CAJ | 학술논문

沁水盆地是华北克拉通内的构造盆地,是天然气勘探的潜在重要区域,盆地的热史研究是天然气储层评价的重要基础.重点应用磷灰石裂变径迹的分析与模拟,配合镜质体反射率的分析与模拟以及区域构造地质背景分析,恢复了沁水盆地的古地温梯度和地热演化模型:早古生代地温梯度稳定,为3 ℃/100 m,晚二叠世至三叠纪地温梯度较前期略有降低,约为2.5～3.0 ℃/100 m;早、中侏罗世地温梯度开始上升,约为3.0～4.0 ℃/100 m;晚侏罗世-早白垩世地温梯度大幅度上升,为4.5～6.5 ℃/100 m;晚白垩世至古近纪早、中期为高地温场的延续时期,地温梯度为5.5～6.5 ℃/100 m;古近纪晚期-新近纪早期地温梯度大幅度降低,从6.0 ℃/100 m骤降至4.2 ℃/100 m左右;中新世以来地温场逐渐趋于稳定,地温梯度由4 ℃/100 m演变到接近现代地温场的3 ℃/100 m左右.
심수분지시화북극랍통내적구조분지,시천연기감탐적잠재중요구역,분지적열사연구시천연기저층평개적중요기출.중점응용린회석렬변경적적분석여모의,배합경질체반사솔적분석여모의이급구역구조지질배경분석,회복료심수분지적고지온제도화지열연화모형:조고생대지온제도은정,위3 ℃/100 m,만이첩세지삼첩기지온제도교전기략유강저,약위2.5～3.0 ℃/100 m;조、중주라세지온제도개시상승,약위3.0～4.0 ℃/100 m;만주라세-조백성세지온제도대폭도상승,위4.5～6.5 ℃/100 m;만백성세지고근기조、중기위고지온장적연속시기,지온제도위5.5～6.5 ℃/100 m;고근기만기-신근기조기지온제도대폭도강저,종6.0 ℃/100 m취강지4.2 ℃/100 m좌우;중신세이래지온장축점추우은정,지온제도유4 ℃/100 m연변도접근현대지온장적3 ℃/100 m좌우.
The Qinshui Basin within the North China Craton is a potential area for natural gas exploration,and thus the thermal history is a key to evaluate the reservation of the natural gas in this basin.Using apatite fission track and vitrinite reflection modelling techniques,the thermal history of the Qinshui Basin in Shanxi Province was modelled.The temperature gradients of the Qinshui Basin changed with geological stages:3 ℃/100 m at Early Palaeozoic,2.5-3.0 ℃/100 m from Late Permian through Triassic,3.0-4.0 ℃/100 m at Early-Middle Jurassic,4.5-6.5 ℃/100 m at Late Jurassic-Early Cretaceous,5.5-6.5 ℃/100 m at Late Cretaceous to Palaeogene,6.0 ℃/100 m at Late Palaeogene and 4.2 ℃/100 m at Early Neogene.Since Miocene to the present,the temperature gradient kept relatively stable at 3 ℃/100 m.