CAJ | 학술논문

大港油田的歧口富油气凹陷形成于新生代右旋张扭应力背景下,发育北北东—北东向和北北西—东西向为主的2组断裂带,并伴生有雁行模式的帚状断裂。走滑断裂作用引起断块走滑位移量变化,使得拉张断陷作用和挤压抬升作用并存,导致沉积中心由凹陷外区向凹陷内区迁移,且与凹陷外区抬升、侵蚀作用同时发生,形成＂凹中隆＂的模式,易于形成自生自储油气藏。由走滑断裂作用形成的断裂坡折带,构成古构造单元和沉积相域的分界,并控制着沉积体系的总体展布。该文应用层序地层学的沉积体系域概念,将走滑断裂控制的沉积相类型,归为一个体系域进行分析,论述了歧口凹陷陡坡带、缓坡带、洼陷带具有良好的生、储、盖组合。结果表明,走滑断裂控制着岩性-构造圈闭的形成。
대항유전적기구부유기요함형성우신생대우선장뉴응력배경하,발육북북동—북동향화북북서—동서향위주적2조단렬대,병반생유안행모식적추상단렬。주활단렬작용인기단괴주활위이량변화,사득랍장단함작용화제압태승작용병존,도치침적중심유요함외구향요함내구천이,차여요함외구태승、침식작용동시발생,형성＂요중륭＂적모식,역우형성자생자저유기장。유주활단렬작용형성적단렬파절대,구성고구조단원화침적상역적분계,병공제착침적체계적총체전포。해문응용층서지층학적침적체계역개념,장주활단렬공제적침적상류형,귀위일개체계역진행분석,논술료기구요함두파대、완파대、와함대구유량호적생、저、개조합。결과표명,주활단렬공제착암성-구조권폐적형성。
Qikou Sag in Dagang Oilfield formed at the right lateral tensor shear background in Cenozoic,and developed two groups of fault（NNE-NE and NNW-EW trending）,accompanying echelon brush structure fault.The changes of strike-slip displacement caused by strike-slip faulting make the extension rift faulting coexist with the compression uplift and result in that the depocenter moved from outside to inside of the sag,and uplift and erosion outside of the sag occur simultaneously,which forms the model of ＂uplift in sag＂ that is easy to form self-generation and self-accumulation reservoir.The faulted slope break belts formed by strike-slip faulting constitutes the palaeostructure units and sedimen-tary facies boundary,and dominates the general depositional system distribution.Based on the concept of depositional system tract in sequence stratigraphy,the sedimentary facies controlled by strike-slip fault is analyzed under one system tract.The favorable source-reservoir-cap assemblages in actic region,gentle slope and sub-depression of Qikou Sag are discussed.The result shows that strike-slip fault controls the forming of lithologic-structural traps.