CAJ | 학술논문

通过对石楼北区块岩层与煤层中大量的节理产状分析，厘定了4套节理配套关系，并在此基础上恢复了4期构造应力场特征。研究认为：本区的节理走向以NWW—NNW、NNE—NE向为主，为燕山期NW—SE向和喜马拉雅期NE—SW向的构造应力作用下形成。多期构造应力的共同作用形成了煤层大密度割理，且煤层一组主要割理方向与现代应力场最大主应力方向较为一致，促进了煤割理的张开，提高了渗透率。煤层与围岩中节理产状的偏差，且节理裂隙中充填方解石，为煤层气的封闭与保存提供了有利的地质条件。煤层上覆岩层较软且节理密集时容易出现低应力差，造成煤层气富集，据此预测了研究区煤层气富集区。
통과대석루북구괴암층여매층중대량적절리산상분석，전정료4투절리배투관계，병재차기출상회복료4기구조응력장특정。연구인위：본구적절리주향이NWW—NNW、NNE—NE향위주，위연산기NW—SE향화희마랍아기NE—SW향적구조응력작용하형성。다기구조응력적공동작용형성료매층대밀도할리，차매층일조주요할리방향여현대응력장최대주응력방향교위일치，촉진료매할리적장개，제고료삼투솔。매층여위암중절리산상적편차，차절리렬극중충전방해석，위매층기적봉폐여보존제공료유리적지질조건。매층상복암층교연차절리밀집시용역출현저응력차，조성매층기부집，거차예측료연구구매층기부집구。
After a mass of strata and coal seam joint occurrences analyzed in the Shilou north block, collated matching relationship be?tween 4 sets of joint, on this basis resumed 4 stages tectonic stress field characteristics. The study considered that the joint strikes in the area are mainly NWW-NNW and NNE-NE, formed under Yanshanian NW-SE and Himalayan NE-SW tectonic stress effects. Combined actions of multiple staged tectonic stresses have formed coal seam high density cleats. Direction of one set of main cleats in coal seam is more consistent with modern maximum principal stress direction, thus promoted stretching out of coal cleats and improved permeability. Deviations between joint occurrences of coal seam and country rocks, together with calcite filled into joint fissures, have provided beneficial geological conditions for sealing and preservation of CBM. Coal seam overlying strata are rather soft and low stress differences prone to appear when joints concentrated, thus caused enrichment of CBM, accordingly has predicted CBM enrichment zone in the area.