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| Characteristics of fractures from borehole walls of gas-hydrate drilling holes in Muli region |
Yang LI1,2,3, Dong-Ming LIU1,2,3( ), Zhen-Zhou LIN1,2,3, Yu-Hang WANG1,2,3, Ding-Yu JIA1,2,3, Yang OU1,2,3 |
1. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China
2. Eelectromagnetic Detection Technology Key Laboratory of Ministry of Natural and Resources, Langfang 065000, China
3. National Modern Geological Exploration Technology Research Center, Langfang 065000, China |
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Abstract 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, high-angle fractures are dominant, followed by low-angle fractures, and the vertical and horizontal fractures are rare. ②The 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. ③It 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.
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Received: 25 September 2018
Published: 20 February 2019
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Corresponding Authors:
Dong-Ming LIU
E-mail: liudongming@igge.cn
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Schematic diagram of geology and drilling location in the research area
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The response characteristics of different types of fractures from ultrasonic image logging
a—horizontal fractures;b—low-angle fractures;c—high-angle fractures;d—vertical fractures;e—mud filled fractures;f—calcite filled fractures;g—drilling induced fractures
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The line density curve of fractures for every hole
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The stereographic projection of fracture dip and azimuth for every hole
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