Dongfang Area and Ledong Area of the Yinggehai Basin, as well as the main stratigraphic series such as the Miocene Yinggehai and Huangliu formations, the basin has gradually entered a stage of exploration, on which the medium-deep overpressured low permeability fields are focused. To address issues in the eastern margin of the basin, including relatively low exploration degree, unclear understanding of the characteristics of medium-deep reservoirs, and the genesis of high-quality reservoirs, the core and microscopic thin-section observations, logging data, and various types of analytical and test data were analyzed in detail. Eight major categories and 16 subcategories of lithofacies in the medium-deep layers of the eastern margin of the Yinggehai Basin were identified. The medium-deep sandstone reservoirs were found to be characteristic of “ultra-low porosity, ultra-low permeability, and dominance of secondary pores”. Six diagenetic facies of medium-deep reservoirs and 23 comprehensive lithofacies-diagenetic facies types were classified. The mechanism of high-quality reservoir formation was dominated by secondary pores following specifically the rule of “reservoir control by dual facies, and pore preservation by overpressure and hydrocarbon charging”. The theory on sedimentary-diagenetic exploration for medium-deep, ultra-low pressure and low-permeability reservoirs was improved, which provided a theoretical support and technical guidance for exploration breakthroughs in the medium-deep, ultra-low pressure and low-permeability fields of the eastern margin of the Yinggehai Basin.
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基本信息:
DOI：10.16028/j.1009-2722.2025.111
中图分类号:P618.13
引用信息:
[1]沈娇,李宏义,武爱俊,等.莺歌海盆地东缘中深层超压低渗储层特征与优质储层形成机理[J].海洋地质前沿,2026,42(05):10-22.DOI:10.16028/j.1009-2722.2025.111.
基金信息:
中国海洋石油有限公司“十四五”重大科技项目“中国近海新区新领域勘探技术”（KJGG2021-0300）; 中海石油（中国）有限公司重大项目“南海天然气基础地质与勘探战略方向”（2021-KT-YXKY-05）
2025-05-22
2025
2025-11-03
2025-12-01
2025
1
2026-05-28
2026-05-28