松辽裂陷盆地反转期构造分析  

An analysis of tectonic inversion in Songliao basin

作　　者：张文军[1] 胡望水[1] 官大勇[1] 毛治国[1] 王筱楠[2] 

机构地区：[1]长江大学地球科学系 [2]泰安卫校外语教研室

出　　处：《中国海上油气（工程）》2004年第4期230-234,共5页China Offshore Oil and Gas

摘　　要：在裂陷作用和伸展型拗陷作用停止的同时 ,松辽盆地基底发生了反转型差异拗陷作用 ,拗陷作用经历了弱—强—弱—停止的演化过程 ,在四方台组和明水组沉积期达到极点 ,形成了反转期构造层 ;第四系沉积差异隆升致反转作用停止 ,沉积了反转期后构造层。松辽盆地正反转构造发育经历了 4个阶段 :裂陷、拗陷终止和缓慢反转 ;快速反转和快速差异拗陷 ;慢速反转和慢速差异拗陷 ;反转停止和拗陷终止。正反转构造发育演化的结果是在中下构造层 (即“下断中坳”)之上形成“上隆顶平”的盆地结构。这种四元结构的形成 ,起因于区域构造应力场转变成裂陷作用、拗陷作用和差异隆升反转作用的演化。利用生长构造分析、基底沉降史回剥、热沉降模拟和反转构造恢复相结合的研究方法揭示 ,“上隆”部分沉积 6 9%的可容纳空间来源于下伏沉积物的压实 ,31%的可容纳空间来源于盆地基底的受压拗陷。When the rifting and extensional sagging stopped, a differential inversion sagging occurred on the basement of Songliao basin. This differential sagging experienced a long period of weak-strong-weak-stop evolution, and the sagging peak was during the sedimentation of Sifangtai and Mingshui Formation, forming a tectonic inversion horizon. A differential uplifting during Quartary has stopped the inversion, and a post-inversion horizon has deposited. For Songliao basin, there are four tectonic stages:(1)rifting, sagging termination and slow inversion; (2)rapid inversion and differential sagging; (3)slow inversion and differential sagging; and (4)inversion and sagging termination. This tectonic development and evolution have resulted in a basin architecture of “basement upwarping-top flattening”above the middle-lower tectonic horizons(i.e. lower rifting-middle sagging). This four-element architecture may be caused by a regional stress field evolution from rifting, sagging to differential inversion uplifting. By analyzing growth structures, backstripping basement subsidence history, simulating thermal subsidence and restoring inverted structures, it has been indicated that 69% of sedimentary accommodation in the “upwarping” part come from sediment compaction and the rest 31% from compressional sagging of basin basement.

关 键 词：可容纳空间 隆升 构造层 基底 裂陷盆地 松辽盆地 第四系 停止 作用 差异 

分 类 号：TE121.1[石油与天然气工程—油气勘探] P618.130.2[天文地球—矿床学]