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首页> 外文期刊>Geological Journal >Developmental characteristics and distribution law of fractures in a tight sandstone reservoir in a low-amplitude tectonic zone, eastern Ordos Basin, China
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Developmental characteristics and distribution law of fractures in a tight sandstone reservoir in a low-amplitude tectonic zone, eastern Ordos Basin, China

机译：中国东部鄂尔多斯盆地低幅度构造区骨灰储层骨折的发展特征及分布规律

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摘要

In recent years, a large number of vertical and horizontal sliding fractures were found in the Upper Palaeozoic sandstones in the eastern margin of the Ordos Basin, China, However, the effect of fractures on the distribution of tight sandstone gas is still unclear. Therefore, in this paper, a large number of cores, thin sections, petrophysical property test results, conventional and FMI (Formation MicroScanner Image) image logs, and gas-testing results were used to study the developmental characteristics of fractures and the gas control effects in a tight sandstone reservoir, in the eastern margin of the Ordos Basin. It was found that the average linear density of the core fractures is generally less than 2 m(-1), and the microfractures are characterized as ruptures of quartz particles. The underlying Taiyuan and Benxi formations have the highest fracture development degrees, and the fracture index (FI) values are 0.68 and 0.72, respectively. However, the fracture development degrees in the overlying Shanxi to Shiqianfeng formations are significantly lower, and the FI values are generally less than 0.63. There is a good positive correlation between the fracture development degree and the contents of quartz mineral or brittle minerals (quartz + feldspar). On the whole, the fractures in the uplift and slope parts of the low-amplitude structure areas are more developed, while in the depression zones, the fractures are generally less developed. The fractures in the Zijinshan Uplift area are extremely well developed; thus, the preservation conditions of the reservoir are poor. In this case, the fractures are unfavourable for the accumulation of natural gas. For the gentle tectonic zones, the over-developed fractures in the Benxi and Taiyuan formations are unfavourable for the preservation of natural gas. However, the moderately developed fractures in the overlying Shanxi to Shiqianfeng formations are beneficial to the enrichment of natural gas. Finally, we compared the relationship between fracture index (FI) and open-flow productivity of the gas wells, and it was found that FI values of commercial gas wells (Types I, II, and III gas wells) are generally greater than 0.55, while the FI values of Type IV low-yield gas wells are generally less than 0.55.
机译：近年来，在鄂尔多斯盆地的东部边缘的上部古生代砂岩中发现了大量的垂直和水平滑动骨折，然而，骨折对紧密砂岩天然气分布的影响尚不清楚。因此，在本文中，大量核心，薄部分，岩石物理测试结果，常规和FMI（形成Microscanner Image）图像原木，以及气体测试结果用于研究裂缝和气体控制效果的发育特性在鄂尔多斯盆地东部边缘的紧密砂岩水库。发现核心骨折的平均线性密度通常小于2μm（-1），并且微裂缝的特征在于石英颗粒的破裂。底层太原和Benxi形成具有最高的骨折开发度，裂缝指数（FI）值分别为0.68和0.72。然而，山西覆盖山西到世勤地层的骨折发展程度明显较低，而且固定值一般小于0.63。骨折开发程度与石英矿物或脆性矿物质（石英+长石）之间存在良好的正相关性。总的来说，低振幅结构区域的隆起和斜面部分的裂缝更加开发，而在抑郁区中，裂缝通常不开发。 Zijinshan隆起区域的骨折非常好;因此，水库的保存条件差。在这种情况下，裂缝对于天然气的积累是不利的。对于柔和的构造区域，本溪和太原地层的过度发达的骨折是保护天然气的不利。然而，在山西覆盖山西的中度发育的骨折是有利于天然气的富集。最后，我们比较了裂缝指数（FI）与气井的开放式生产率之间的关系，并发现商业气体井（类型I，II和III气井）的值通常大于0.55，虽然IV型低产量气井的固定值通常小于0.55。

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