利用磷灰石裂变径迹法研究鄂尔多斯盆地地热史  

THERMAL HISTORY OF ORDOS BASIN ASSESSED BY APATITE FISSION TRACK ANALYSIS

作　　者：任战利[1] 

机构地区：[1]西北大学含油气盆地研究所

出　　处：《地球物理学报》1995年第3期339-349,共11页Chinese Journal of Geophysics

基　　金：国家"八五"重点科技攻关项目

摘　　要：本文应用磷灰石裂变径迹法研究了鄂尔多斯盆地的热历史．不同构造单元的磷灰石裂变径迹分析资料表明：在中生代晚期，地温梯度为３．３－４．１℃／１００ｍ，大地热流值为８１－９５ｍＷ／ｍ２，高于盆地现今的平均地温梯度（２．８０℃／１００ｍ）及平均大地热流值（６３ｍＷ／ｍ２）．这次热事件有利于油气的生成、运移及大气田的形成．另外，在２０－２３Ｍａ前，发生了一期显著的冷却事件．In this paper the thermal history of the Ordos basin has been analysed with the method of apatite fission track analysis.the data of apatite fission track in different structural units show that the palaeotemperature gradient(3.3-4.1℃/100m)and heat flow(81-95mW/m2)in the late Mesozoic is higher than present gradient(2.80℃/100m)and heat flow(63mW/m2).This thermal event was favourable for gas generation and migration and for giant gas field formation.Apatite fission track data show that there was a cooling event which occurred 20-23Ma ago.

关 键 词：鄂尔多斯盆地 磷灰石 裂变径迹 地热史 

分 类 号：P314.2[天文地球—固体地球物理学]