ANALYSIS ON FRACTURE POTENTIAL FOR DIFFERENT TYPES OF ROCKS IN ARCHEAN BURIED HILL: A CASE STUDY OF LIAOHE WESTERN SAG

CAI Guo-gang; TONG Heng-mao

Volume 16 Issue 3

Sep. 2010

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Article Navigation > Journal of Geomechanics > 2010 > 16(3): 260-270

CAI Guo-gang, TONG Heng-mao, 2010. ANALYSIS ON FRACTURE POTENTIAL FOR DIFFERENT TYPES OF ROCKS IN ARCHEAN BURIED HILL: A CASE STUDY OF LIAOHE WESTERN SAG. Journal of Geomechanics, 16 (3): 260-270.

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CAI Guo-gang, TONG Heng-mao, 2010. ANALYSIS ON FRACTURE POTENTIAL FOR DIFFERENT TYPES OF ROCKS IN ARCHEAN BURIED HILL: A CASE STUDY OF LIAOHE WESTERN SAG. Journal of Geomechanics, 16 (3): 260-270.

Citation:

CAI Guo-gang, TONG Heng-mao, 2010. ANALYSIS ON FRACTURE POTENTIAL FOR DIFFERENT TYPES OF ROCKS IN ARCHEAN BURIED HILL: A CASE STUDY OF LIAOHE WESTERN SAG. Journal of Geomechanics, 16 (3): 260-270.

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ANALYSIS ON FRACTURE POTENTIAL FOR DIFFERENT TYPES OF ROCKS IN ARCHEAN BURIED HILL: A CASE STUDY OF LIAOHE WESTERN SAG

CAI Guo-gang^{1, 2
,},
TONG Heng-mao³

1.
College of Resources and Safety, China University of Mining Technology, Beijing 100083, China
2.
Exploration and Development Institute, PetroChina Liaohe Oilfield Company, Panjin124010, China
3.
State Key Laboratory of Petroleum and Prospecting, China University of Petroleum, Beijing 102249, China

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Abstract

Abstract

The Archean crystallization metamorphic rocks are important reservoir rock types in buried hill, and fracture developmental potential for different types of Archean metamorphic rocks have not been yet clearly recognized.Based on a large number of rock mechanics experiments, core fracture observation, imaging logging data, and oil field production practices, the fracture developmental potential for different types of Archean metamorphic rocks has been analyzed.Rock mechanics test results show that the mechanical properties are changable in different Archean lithology, e.g., the brittleness coefficient generally decreases with increase of dark minerals.In addition, rock mechanics parameters are closely related to the loading direction in gneiss which bear well-developed oriented structure.The brittleness coefficient f_b gets greater when the angle between gneissosity and the loading direction changes from less than 45° into greater than 45°.A large number of oil production practice data show that shear fracture is more often seen in the gneiss with oriented structure, while tension fracture in the granulite without oriented structure.According to the comprehensive analysis, the development potential of shear fracture in different rocks can be arranged as:gneiss class > mixed granite class > amphibolite; while that of tension fracture as: mixed granite class, light granulite > gneiss class > amphibolite.
- fracture,
- Archean buried hill,
- fracture development potential,
- rock mechanics test,
- brittleness coefficient

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References

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