锦州25地区新生代古地温恢复研究  

A Study of Cenozoic Geothermal Recovery in Jinzhou 25 Area

作　　者：高耀[1] 郑晶[1] 曾兵[1] 林雪梅 王旭[1] 

机构地区：[1]成都理工大学,油气地质及开发工程国家重点实验室,四川成都

出　　处：《自然科学》2017年第4期365-374,共10页Open Journal of Nature Science

摘　　要：辽东湾位于渤海湾盆地东北部,是中国重要的油气产区,具有巨大的勘探潜力。本文通过现今地温场的研究,利用磷灰石裂变径迹和镜质体反射率恢复了锦州25地区的新生代热历史。研究结果表明地温梯度从38 Ma的大约36℃/km^38℃/km降低至现在的29℃/km^30℃/km,古地温演化曲线主要与所经历的埋藏史和古热流史有关。在东一段沉积末时(24.6 Ma),地层温度达到最大为110℃左右,地温梯度在24.6 Ma至17 Ma出现了较大的波动,主要因为东一段沉积期末的构造抬升所致,至东营组沉积晚期温度逐渐降低为67℃,新近纪时期的沉积使得地层逐渐升温。此外,研究成果还揭示了该区的埋藏史和热史,可以为今后的油气资源评价奠定基础。Located in the northeast of the Bohai Bay Basin, Liaodong Bay is the important oil producing area of China, with great exploration potential. Based on the present study of geothermal field, the Cenozoic thermal history in Jinzhou 25 area has been restored by apatite fission track and vitrinite reflectance. The results show that the geothermal gradient decreases from about 36?C/km - 38?C/km in 38 Ma to 29?C/km - 30?C/km nowadays, and the paleo geotemperature evolution curve is mainly related to the buried history and the ancient heat flow history. At the end of the east end of sedimentary period (24.6 Ma), the formation temperature reached a maximum of about 110 degrees, and the geothermal gradient had a great fluctuation from 24.6 Ma to 17 Ma, and the main reason is that the structural uplift in the end of the 1st Member of the Dongying Formation sedimentary period, the temperature decreased gradually to 67 degrees at the late stage of the Dongying formation sedimentary period, and the deposition of the Neogene Period has gradually increased the temperature. In addition, the study also reveals the burial history and thermal history of the area, which can lay a foundation for the evaluation of oil and gas resources in the future.

关 键 词：锦州25地区 古地温 热史 镜质体反射率 磷灰石裂变径迹 

分 类 号：P61[天文地球—矿床学]