Abstract
With the continuous development of hydrocarbon exploration, how to efficiently, economically, accurately, and comprehensively obtain mineral species, composition, and structure and diagenesis information has become one of the hot topics in both the academia and industry. By scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), a new method of qualitative mineral identification and quantitative measurement is established. Typical tight sandstone reservoir rock samples in the Ordos Basin are selected; through the element surface scanning image of “mineral element composition” and “pixel element combination”, mineral types are distinguished, and mineral parameters such as types, characteristics, and content are rapidly and accurately determined. Meanwhile, such results achieved via the new method are compared with conventional XRD and TIMA methods. The results show that the new method exhibits several advantages: cost advantages compared to XRD experiment analysis technology and TIMA system and ability to analyze low content minerals which XRD techniques are hard to identify; it allows quantitative characterization on the phenomenon of mineral miscibility, which is of great significance to explore the mineral diagenetic evolution.
Highlights
The rapid development of oil and gas exploration requires more detailed study of the tight reservoirs
The back and bottom noise of surface scanning will produce a small amount of bright spots, which cannot be distinguished from low-content elements
The reasons may include the following: (1) the new method is based on scanning electron microscopy, and skeleton minerals need to be firstly cut for sample preparation, which leads to a larger plane distribution area of skeleton minerals; (2) miscible minerals will appear identification bias, and X-ray diffraction (XRD) identification is based on a certain industry standard classification, which will cause deviation; (3) the new mineral identification method can denoise the skeleton minerals and increase the surface area of the skeleton minerals
Summary
The rapid development of oil and gas exploration requires more detailed study of the tight reservoirs. The methods of qualitative observation of minerals include the optical microscope method, scanning electron microscopy, and infrared spectroscopy [5,6,7]. The optical microscopy method provides comprehensive analysis of mineral characteristics and mutual relationships. The scanning electron microscope and the X-ray methods are often combined to realize the comprehensive analysis of the mineral components and microstructure [12, 13]. The infrared spectrum method is to obtain the structure information of the mineral molecules and obtain composite database by establishing the infrared spectrum diagram. This method has been used to qualitatively characterize the minerals, to study the composition of oil and gas inclusion, and the temperature
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