沁水盆地南部煤岩储层天然裂缝有效性及对煤层气开发的影响

doi:10.11743/ogg20200317

Abstract

Abstract: Natural fractures were well developed in coalbed mathane (CBM) reservoirs in the southern Qinshui Basin,and their effectiveness is an important factor affecting the seepage ability of CBM reservoirs and the high production of CBM wells.In this study,the types and development characteristics of natural fractures in the Upper Paleozoic CBM re-servoirs,southern Qinshui Basin,are investigated by using outcrop,core and scanning electron microscopy (SEM) data.Then,the fracture effectiveness and its main controlling factors are analyzed.Finally,the influence of effective fractures on CBM development is discussed in combination with single-well dynamic production performance.The results show that cleats and tectonic fractures were mainly developed in the study area.The cleats include face and butt cleats,and the tectonic fractures include shear and tension fractures.There are marked differences in the fracture effectiveness of various types under the influence of multiple geological factors.The cleats were formed at the stage of coalification and mostly filled or semi-filled by calcites and clay minerals,resulting in poor effectiveness of fractures.Most tectonic fractures were not filled with minerals,and their effectiveness is mainly controlled by fracture size,dip angle,reservoir depth and their included angle with the direction of the in-situ maximum principal stress at present.The tectonic fractures feature large aperture,longer propagation and good fracture effectiveness.High-angle tectonic fractures are more effective than oblique fractures.Affected by the change of in-situ stress state,the fracture effectiveness varies systematically with the increasing burial depth,i.e.,from fair to good and then fair again.The NE-SW-trending fractures are the most effective,followed by nearly EW-trending and nearly NS-trending fractures,and the NW-SE-trending fractures coming at last.The tectonic fractures,better in terms of both scale and fracture effectiveness compared with the cleats,are the main seepage and production channels of coalbeds,and play a positive role in the CBM development.However,over-sized tectonic fractures,especially when cutting through the coal seam and extending into the roof and floor,will result in the loss of CBM,the decrease of reservoir pressure,and the incursion of external formation water.Therefore,it is not conducive to the preservation and effective exploitation of CBM.

Key words: natural fracture, effectiveness, CBM reservoir, CBM development, Upper Paleozoic, Qinshui Basin

CLC Number:

TE122.2

Shi Jinxiong, Zeng Lianbo, Tan Qingsong, Wang Jipeng, Zhang Yunzhao, Li Hongwei. Effectiveness of natural fractures in CBM reservoirs and its influence on CBM development in the southern Qinshui Basin[J]. Oil & Gas Geology, 2020, 41(3): 617-626.

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Effectiveness of natural fractures in CBM reservoirs and its influence on CBM development in the southern Qinshui Basin

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