CAJ | 학술논문

鸡西盆地煤炭资源丰富，其南部的梨树镇坳陷城子河组厚度大，含煤性好，是煤层气勘探开发的重点区域。为了解该区煤岩物理力学特性，选取城子河组23#煤层岩样进行实验研究。通过测定岩样的泊松比、弹性模量、内聚力以及内摩擦角等力学参数，确定该层煤岩具有低弹性模量、高泊松比和大脆性的特性。分析煤岩物性参数得出：随着应力增加，煤岩渗透率呈指数下降，不利于煤层气的开采，而温度对煤岩渗透率影响较小；煤岩的孔隙度主要集中在3.6%～6.1%，平均约4.98%，程度偏低，中孔和小孔比较发育；低阶煤和中阶煤煤样的排驱压力相差较大，中阶煤煤样压力值较小，渗透性好；结合中值半径和退汞效率的实验数据，显示该区煤储层的渗透性整体较差。
계서분지매탄자원봉부，기남부적리수진요함성자하조후도대，함매성호，시매층기감탐개발적중점구역。위료해해구매암물리역학특성，선취성자하조23#매층암양진행실험연구。통과측정암양적박송비、탄성모량、내취력이급내마찰각등역학삼수，학정해층매암구유저탄성모량、고박송비화대취성적특성。분석매암물성삼수득출：수착응력증가，매암삼투솔정지수하강，불리우매층기적개채，이온도대매암삼투솔영향교소；매암적공극도주요집중재3.6%～6.1%，평균약4.98%，정도편저，중공화소공비교발육；저계매화중계매매양적배구압력상차교대，중계매매양압력치교소，삼투성호；결합중치반경화퇴홍효솔적실험수거，현시해구매저층적삼투성정체교차。
The Jixi Basin has abundant coal resources;the Chengzihe Formation in the Lishuzhen depression in southern part of the ba?sin has large thickness, good coal-bearing property, thus a key area to exploit CBM. To find out coal and rock physical and mechanical characteristics, taking the samples from the coal No.23 carried out experimental study. Through rock sample mechanical parameters set?ting out Poisson’s ratio, elastic modulus, cohesion and internal friction angle, determined coal and rock in the seam have characteris?tics of low elastic modulus, high Poisson’s ratio and high brittleness. The coal and rock sample physical parameters setting out find out that along with stress increasing, permeability presents exponential lowering, thus unfavorable for CBM exploitation, while temperature impact less on permeability. Porosity of coal and rock is mainly concentrated between 3.6%~6.1%, average about 4.98%, on the low side, medium and small pores relatively developed. Displacement pressures of low and medium rank coal samples have large differ?ence;medium rank coal samples have smaller pressure values with good permeability. Combined with experimental data of median radi?us and efficiency of mercury withdrawal, have indicated rather poor permeability of coal reservoir in the area as a whole.