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| Titel |
Characterization and Geological Model of Fractured shale Reservoir in Eastern China |
| VerfasserIn |
Q. Li, S. Shao, X. Xia |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064526
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| Zusammenfassung |
| Almost all fractured shale reservoirs are distributed in source rocks which are mainly
composed of mudstone and shale, abundant in organic matter, calcareous and siliceous
minerals. Compared with sandstone and Carbonate reservoir, Shale reservoir with strong
plasticity has common and specificity on fractures type and origin, identification method,
parameter estimation, and distribution prediction. The shale reservoir fractures can
de-classified into two groups of fracture according to their origin, structural and
non-structural fracture. Structural fracture, including high-angle shear fracture, tensile and
shear fractures and low-angle slip fracture, belongs to ductile shear fracture. Non-structural
fracture in shale, more developed than other types of lithology, such as shrinkage fractures,
overpressured fractures and weathered fracture, resulted from diagenesis, drying crack,
overpressure, mineral phase transformation, recrystallizaion, and pressure-solution.
The shale reservoir was almost formed in lacustrine lamellar marl in the deep lake
environment. The endogenetic action for forming and growing mudstone fractures includes
high content of organic carbon, moderate mixing ratio of formations and burial
depth, predominant formation combination. The ectogenetic action for forming
mudstone reservoir is the special structural environment. The srtuctural fracture and
hydrocarbon generation fracture are the main space for oil accumulation and the
percolation channel for mudstone reservoir. The disappeared edge, intersection zone
and outside zone of faults are the growing areas for mudstone reservoir. Then it is
summarized the methods of fracture identification parameter estimation, fracture
reservoir distribution prediction using geological seismic, drilling and logging and
structural stress, and then propose current problems and trend of study on shale fracture
reservoir.
References
1.Qi Li,Tuofu Wang et al,A fracture network model and open fracture analysis of a
tight sandstone gas reservoir in Dongpu Depression,Bohaiwan Basin,Eastern China
2009.Geophysical Prospecting,57(2):275Â 282
2.John B. Curtis: Fractured shale-gas systems, AAPG 2002,V86(11),P1921Â 1938
3.M. Gutierrez, L.E.Qino, R. Nygard, Stress-dependent permeability of a de-mineralised
frature in shale. Marine and Petroleum Geology 2000, 17: 895Â 907
4.J. E. Olson. Natural Fracture Pattern Characterization Using a Mechanically- Based
Model Constrained by Geologic Data-Moving Closer to a Predictive Tool. J. Rock Mech.
Min. Sci. 1997, Vol34, No3/4 P391
* This project was supported by the National Natural Science Foundation of China
(41033853/D06). |
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