CAJ | 학술논문

利用岩石力学参数计算页岩地层脆性指数其结果存在不确定性，而由矿物组成得到的结果不能反映地层的实际脆性。为此，在用矿物组分计算地层脆性的基础上，引入断裂韧度作为每种矿物的加权系数，建立了页岩地层脆性指数评价新模型。用页岩地层的岩石力学模型、脆性矿物模型和建立的新模型分别计算了某井页岩地层的脆性指数，并对其结果进行了对比。结果发现，在岩石力学参数异常段，新模型的评价结果比岩石力学模型高10％左右，且评价结果与压裂效果一致。研究表明，新模型的脆性指数与断裂韧度之间呈负线性关系，地层断裂韧度越大，则脆性指数越小，反之亦然。分析认为，该模型有效避免了单一矿物含量模型带来的缺陷，同时新模型与页岩地层的含气量和有机质含量无关，对页岩地层来说是一种高效的模型。
이용암석역학삼수계산혈암지층취성지수기결과존재불학정성，이유광물조성득도적결과불능반영지층적실제취성。위차，재용광물조분계산지층취성적기출상，인입단렬인도작위매충광물적가권계수，건립료혈암지층취성지수평개신모형。용혈암지층적암석역학모형、취성광물모형화건립적신모형분별계산료모정혈암지층적취성지수，병대기결과진행료대비。결과발현，재암석역학삼수이상단，신모형적평개결과비암석역학모형고10％좌우，차평개결과여압렬효과일치。연구표명，신모형적취성지수여단렬인도지간정부선성관계，지층단렬인도월대，칙취성지수월소，반지역연。분석인위，해모형유효피면료단일광물함량모형대래적결함，동시신모형여혈암지층적함기량화유궤질함량무관，대혈암지층래설시일충고효적모형。
Some uncertainties exist in shale brittleness index evaluation by using rock mechanics pa -rameters .While it cannot present actual formation brittleness by using mineral content .A new evaluation model for shale brittleness was established based on conventional calculation method using mineral content and integrating fracture toughness as weighing coefficient for each mineral .In this paper ,the new model , rock mechanical model and mineral content model were compared .It was found that ,for an interval with abnormal rock mechanics properties ,the new model provided a result aproximately 10% higher than the rock mechanical model and consistent with the stimulation results .Moreover ,a negative linear relationship existes between fracture toughness and brittleness index-higher fracture toughness ,lower brittleness in-dex ,and vice versa .Analysis showed that the new model avoided the defects of single mineral content mod-el and was irrelevant to gas and organic materials in shale formation .Therefore ,the new model is efficient for shale formation evaluation .