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Characteristics of fractures from borehole walls of gas-hydrate drilling holes in Muli region

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Authors:Li Yang; Liu Dongming; Lin Zhenzhou; Wang Yuhang; Jia Dingyu; Ou Yang
Author Affiliations:Primary:
Institute of Geophysical and Geochemical Exploration, CAGS, Beijing, China
National Modern Geological Exploration Technology Research Center, China
Volume Title:Wutan yu Huatan Geophysical & Geochemical Exploration
Source:Wutan yu Huatan = Geophysical & Geochemical Exploration, 43(1), p.84-89. Publisher: Geological Publishing House, Beijing, China. ISSN: 1000-8918
Publication Date:2019
Note:In Chinese with English summary. 17 refs.
Summary:Well-developed faults and diversified lithology constitute the features of Sanlutian well field, and the drilling results reveal that gas hydrate mainly occurs in the fractures of reservoirs. Therefore, the acoustic image logging data are used specifically to study the structural fractures from borehole walls of gas-hydrate drilling holes in Sanlutian well field. In this paper, the response characteristics of fractures in acoustic image logging were confirmed and the linear density, dip angle and dip direction of fractures were discussed. Some conclusions have been reached: (1) Fractures are developed in the borehole walls of gas-hydrate drilling holes. In these fractures, highangle fractures are dominant, followed by low-angle fractures, and the vertical and horizontal fractures are rare. (2)The main strike of fractures is basically consistent with the fault strike or oblique-crossing at small angles. The distribution of fractures is controlled distinctly by faults. (3)It is unfavorable for the assembly of hydrocarbon gases as the fractures of the study area are dominated by high-angle fractures, which is one of the possible reasons why gas-hydrate is rare.
Record ID:878326-10
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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