丽水-椒江凹陷原盆面貌恢复及地质意义  

Restoration of the original basin of Lishui-Jiaojiang Sag and its geological significance

作　　者：唐友军[1,2] 陈培[1,2] 陈忠云 蔡俊 覃军[3] 张增胜 湛君明 TANG Youjun;CHEN Pei;CHEN Zhongyun;CAI Jun;QIN Jun;ZHANG Zengsheng;ZHAN Junming(Hubei Key Laboratory of Petroleum Geochemistry and Environment(Yangtze University),Wuhan 430100,Hubei;Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education(Yangtze University),Wuhan 430100,Hubei;Shanghai Branch,CNOOC Limited(China),Shanghai 200335;School of Geosciences,Yangtze University,Wuhan 430100,Hubei)

机构地区：[1]油气地球化学与环境湖北省重点实验室(长江大学),湖北武汉430100 [2]油气资源与勘探技术教育部重点实验室(长江大学),湖北武汉430100 [3]中海石油(中国)有限公司上海分公司,上海200335 [4]长江大学地球科学学院,湖北武汉430100

出　　处：《长江大学学报（自然科学版）》2023年第2期20-28,F0003,共10页Journal of Yangtze University(Natural Science Edition)

基　　金：国家自然科学基金项目“苯基多环芳烃检测及其石油地球化学意义”(41972148)。

摘　　要：丽水-椒江凹陷古近系月桂峰组、灵峰组下段及灵峰组上段受到后期构造隆升影响,3套主力烃源岩层段西部改造破坏严重,导致原始沉积厚度与原始边界范围认识不清,制约了资源量的客观评价。以恢复原型盆地为思路,结合地震剖面、钻井、沉积相等资料,利用趋势厚度法恢复出月桂峰组、灵峰组下段和灵峰组上段原始沉积厚度与原始边界,月桂峰组原始沉积范围边界向西延伸距离平均4.0 km,灵峰组下段原始沉积范围边界向西延伸距离平均9.7 km,灵峰组上段原始沉积范围边界向西延伸距离平均8.3 km。依据剥蚀地层、盆地基底结构、残留厚度沉积相图,编制出月桂峰组—灵峰组上段沉积期构造古地理图。验证了古新世早期月桂峰组、灵峰组下段及灵峰组上段均为断陷盆地,月桂峰组为湖相沉积,灵峰组下段与灵峰组上段为海相沉积,有助于深化对丽水-椒江凹陷原盆面貌的认识,为该区的油气勘探工作提供了有益的参考。Under the influence of late tectonic uplift,the western part of the three main source rock segments of the Paleogene Yueguifeng Formation,the lower member of Lingfeng Formation and the upper member of Lingfeng Formation in Lishui-Jiaojiang Sag was seriously damaged by the reconstruction,which led to the unclear understanding of the original sedimentary thickness and the original boundary range,and restricted the objective evaluation of the resource quantity.In this paper,based on the idea of restoring the original basin,combined with seismic profile,drilling and sedimentary facies data,the trend thickness method was used to restore the original sedimentary thickness and original boundary of Yueguifeng Formation,the lower member of Lingfeng Formation and upper member of Lingfeng Formation.The average westward extension distance of the original sedimentary range boundary of Yueguifeng Formation is 4.0 km,the average westward extension distance of the original sedimentary range boundary of the lower member of Lingfeng Formation is 9.7 km,and the average westward extension distance of the original sedimentary range boundary of the upper member of Lingfeng Formation is 8.3 km.Based on the denudation strata,basement structure of the basin and the sedimentary facies diagram of the residual thickness,the tectonic paleogeography map of the sedimentary period of the upper member of the Yueguifeng Formation and Lingfeng Formation was compiled.It is proved that the early Paleocene Yueguifeng Formation,the lower member of Lingfeng Formation and the upper member of Lingfeng Formation are all faulted basins,the Yueguifeng Formation is lacustrine sedimentary,while the lower member of Lingfeng Formation and the upper member of Lingfeng Formation are marine sedimentary,which is helpful to deepen the understanding of the original basin features of Lishui-Jiaojiang Sag,and provide a useful reference for oil and gas exploration in this area.

关 键 词：原始盆地 沉积范围边界 西部边界 剥蚀厚度 

分 类 号：P548[天文地球—构造地质学]