| 松辽盆地古龙凹陷页岩油储层中的纳孔纳缝及其原位成藏理论初探 |
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| 引用本文： | 何文渊.松辽盆地古龙凹陷页岩油储层中的纳孔纳缝及其原位成藏理论初探[J].地学前缘,2023,30(1):260-280. |
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| 作者姓名： | 何文渊 |
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| 作者单位： | 1. Daqing Oilfield Co Ltd, Daqing 163002, China2. Heilongjiang Provincial Key Laboratory of Continental Shale Oil, Daqing 163712, China |
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| 基金项目： | 国家科技重大专项“大型岩性油气藏形成主控因素与有利区带评价"(2017ZX05001-002);中国石油天然气股份有限公司重大科技专项“大庆古龙页岩油勘探开发理论与关键技术研究"(2021ZZ10) |
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| 摘 要： | 古龙凹陷青山口组页岩油的，地质资源量达151亿t,是重要后备的油气资源。用电子背散射(HDBSD)发现了古龙页岩油储层中纳米孔和纳米缝非常发育，电子探针表明这些纳孔纳缝均被沥青充填。纳米孔的直径多在10～50 nm,中位数在20～30 nm,形态多不规则，多呈多角形，主要是一种E-F纳孔，其次为E-E纳孔，多与纳米缝联结。纳缝宽度多在10～50 nm,中位数也在20～30 nm。它们主要是由黏土片(黏土域)的F-F凝聚形成的。黏土的凝聚与有机质密切相关。黏土胶体由于同晶置换会带负电荷，使得其周围会吸附带正电的金属阳离子，形成一个带正电的黏土团。这种带正电的黏土团又会吸附带负电的腐殖酸(有机质)和初步降解的藻，形成一个有机黏土絮凝体。这种有机黏土絮凝体进入生排烃门限后，由于生排烃有机质体积会收缩，体积收缩最高可达87%。生排出的烃会就近充填在这种收缩形成的孔隙中，又由于纳孔纳缝的毛细阻力(约12 MPa)等使得排出的烃无法运移出去便形成了古龙页岩油的特殊连续原位油藏。
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| 关 键 词： | 页岩 黏土 有机质 纳孔纳缝 原位成藏 古龙凹陷 |
| 收稿时间： | 2022-07-07 |
Preliminary study on nanopores,nanofissures, and in situ accumulation of Gulong shale oil |
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| HE Wenyuan.Preliminary study on nanopores,nanofissures, and in situ accumulation of Gulong shale oil[J].Earth Science Frontiers,2023,30(1):260-280. |
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| Authors: | HE Wenyuan |
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| Institution: | 1. Daqing Oilfield Co Ltd, Daqing 163002, China2. Heilongjiang Provincial Key Laboratory of Continental Shale Oil, Daqing 163712, China |
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| Abstract: | The shale oil resource in the Qingshankou formation, Gulong Sag amounts to 15.1 billion tons, making it an important petroleum “backup” resource. Electron backscattering (HDBSD) shows that nm pores and fissures are well developed in the Gulong shale oil reservoir. The nm pores are mostly 10-50 nm in diameter (median 20-30 nm) and have irregular or polygonal shapes. They are mainly a kind of E-F nano holes, and some E-E nano pores, and connected to the nano fissures that have slit widths mostly between 10-50 nm (median 20-30 nm). The nm fissures are mainly formed in clays via F-F condensation. Clay coagulation is closely related to organic matter, especially algae. The clay colloid is negatively charged due to isocrystalline replacement, and metal cations are absorbed around it to form a positive clay group. The positively charged clays in turn adsorb the negatively charged humic acid (organic matter) and lightly degraded algae to form an organic clay flocculant. When the organic clay flocculates reach the hydrocarbon generation/release threshold, organic matter shrinks up to 87% in volume. Due to capillary resistance (~12 MPa) from nano fissures, the discharged hydrocarbon cannot migrate out, thus forming the special continuous in-situ shale oil reservoir of Gulong. |
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| Keywords: | shale clay organic matter nano-pore and nano-fissure in-situ accumulation Gulong Sag |
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