CHARACTERISTICS AND QUALITY ASSESSMENT OF LATE PALEOZOIC CARBONATE RESERVOIRS IN NANPANJIANG DEPRESSION
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摘要: 南盘江坳陷的海相油气勘探潜力巨大,至今未取得实质性的突破的重要原因之一就是储集岩特征的认识不清。在储层沉积学各种研究的基础上,利用大量地面和井下资料,论述了南盘江地区海相碳酸盐岩储集岩特征及储集空间类型,探讨了本区储层发育的主要控制因素,如沉积相带及成岩作用等,研究区储集岩类型以礁滩灰岩和白云岩较好,有利储层发育的层位主要集中于中泥盆统、中上石炭统和二叠系,总体储集性能评价为Ⅱ-Ⅲ类储层,有利储层分布区主要位于研究区西北部的碳酸盐台地边缘一线,以及孤立台地周缘的礁滩环境。Abstract: There is great potential of marine petroleum in the Nanpanjiang Depression. So far, no achievement has been reached due to lack of understanding of reservoir characters. This paper deals with the carbonate reservoir properties, including lithology and storage space of the carbonates, based on surface and subsurface data. The controlling factors of the reservoir, such as depositional process and diagenesis were studied. It is concluded that the best reservoirs are the limestone and dolomite of and reef flat facies of Middle Devonian, Upper-Mid Carboniferous and Permian. According to the reservoir properties, they are evaluated as the typeⅡ-Ⅲ of reservoirs. The most favorable reservoir, i.e. the reef flat deposits deposited along the margins of the carbonate platform margin is widely distributed in the northwest part of the study area.
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Key words:
- reservoir characteristics /
- carbonate rock /
- Late Paleozoic /
- Nanpanjiang depression /
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