江汉盆地当阳复向斜当深3井热史恢复及其油气勘探意义  

THERMAL HISTORY RECONSTRUCTION FOR WELL DANGSHEN 3 IN THE DANGYANG SYNCLINORIUM, JIANGHAN BASIN AND ITS EXPLORATION IMPLICATIONS

作　　者：郭彤楼[1] 李国雄[1] 曾庆立[2] 

机构地区：[1]中国石油化工股份有限公司南方勘探开发分公司,昆明650200 [2]中国石油化工股份有限公司江汉石油勘探局勘探开发研究院,湖北荆州433124

出　　处：《地质科学》2005年第4期570-578,共9页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国石油化工股份有限公司南方勘探开发分公司和国家自然科学基金(No.40172100)资助课题。

摘　　要：江汉盆地当阳复向斜当深3井实测地温剖面和样品热导率测试结果表明:其现今地温梯度为20～24℃/km,热流值为56mW/m2,体现了盆地发育于扬子稳定陆块的大地构造属性。基于7个磷灰石裂变径迹样品和大量镜质体反射率古温标数据进行的热史恢复表明,盆地构造—热演化经历了前印支期的低热流(50～60mW/m2)和小剥蚀量(50～200m),印支期的高热流(约80mW/m2)及燕山期与喜马拉雅期的低热流(50～60mW/m2)与大剥蚀量(1100～2400m)的不同演化阶段,反映了盆地和区域构造演化过程的阶段性。受沉积剥蚀及盆地构造—热演化的控制,生油岩系的生烃阶段与过程具有多期次的特征。From the borehole temperature log and thermal conductivity measurements of core samples from the Well Dangshen 3 in the Dangyang synclinorium, Jianghan Basin, the present temperature gradient and heat flow were 20 - 24 ℃/kin and 52 mW/m^2 , indicating the stable tectonic nature of the Yangtze craton. Based on 7 apatite fission track data and a number of vitrinite reflectance data, the thermal history reconstruction showed that the basin experienced the earlier low heat flow （52 mW/m^2） and limited erosion （50 -200 m） during the pre-Indosinian period, higher heat flow （ - 80mW/m^2） in the Indosinian orogeny and low heat flow （50 - 60 mW/m^2） and significant erosion （1 100 - 2 400 m） during the Yanshanian and Himalayan periods, which was related with the basin and the regional tectono-thermal evolution. Controlled by the deposition and erosion as well as the basin thermal evolution, the hydrocarbon generation was of multi-phases.

关 键 词：热流值 热历史 烃源岩热演化 当阳复向斜 江汉盆地 

分 类 号：P314[天文地球—固体地球物理学]