CAJ | 학술논문

鄂尔多斯盆地浅水三角洲沉积体系与盆地内三叠系其它开发层系沉积微相的微观特征差异不大，主要区别在于宏观尺度上。以马岭长8油藏为例，采用基于高分辨率层序地层学原理的小层砂层划分对比方法，建立在沉积学基础上的沉积微相以及砂体展布研究，同时采用了较为实用的参数计算方法，对宏观非均质性进行定性－定量表征。结果表明：该类浅水三角洲沉积体系形成的储层在层间、层内和平面上均表现出特有的强非均质性特征。最后对形成原因做了深入研究，认为浅水三角洲沉积体系形成的分流河道频繁改道分叉及侧向迁移，使砂体展布呈网状交织或串珠状展布，这是强非均质性形成的主因，成岩作用和局部微裂缝为次因。
악이다사분지천수삼각주침적체계여분지내삼첩계기타개발층계침적미상적미관특정차이불대，주요구별재우굉관척도상。이마령장8유장위례，채용기우고분변솔층서지층학원리적소층사층화분대비방법，건립재침적학기출상적침적미상이급사체전포연구，동시채용료교위실용적삼수계산방법，대굉관비균질성진행정성－정량표정。결과표명：해류천수삼각주침적체계형성적저층재층간、층내화평면상균표현출특유적강비균질성특정。최후대형성원인주료심입연구，인위천수삼각주침적체계형성적분류하도빈번개도분차급측향천이，사사체전포정망상교직혹천주상전포，저시강비균질성형성적주인，성암작용화국부미렬봉위차인。
Taking Chang 8 reservoir in Maling Oilfield as an example,sedimentary microfacies and sandbody distribu-tion based on sedimentology were studied by using the division and correlation method of small layer sands based on the principle of high resolution sequence stratigraphy.Meanwhile,macroscopic heterogeneity was expressed quantitatively and qualitatively by the practical parameter calculation method.The result revealed that the reservoir formed in the shallow -water delta depositional system shows unique strong heterogeneity in the interlayer,layer and plane.This was mainly ex-plained by the sandbodies with meshy interweaved or beaded distribution caused by frequently diverted bifurcation and lat-eral migration of distributary channel,which was formed in shallow -water delta sedimentary system.The diagenesis and the local micro -cracks was a secondary cause.