汤原断陷古近系剥蚀量恢复及原型盆地构造格局  

Denudation Restoration and Structural Framework of Prototype Paleogene Basin in Tangyuan Fault Depression

作　　者：吴景峰 蒙启安[2] 付晓飞[1] Wu Jingfeng;Meng Qi’an;Fu Xiaofei(College of Earth Sciences,Northeast Petroleum University,Daqing 163318,Heilongjiang,China;Exploration and Development Research Institute of Daqing Oilfield Company Ltd.,Daqing 163712,Heilongjiang,China)

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《吉林大学学报（地球科学版）》2020年第2期542-552,共11页Journal of Jilin University：Earth Science Edition

基　　金：国家科技重大专项(2016E-0202)。

摘　　要：汤原断陷构造复杂,后期改造强烈,原型盆地认识不清,导致原始沉积沉降中心不明确,制约了油气勘探的进展。本文从剥蚀量计算入手,分别采用镜质体反射率(R_o)法和地层趋势法,对宝泉岭组、达连河组及新安村组的地层剥蚀量进行计算,结合地震及构造特征,并利用地质建模技术恢复了不同时期的原型盆地形态,通过计算恢复认为:新安村组时期,原始厚度最厚发育在东部边界断裂下降盘,沉积沉降中心被断陷中部低凸起分为南北两个部分,此时期沉积沉降中心位于断陷东部边界断裂中段;达连河组时期,早期的两个沉积沉降中心逐渐合并为一个,断陷西部、南部出现规模较小的沉降带,最厚处依然位于东部断裂带下降盘,而沉积沉降中心迁移至东部边界断裂北段;宝泉岭组时期,早期的两个沉积沉降中心完全合并为一个,断陷西部的沉降带规模扩大,形成一东一西的两个主要沉积沉降中心,沉积沉降中心由一个变为两个。在此基础上,明确了原型盆地格局形态及不同时期沉积沉降中心分布及迁移过程。The structure of Tangyuan fault depression is complex,and its transformation is strong,which leads to the uncertainty of the original sedimentary subsidence center,and this, in turn, restricts the progress of oil and gas exploration. Starting from the calculation of denudation amount by using the stratigraphic trend method and the vitrinite reflectance method, the authors obtained the amount of stratum denudation of Baoquanling Formation,Dalianhe Formation, and Xin’ancun Formation, and restored the shape of the prototype basin in different periods combined with earthquake and structural features and the geological modeling technology. Through the calculation and recovery,it is considered that during Xin’ancun Formation period,the thickest part was in the eastern boundary,and the eastern sedimentary zone was formed by the influence of paleo-tectonics, and was divided by the middle uplift into two parts,the north and the south,the subsidence center was located in the middle section of the fault in the eastern boundary. During the Dalianhe Formation period,the two early subsidence zones gradually merged into one zone, the north of the eastern boundary,with some small subsidence zones in the west and south of the fault depression, and the thickest part was still located in the descending plate of the eastern fault zone. During the Baoquanling Formation period,the two early(eastern?) subsidence zones were completely merged into one zone,and the subsidence zone in the western part of the fault depression was formed and enlarged,thus the east and west subsidence centers were formed.On the above,the pattern of prototype basin,the distribution,and migration process of the sedimentation centers in different periods are finally clarified.

关 键 词：汤原断陷 剥蚀量恢复 原型盆地 构造格局 

分 类 号：TE121.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]