Development of Mesozoic secondary pore zones in the Eastern Depression of North Yellow Sea Basin
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摘要:
北黄海盆地东部坳陷中生界储层以特低孔、超低渗型为主，对本区次生孔隙的研究是寻找优质储层和有利油气聚集区的重要内容，对油气勘探有重要意义。利用钻井、岩心和物性资料分析，采用岩石薄片鉴定，阴极发光和扫描电镜等方法，对北黄海盆地东部坳陷储层的岩石类型、孔渗特征以及孔隙类型进行研究，确定了次生孔隙带的发育规律及其影响因素。研究认为本区次生孔隙的发育除受到成岩作用因素影响外，还受到物质成分、沉积相带、地层不整合和构造裂隙等因素的控制。其中，沿地层不整合风化界面和大断裂的淋滤作用是形成次生孔隙、改善储层物性的重要因素。综合分析认为，研究区中部地区地层不整合界面附近是有利的次生孔隙带发育位置。
Abstract:The Mesozoic reservoirs in the Eastern Depression of North Yellow Sea Basin are commonly characterized by very low porosity and permeability. The most important task in the exploration of oil and gas of the basin is to study the secondary pores for finding the high quality reservoirs and favorable hydrocarbon accumulation areas. Combining the drilling, cores and physical property data, using the methods of thin section identification, cathodoluminescence and scanning electron microscope, characteristics of porosity and permeability and pore types are studied in this paper. Secondary pore zones and their influencing factors are discussed. It is found that the development of secondary pores is influenced not only by diagenesis, but also by the material composition, sedimentary facies, stratigraphic unconformity, and structural fractures. The eluviations along the stratigraphic unconformities, weathering surfaces and faults are the most important factors for the formation of secondary pore and improvement of reservoir properties. In sum, the favorable position for the secondary pores is always close to the unconformity surfaces in the middle Eastern Depression of the North Yellow Sea Basin.
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Key words:
- secondary pore zone /
- unconformity /
- North Yellow Sea Basin /
- Mesozoic
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表 1 北黄海盆地东部坳陷中生界储层孔隙类型及特征
Table 1. The Mesozoic reservoir porosity types and characteristics in the Eastern Depression，the North Yellow Sea Basin
孔隙类型 特征 原生孔隙 粒间孔 胶结作用剩余孔隙 杂基微孔隙 黏土矿物晶间孔、凝灰质填隙物孔 次生孔隙 粒间溶孔 粒间填隙物溶蚀 粒内溶孔 石英、长石粒内溶蚀 微收缩孔 矿物蚀变、凝灰质脱玻化 裂缝 碎屑颗粒表面破裂缝、构造裂隙 
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