塔里木盆地顺北超深层碳酸盐岩断层控制储层天然裂缝和地质甜点评价

IF 1.1 4区 地球科学 Q3 GEOLOGY
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引用次数: 0

摘要

摘要 塔里木盆地顺北超深碳酸盐岩走向滑动断层控制储层储量丰富。走向滑动断层和天然构造裂缝是油气资源的主要储集空间和流动通道。因此,研究这类储层的天然断裂发育特征具有重要意义。顺北地区中、下奥陶统地层岩性为灰岩和白云岩,包括包岩、瓦克岩、纹理岩、束缚岩、石灰泥岩、硅化灰岩和硅质细晶白云岩、中粗晶白云岩等。根据岩芯样品的断裂密度和脆性指数统计发现,在石灰岩中,石灰质泥岩的脆性指数最高,而结合岩的脆性指数最低;在白云岩中,中粗晶白云岩的脆性指数高于硅质细晶白云岩。天然构造裂隙密度与岩石脆性指数呈明显的正相关。白云岩的脆性指数一般高于石灰岩。当脆性指数相同时,白云岩的孔隙度和渗透性较好,而石灰岩的断裂能力较强。碳酸盐岩储层中的这类高脆层更有可能成为顺北地区的地质甜点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of natural fractures and geological sweet spot in the Shunbei ultra-deep carbonate fault-controlled reservoir, Tarim Basin

Abstract

The Shunbei ultra-deep carbonate strike-slip fault-controlled reservoir in Tarim Basin is rich in reserves. The strike-slip faults and the natural structural fractures are the main storage space and flow channels of hydrocarbon resources. Therefore, studying the natural fracture development characteristics in this kind of reservoir is of great significance. The lithology of the Middle and Lower Ordovician strata in the Shunbei area is limestone and dolomite, including packstone, wackestone, grainstone, boundstone, lime mudstone, silicified limestone and silty-fine crystalline dolomite, medium-coarse crystalline dolomite. Based on the statistics of fracture density and brittleness index of core samples, it is found that in limestone, lime mudstone has the highest brittleness index, while boundstone has the lowest; in dolomite, the brittleness index of medium-coarse crystalline dolomite is higher than that of silty-fine crystalline dolomite. The natural structural fracture density has an obvious positive correlation with the rock brittleness index. The brittleness index of dolomite is generally higher than that of limestone. When the brittleness index is the same, dolomite has superior porosity and permeability, whereas limestone has a stronger capacity to fracture. Those kinds of highly brittle layers in carbonate reservoirs are more likely to be geological sweet spots in the Shunbei area.

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来源期刊
Carbonates and Evaporites
Carbonates and Evaporites 地学-地质学
CiteScore
2.80
自引率
14.30%
发文量
70
审稿时长
3 months
期刊介绍: Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability. The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.
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