CAJ | 학술논문

镜质组反射率(Ro)的大小取决于有机质受热温度和受热时间,因此,根据Ro可以重构有机质热历史。在勘探程度较低时,恢复热史的常规模型和方法存在较大的缺陷,相比之下,EASY%Ro化学动力学模型更能真实地再现有机质所经历的热史,尤其是在Ro值大于0.9%的中、高成熟演化阶段应用效果更佳。鉴于此,利用EASY%Ro模型,同时结合镜质组反射率资料,对塔里木盆地库车坳陷依南2井、雅布赖盆地雅参1井和酒西盆地窿101井进行了热史模拟。研究结果表明,自中生代以来,库车坳陷古地热梯度总体上呈降低趋势,相对较明显的降温过程与晚第三纪快速埋藏过程相对应。雅参1井和窿101井的古地热梯度偏低,并且变化不大,不利于有机质生烃。镜质组反射率测定值的差异性可能是导致依南2井热史模拟计算的古地热梯度高于前人研究结果的主要原因。图4表4参5 (魏志彬摘)
경질조반사솔(Ro)적대소취결우유궤질수열온도화수열시간,인차,근거Ro가이중구유궤질열역사。재감탐정도교저시,회복열사적상규모형화방법존재교대적결함,상비지하,EASY%Ro화학동역학모형경능진실지재현유궤질소경력적열사,우기시재Ro치대우0.9%적중、고성숙연화계단응용효과경가。감우차,이용EASY%Ro모형,동시결합경질조반사솔자료,대탑리목분지고차요함의남2정、아포뢰분지아삼1정화주서분지륭101정진행료열사모의。연구결과표명,자중생대이래,고차요함고지열제도총체상정강저추세,상대교명현적강온과정여만제삼기쾌속매장과정상대응。아삼1정화륭101정적고지열제도편저,병차변화불대,불리우유궤질생경。경질조반사솔측정치적차이성가능시도치의남2정열사모의계산적고지열제도고우전인연구결과적주요원인。도4표4삼5 (위지빈적)
The vitrinite reflectance (Ro) depends on the temperature and time organic matter undergone in the geological history. Thermal history of organic matter, therefore, can be reconstructed from Ro value. The conventional models and methods to restore thermal history exit many limitations in the early exploration of a basin. On the contrary, the chemical kinetic model of EASY%Ro may exactly reflect the authentic information of thermal history. It is, especially, suitable for the medium to high stages of thermal evolution (Ro>0.9%) , while the paleogeothermal gradients will be underestimated in the low level of thermal stage. For this reason, the paleo-heat histories organic matter experienced in the three wells, such as Well YN-2 of Kuqa depression, Tarim basin, Well YC-1 of Yabulai basin and Well Long-101 of Jiuxi basin, were simulated with EASY%Ro, combining the data of vitrinite reflectance. The results of modeling suggest that, the paleogeothermal gradients take the trend of decrease since Mesozoic in Kuqa depression, Tarim basin, and this relatively remarkable temperature drop conforms to the rapid burial in late Tertiary. Also, it is shown that, compared with Well YN-2, the paleogeothermal gradients of Well YC-1 and Well Long-101 with a little variation tend to be lower, which is unfavorable to the hydrocarbon generation. The paleogeothermal gradients of Well YN-2 are higher than the previous results, which may be resulted from the measurement difference of vitrinite reflectance.