Fracture identification and characterization of Ordovician carbonate rock reservoir in block B of the Tahe oilfield

IF 1.1 4区地球科学 Q3 GEOLOGY Carbonates and Evaporites Pub Date : 2024-03-26 DOI:10.1007/s13146-024-00957-2

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Abstract

The distribution of fractures in fractured-vuggy reservoirs of Ordovician carbonate rock in the Tahe oilfield is one of the main controlling factors for oil and gas enrichment in this area. Determining the spatial distribution of fractures is the key to stable production in this area. First, this article uses cores and thin sections to analyse the characteristics of fractures. The area is dominated by structural fractures, with relatively few dissolution fractures and diagenetic fractures. The average length of the fractures is 5.25 cm, the average opening is 0.21 cm, the average angle is 40.33°, and the average line density is 3.05 lines/m. Second, rock mechanical parameters were calculated using dipole shear wave logging curves and conventional logging curves, and fracture development index (FI) curves were constructed. Using the variations in the performance characteristics of the FI curve the spatial distribution patterns of fractures in different fracture development segments are qualitatively analyse. The predicted results are then verified by combining core, thin section, and imaging logging data, and the coincidence rate reached 83%. The following conclusions are drawn: Vertically, fractures are mostly concentrated in the Yijianfang Formation, with the characteristics of “small scale and scattered”. On the plane, the development scale of fractures in the denudation area is good, with great development potential. Combined with the production of each well, it is verified that the fracture development segment identified by the fracture FI curve has guiding significance for oil and gas exploration.

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塔河油田 B 区块奥陶系碳酸盐岩储层的裂缝识别与特征描述

摘要塔河油田奥陶系碳酸盐岩断裂-凹陷储层的裂缝分布是该地区油气富集的主要控制因素之一。确定裂缝的空间分布是该地区稳产的关键。首先，本文利用岩心和薄切片分析裂缝的特征。该地区以构造断裂为主，溶蚀断裂和成岩断裂相对较少。断裂的平均长度为 5.25 厘米，平均开口为 0.21 厘米，平均角度为 40.33°，平均线密度为 3.05 条/米。其次，利用偶极剪切波测井曲线和常规测井曲线计算了岩石力学参数，并构建了裂缝发育指数（FI）曲线。利用 FI 曲线性能特征的变化，定性分析了不同断裂发育段的断裂空间分布模式。然后结合岩心、薄层剖面和成像测井数据对预测结果进行了验证，吻合率达到 83%。得出以下结论：纵向上，断裂主要集中在易家坊地层，具有 "规模小、分布散 "的特点。平面上，剥蚀区断裂发育规模较好，开发潜力大。结合各井产量，验证了断裂FI曲线确定的断裂发育段对油气勘探具有指导意义。

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来源期刊

Carbonates and Evaporites 地学-地质学

CiteScore

2.80

自引率

14.30%

发文量

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.