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川东南地区志留系油气成藏主控要素分析

ISSN号：1006-7981
期刊名称：《内蒙古石油化工》
时间：0
分类：P314[天文地球—固体地球物理学;天文地球—地球物理学]
作者机构：[1]中国石化石油勘探开发研究院构造与沉积储层实验室,北京100083, [2]中国地质大学(武汉)构造与油气资源教育部重点实验室,武汉430074, [3]中国石化石油勘探开发研究院,北京100083
相关基金：国家自然科学基金重点项目（40739904）、国家自然科学基金面上项目（41072093）、国家自然科学基金青年科学基金项目（41302117）; 国家“十一五”科技重大专项（2011ZX05005-002）; 中国石化勘探南方分公司合作项目（G0800-12-ZS-066）联合资助

作者：张荣强[1], 肖开华[1], 汪新伟[1], 李双建[1], 周雁[1], 沃玉进[1]

关键词：裂变径迹, (U-Th), He, 镜质体反射率, 盆地模拟, 构造-热演化史, 簰洲湾, 中扬子江汉平原, Fission track, （U-Th）/He, Vitrinite reflectance, Basin modeling, Tec-thermal, Paizhouwan Region, Jianghan Plain

中文摘要：

本文综合运用磷灰石-锆石裂变径迹和（U-Th）/He、镜质体反射率及盆地模拟等手段,深入细致地探讨了中扬子江汉平原簰洲湾地区中、新生代构造-热史演化过程.研究结果表明,研究区中—新生代大规模构造抬升剥蚀、地层冷却事件始于早白垩世（140—130 Ma）;大规模抬升冷却过程主要发生在早白垩世中后期至晚白垩世.研究区虽然可能存在一定厚度的晚白垩世—古近纪地层沉积,总体沉积规模相对较小.综合分析认为,区内应该存在较大厚度的中侏罗统或/和上侏罗统乃至早白垩世地层的沉积;而现今残存中生代中、上侏罗统地层相对较薄,主要是由于后期持续构造抬升剥蚀造成的,估计总剥蚀厚度约4300 m左右.区内中生代地层在早白垩世达到最大古地温,而不是在古近纪沉积末期;上三叠统地层最大古地温在170~190℃之间.热史分析结果表明,区内古生代古热流相对稳定,平均热流在53.64 mW·m-2;早侏罗世末期古热流开始降低,在早白垩世初期古热流约为48.38 mW·m-2.

英文摘要：

In this paper,apatite and zircon fission track and（U-Th）/He dating,vitrinite reflectance analysis and basin modeling are carried out,for more clearly understanding the tectonic and thermal history during the Mesozoic and Cenozoic era of the Paizhouwan area,eastern Jianghan Basin.The analysis results show that the enormous tectonic uplift,erosion,and formation cooling event during the Mesozoic and Cenozoic began at the early Cretaceous（140-130 Ma）;the intense tectonic uplift-cooling process mainly occurred during the early Cretaceous to the Late Cretaceous.While there may be some sediments of the Late Cretaceous-Paleogene period,the overall deposition thickness is relatively small.There should be large-scale sediments deposited during the Middle Jurassic or/and Upper Jurassic and even the early Cretaceous.The present-day remnant is thin,mainly due to the later successive erosion for which the total estimated denudation thickness is about 4300 m.The Mesozoic strata in the studied area reached the maximum paleotemperature in the Early Cretaceous,rather than at the Paleogene sedimentary final,the maximum temperature of the Upper Triassic is about 170~190℃.The thermal history results also show that the ancient heat flow is relatively stable during the Paleozoic era.The average value of the heat flow is about 53.64 mW ？ m~（-2）;the heat flow began to decrease at the early Jurassic,and the lowest is about 48.38 mW ？ m~（-2） happened during the beginning of the early Cretaceous approximately.

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