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首页> 外文期刊>Marine and Petroleum Geology >Characterization of fracture formation in organic-rich shales - An experimental and real time study of the Permian Lucaogou Formation, Junggar Basin, northwestern China
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Characterization of fracture formation in organic-rich shales - An experimental and real time study of the Permian Lucaogou Formation, Junggar Basin, northwestern China

机译：有机富子系中骨折形成的特征 - 墨芦沟沟地层的实验与实时研究，中国西北朱根盆地

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Volume fracturing in horizontal wells represents a principal technology in the effective economic development of unconventional shale oil and gas reservoirs. However, the number of intervals that were effectively fractured by this technology only account for 20%-50% of the total designed sections. Fracture development characteristics and the factors controlling artificial fracture growth in organic-rich shale require detailed evaluation; this cannot be accomplished using microseismic monitoring technology or well-log interpretation. In this paper, formation processes of micro- and nano-scale fractures in the organic-rich shales of the Lucaogou Formation, Jimusaer Sag, Junggar Basin, northwestern China, were presented. The study focused on the application of in situ, nano-scale CT imaging technology, in combination with rock mechanics analysis. Results allowed the visualization of fracture growth in the shale reservoirs, and revealed the influence of organic matter, mineral composition, and pore structure on the formation and distribution of artificial fractures. A three-dimensional dynamic growth model of micro- and nano-scale fractures in organic-rich shale was established. Data revealed that the Lucaogou Formation shale contained dolomite and illite intragranular pores, with a low abundance of organic pores; pore size ranged between 200 nm and 2 mu m. Micro- and nano-size fractures were observed. The development of artificial fractures was positively correlated with the loading stress. The initiation stress of new generated fractures was 475 mN, which could break up dolomite, albite, K-feldspar, and the original pore system as well. The original pore system was generally conducive to fracture extension and expansion. As loading stress increased from 50 mN to 515 mN, the sample extension increased from 2 mu m to 14 mu m, and artificial fracture width increased from 0.3 mu m to 10 mu m. The total porosity increased from 5.45% to 8.35%, and volume growth rate reached 53.2%. These findings provide valuable insights into the study of fracture growth in organic-rich shales, and have implications for the design of hydro-fracturing in organic-rich shales.
机译：水平井的体积压裂代表了非传统页岩油气储层有效经济发展的主要技术。然而，通过该技术有效地破坏的间隔数仅占全面设计部分的20％-50％。骨折开发特征及控制有机富含物体的人工骨折生长的因素需要详细评估;这不能使用微震监测技术或对数解释来实现。本文介绍了卢卡口组织中有机富含富型HALALS的微型和纳米级骨折的形成过程，吉姆苏瑟凹陷，中国西北部的JIMUSAER SAG。该研究专注于原位，纳米规模CT成像技术的应用，与岩石力学分析相结合。结果允许在页岩储层中裂缝的可视化，并揭示了有机物质，矿物成分和孔隙结构对人工骨折的形成和分布的影响。建立了有机富含物体微珠和纳米级骨折的三维动态生长模型。数据显示，Lucaogou形成页岩含有白云岩和伊利肌毛孔，有很多有机毛孔;孔径范围为200纳米和2亩。观察到微型和纳米尺寸骨折。人造骨折的发展与负载应力呈正相关。新生成骨折的起始胁迫为475毫升，也可以分解白云石，阿尔摩，K-Feldspar和原始孔系统。原始孔系统通常有利于断裂延伸和膨胀。随着装载应力从50ml增加到515米，样品延伸从2μm至14μm增加，人工裂缝宽度从0.3μm升高到10μm。总孔隙率从5.45％增加到8.35％，体积生长速率达到53.2％。这些发现提供了有价值的见解，对有机富含Halales的骨折生长研究，并对有机富含Halales中的水力压裂设计有影响。

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