海拉尔盆地塔木兰沟组剥蚀量恢复及原型盆地构造格局  

Denudation restoration of Tamulangou Formation in Hailaer Basin and structural framework of prototype basin

作　　者：刘志文[1] 侯艳平[1] 陈鸿平[1] 申文静[1] LIU Zhiwen;HOU Yanping;CHEN Hongping;SHEN Wenjing(Research Institute of Exploration and Development,Daqing Oil Field Co.Ltd.,CNPC,Daqing 163712,Heilongjiang)

机构地区：[1]中国石油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：《长江大学学报（自然科学版）》2021年第6期1-8,共8页Journal of Yangtze University(Natural Science Edition)

基　　金：中国石油天然气股份有限公司重大科技专项“大庆油气持续有效发展关键技术研究与应用”(2016E-0202)。

摘　　要：海拉尔盆地塔木兰沟组构造复杂,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。从剥蚀量计算入手,采用地层趋势法,对塔木兰沟组的地层剥蚀量进行计算,结合地震及构造特征,利用Sufer软件恢复了不同时期的原型盆地形态,发现地层原始厚度的展布特征与残留特征基本一致,最大的区别是分布范围。塔木兰沟组归属于侏罗纪,根据构造属性和盆地沉积充填特征,侏罗纪盆地原型可分为前陆褶皱冲断盆地和伸展盆地2个阶段:早中侏罗世,盆地遭受来自西部的蒙古鄂霍茨克洋闭合和碰撞的挤压作用与东部古太平洋板块平板俯冲的挤压作用,盆地基底与中古生界发生大规模褶皱冲断作用,形成宽阔连片的褶皱冲断带;晚侏罗世,古太平洋板块由平板俯冲转为回撤,对东亚大陆的作用也由挤压转为伸展,蒙古鄂霍茨克洋闭合后,板片发生断离,诱发增厚的地壳垮塌;两者的联合作用,导致海拉尔盆地及其周缘由挤压环境进入裂陷期,早期深大断裂与逆冲褶皱体系解体、反转,沉积了断层火山联合控制的塔木兰沟组。The structure of Tamulangou Formation in Hailaer Basin is complex,and the later transformation is strong,and the recognition of prototype basin is unclear,which leads to the unclear original sedimentary settlement center and thus restricts the development of oil and gas exploration.Starting with the calculation of denudation amount,the stratum trend method was adopted to calculate the stratigraphic denudation amount of Tamulangou Formation.Combined with the seismic and structural characteristics,the prototype basin shape of different periods was restored by using the software of Sufer.Through the restoration,it is concluded that the distribution characteristics of the original thickness of the formation are basically the same as the residual ones,and the biggest difference is the distribution range.The Tamulangou Formation belongs to Jurassic.According to the structural properties and the sedimentary filling characteristics of the basin,the Jurassic basin prototype can be divided into two stages:foreland fold thrust basin and extensional basin.In the early and middle Jurassic,the basin was subjected to the compression of closure and collision of Mongolia Okhotsk Ocean from the West and the compression of subduction of Paleopacific plate from the east.Large-scale fold thrust was subjected between the basin basement and the Middle Paleozoic,forming a wide and continuous fold thrust zone.In the late Jurassic,the Paleopacific plate changed from flat subduction to retreat,and its effect on the East Asia continent also changed from compression to extension;After the closure of the Mongolian Okhotsk Ocean,the plate was fractured induced the collapse of the thickened crust;The combined action of the two resulted in the entering of Hailaer Basin and its periphery from compression environment to rifting stage.The early deep faults and thrust fold system disintegrated and reversed,and the Tamulangou Formation controlled by fault and volcano was deposited.

关 键 词：海拉尔盆地 塔木兰沟组 剥蚀量恢复 原型盆地 

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]