| 南海南部北康盆地碳酸盐岩储层特征及油气成藏 |
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| 引用本文： | 鄢伟,张光学,张莉,杨振,王后金,胡小强,雷振宇,孙鸣.南海南部北康盆地碳酸盐岩储层特征及油气成藏[J].地球科学,2022,47(7):2549-2561. |
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| 作者姓名： | 鄢伟 张光学 张莉 杨振 王后金 胡小强 雷振宇 孙鸣 |
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| 作者单位： | 1.南方海洋科学与工程广东省实验室(广州), 广东广州 511458 |
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| 基金项目： | 南方海洋科学与工程广东省实验室（广州）人才团队引进重大专项GML2019ZD0208中国地质调查局项目DD20221860中国地质调查局项目DD20191009广州市科技计划项目202201011397 |
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| 摘 要： | 在南海扩张过程中微板块断裂、碰撞、拼接的构造背景下，南海南部中新世以来发育碳酸盐岩台地及生物礁，经过后期成岩改造形成了大量碳酸盐岩储层并蕴藏着丰富的油气资源.为了了解该海域碳酸盐岩储层的发育特征和成因机制，以北康盆地高精度二维地震资料为基础并结合邻区岩心、薄片资料，对该区域碳酸盐岩储层发育的类型、储集空间、成岩作用以及控制因素开展了系统研究.结果表明，南海南部碳酸盐岩储层类型多且储集空间丰富，主要有两类，分别为礁滩储层和不整合面岩溶储层；发育多种孔隙类型，包括原生孔隙和次生孔隙，以次生孔隙为主，包括铸模孔、粒内溶孔、粒间溶孔和晶内溶孔等. 该区域碳酸盐岩储集空间主要受白垩化作用、溶蚀作用和白云岩化的建设性改造，并且主要受构造、沉积、古气候和流体活动因素的控制.北康盆地碳酸盐岩可以作为良好的储层，并具有良好的油气成藏条件，能形成“下生上储”的碳酸盐岩油气藏.
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| 关 键 词： | 南海南部 北康盆地 碳酸盐岩储层 成岩作用 控制因素 油气藏 石油地质学 |
| 收稿时间： | 2021-09-30 |
Carbonate Reservoirs Characteristics and Hydrocarbon Accumulation in Beikang Basin,Southern South China Sea |
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| Abstract: | In the context of the fracture, collision, and splicing of microplates during the expansion of the South China Sea, carbonate platforms and reefs have developed in the southern South China Sea since the Miocene. After later diagenetic transformation, a large number of carbonate reservoirs have been formed and contain rich hydrocarbon resources. In order to understand the development characteristics and genetic mechanism of carbonate reservoirs in this area, a systematic study was carried out on the types, storage spaces, diagenesis and control factors of carbonate reservoirs in this area based on high-precision 2D seismic data and combined with core and thin section data. The analysis shows that there are many types of carbonate reservoirs in the southern part of the South China Sea, and there are mainly three types, namely reef and shoal reservoir, karst reservoir and dolomite reservoir. A variety of pore types are developed, including primary pore and secondary pore, which is dominated by secondary pore, including mold pore, intracrystalline dissolved pore, intergranular pore and intracrystalline pore. The carbonate reservoir space in this region is mainly reconstructed by chalkization, dissolution and dolomization. The development of carbonate reservoirs is mainly controlled by tectonic, sedimentary, paleoclimate and fluid activities, and can be used as a good reservoir. The Beikang Basin has favorable hydrocarbon conditions and can form carbonate hydrocarbon reservoirs with "lower generation and upper storage". |
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