济阳坳陷桩海地区碎屑岩优质储层特征及成因机制

doi:10.3969/j.issn.1006-6535.2024.03.004

摘要/Abstract

摘要： 济阳坳陷桩海地区油气资源丰富,新近系和潜山地层探明储量较高,而古近系钻探和认识程度较低,古近系储层特征和优质储层的成因机制认识不清。为此,通过岩心、薄片、扫描电镜等分析手段,对桩海地区东下段—沙河街组碎屑岩储层的岩石学特征、成岩作用类型、储集空间特征及优质储层控制因素进行了研究。结果表明:桩海地区东下段—沙河街组碎屑岩储层分布范围小、厚度薄,储层以近源快速沉积的砂岩为主,岩石成熟度较低;压实作用是破坏储层孔隙的主要原因,以碳酸盐岩为主的胶结作用对孔隙造成了进一步的破坏,而有机酸溶蚀是形成次生孔隙、造成储层增孔的重要因素;孔隙类型整体以次生孔隙为主,原生孔隙仅在西北物源区东下段储层保留程度相对较高,储层裂缝发育程度低;优质储层发育主要受控于沉积条件、成岩改造和断裂沟通3个条件。岩石成熟度高、远离钙源、靠近酸源、断裂沟通的砂砾岩储层为有利勘探目标。该研究可为桩海地区古近系勘探开发提供地质依据。

关键词: 成岩作用, 碎屑岩储层质量, 储层成因, 隐蔽油气藏, 桩海地区, 济阳坳陷

Abstract: Oil and gas resources are rich in Zhuanghai Area of Jiyang Depression. The proven reserves are high in the Neocene and buried hill strata, while the degree of drilling and understanding of the Paleogen is low, and the characteristics of the Paleogen reservoirs and the genesis mechanism of high-quality reservoirs are poorly understood. For this reason, we have studied the petrological characteristics, type of diagenesis, spatial characteristics of clastic reservoirs and the controlling factors of high-quality reservoirs in the Lower Dongying Member-Shahejie Formation in Zhuanghai Area through the means of analysis such as cores, thin sections, scanning electron microscopy, etc. The results show that the clastic reservoirs of the Lower Dongying Member-Shahejie Formation in Zhuanghai Area have a small distribution range and thin thickness, and the reservoirs are dominated by sandstones deposited rapidly near sources with low rock maturity. The compaction is the main reason for destroying the pore space of the reservoirs. The cementation, mainly carbonate cementation, has caused further damage to the pore space. The dissolution of organic acid is an essential factor for forming secondary pore space and increasing pore space in the reservoir. The overall pore type is dominated by secondary pores and primary pores are only retained to a relatively high degree in the reservoirs of the Lower Dongying Member in the northwest source area, and the reservoir fractures are few. The high-quality reservoirs is mainly controlled by three conditions: sedimentary conditions, diagenetic modification, and fracture communication. The glutenite reservoirs are favorable exploration targets with high rock maturity, far from calcium sources, close to acid sources, and fracture communication. This study can provide the geological basis for the exploration and development of the Paleocene system in Zhuanghai Area.

Key words: diagenesis, clastic reservoir quality, reservoir genesis, subtle oil and gas reservoir, Zhuanghai Area, Jiyang Depression

中图分类号:

TE122.1

韦敏, 于世娜, 佟欢, 吴彦佳, 周红科, 史潇潇, 郭厚根. 济阳坳陷桩海地区碎屑岩优质储层特征及成因机制[J]. 特种油气藏, 2024, 31(3): 27-36.

Wei Min, Yu Shina, Tong Huan, Wu Yanjia, Zhou Hongke, Shi Xiaoxiao, Guo Hougen. Characteristics and Genesis Mechanism of High-quality Clastic Reservoirs in Zhuanghai Area of Jiyang Depression[J]. Special Oil & Gas Reservoirs, 2024, 31(3): 27-36.

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