CAJ | 학술논문

以裂缝在古应力场中产生、在现今应力场被改造为研究路线,以应变能、表面能理论为基础,选用库伦-莫尔准则及格里菲斯准则分别作为岩石剪性及张性破裂判据,建立造缝期古应力场及现今应力场三向挤压应力状态及有张应力存在情况下裂缝参数计算模型,并用此模型进行实例分析计算.结果表明:现今应力场中难以产生裂缝,裂缝体积密度、线密度与古裂缝相同,现今裂缝开度及渗流性能受作用在裂缝面上的正应力及剪应力影响,相比古裂缝参数有明显变化;石港油田阜二段断层附近为储层裂缝发育密集区,裂缝开度、孔隙度及渗透率等参数高值区主要位于靠近断层的构造高部位.
이렬봉재고응력장중산생、재현금응력장피개조위연구로선,이응변능、표면능이론위기출,선용고륜-막이준칙급격리비사준칙분별작위암석전성급장성파렬판거,건립조봉기고응력장급현금응력장삼향제압응력상태급유장응력존재정황하렬봉삼수계산모형,병용차모형진행실례분석계산.결과표명:현금응력장중난이산생렬봉,렬봉체적밀도、선밀도여고렬봉상동,현금렬봉개도급삼류성능수작용재렬봉면상적정응력급전응력영향,상비고렬봉삼수유명현변화;석항유전부이단단층부근위저층렬봉발육밀집구,렬봉개도、공극도급삼투솔등삼수고치구주요위우고근단층적구조고부위.
Tectonic fracture occurred in palaeostress field and was modified in current stress field. The calculation model of fracture parameter in fracture building stage, palaeostress field and current stress field in triaxial compression state and extension stage, was developed based on strain energy and surface energy theory. The Coulumb-Mohr principle was applied to examination of shear fracture, while Griffith principle was applied to examination of tension fracture. The results show that the rocks hardly burst in current stress field. The volume density and linear density of current fracture are same with those of palaeofracture, while the aperture and seepage of fracture change significantly. The current fracture parameters are affected by positive stress and shear stress on the fracture surface. The Fuer segment reservoir fractures in Shigang Oilfield mainly distribute near the faults. The high value area of aperture, porosity and permeability of fractures is in the structural high situs near the faults.