2D NMR studies of fluids in organic-rich shale from the Qingshankou Formation, Songliao Basin

被引：0

作者：

Bai L. ^{[1
]}

Liu B. ^{[1
]}

Chi Y. ^{[1
]}

Li S. ^{[2
]}

Wen X. ^{[1
]}

机构：

[1] Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Northeast Petroleum University, Ministry of Education, Daqing

[2] Shenyang Geological Survey Center, China Geological Survey, Shenyang

来源：

Oil and Gas Geology | 2021年 / 42卷 / 06期

关键词：

Abundance of organic matter; Qingshankou Formation; Shale; Songliao Basin; Two-dimensional NMR;

D O I：

10.11743/ogg20210613

中图分类号：

学科分类号：

摘要：

Shale may contain a large amount of oil and gas that can be commericially exploited. Clarifying the content and occurrence of different fluids in shale is crucial to the development of shale oil. High frequency (23 MHz) two-dimensional (2D) NMR technology that can be used to quickly, nondestructively and quantitatively measure protium-containing (1H) fluids in shale is employed to test shale samples (from the Qingshankou Formation in Songliao Basin) before and after extraction as well as during spontaneous imbibition and constant temperature rising experiments. The content and occurrence of different fluids in the samples as well as the loss of fluid from the samples after a period of static settlement are quantified and analyzed. The results show that on the 2D NMR maps, the signals of analogous solid organic matter and movable hydrocarbons, roughly separated by T2=0.1ms, are mostly distributed in the region above T1>10 ms. Good linear correlations can be observed between the signals and TOCs or S1. Oil is either free or absorbed in shale samples from the Qingshankou Formation. Higher clay content means more absorbed oil and less free oil in shale. The 2D NMR spectrum obtained during spontaneous imbibition experiment indicates water swelling of clay minerals. The vacuum heating process of the samples shows both volatilization of light hydrocarbons and significant loss of water. Samples from sealing core drilling combined with 2D NMR can be used effectively in the restoration of the original oil saturation and water saturation. © 2021, OIL & GAS GEOLOGY Editorial Board. All right reserved.

引用

页码：1389 / 1400

页数：11

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