CAJ | 학술논문

受多期次构造应力场叠加转变的影响，迈陈凹陷东部断裂发育具有明显的阶段性，平面上断裂走向在古新统和始新统以NE向为主，渐新统转变为EW和NEE向，剖面上以T4反射层(涠州组底)为界可以划分为上下两套断裂系统，上下两套断裂系统继承与改造并存。针对这一问题，在地震、钻井岩心和区域地质背景资料分析解释的基础上，对迈陈凹陷东部断裂系统的发育演化进行构造物理模拟实验正演分析。实验结果表明：迈陈凹陷东部在古新世—中始新世主要受控于NW向伸展应力场，以NE向断裂发育为主；晚始新世在NW向拉张的同时叠加了右旋剪切作用，近EW向断裂开始发育，部分早期发育的NE向断裂继承性活动。
수다기차구조응력장첩가전변적영향，매진요함동부단렬발육구유명현적계단성，평면상단렬주향재고신통화시신통이NE향위주，점신통전변위EW화NEE향，부면상이T4반사층(위주조저)위계가이화분위상하량투단렬계통，상하량투단렬계통계승여개조병존。침대저일문제，재지진、찬정암심화구역지질배경자료분석해석적기출상，대매진요함동부단렬계통적발육연화진행구조물리모의실험정연분석。실험결과표명：매진요함동부재고신세—중시신세주요수공우NW향신전응력장，이NE향단렬발육위주；만시신세재NW향랍장적동시첩가료우선전절작용，근EW향단렬개시발육，부분조기발육적NE향단렬계승성활동。
Influenced by the superimposition and transformation of multiple phrases of tectonic stress field, the development of the eastern fault system displays apparent periodicity in Maichen sag. On the plane view, the fault strike was mainly NE tren-ding in Paleocene and Eocene, and changed to EW and NEE in Oligocene. On the seismic section, taking T4 reflecting sur-face ( the bottom boundary of Weizhou Formation) as a boundary, the fault system can be divided into the upper system and the lower system, between which inheritance and transformation coexist. Aiming at this problem, based on the analysis of seismic data, drilling cores, and regional geological background, structure physical simulations were performed to model the eastern fault system°s evolution in Maichen sag. The results show that the eastern area of Maichen sag was mainly controlled by the NW tensional stress from Paleocene to Middle Eocene, and the fault strike was mainly NE trending. In the late Eo-cene, dextral shearing was superimposed on the NW tensional stress, which contributed to the development of the EW-tren-ding faults,and some of those early developed NW-trending faults act successively.