CAJ | 학술논문

通过地震、钻井、测井资料详细分析，迈陈凹陷新生代可划分为陆相断陷、海相坳陷演化阶段，其中断陷阶段始新世流沙港期至渐新世涠洲期存在着构造格局的转变，即凹陷构造格局由北东向转型为近东西向。迈陈凹陷构造对地层沉积具有明显控制作用，一方面流沙港期地层沉积呈多次洼格局，厚度呈北东走向，涠洲期期呈单洼格局，厚度呈近东西展布；另一方面流沙港末期与周边凹陷相比抬升剥蚀严重，最大剥蚀厚度可达600 m以上。迈陈凹陷烃源岩层系（流二段）沉积后经历了流沙港沉积末期和涠洲组沉积末期的区域抬升，造成埋深减少，延缓了烃源岩的成熟，使得迈陈凹陷主要生排烃期推迟至下洋组沉积期至今，为晚期成藏。
통과지진、찬정、측정자료상세분석，매진요함신생대가화분위륙상단함、해상요함연화계단，기중단함계단시신세류사항기지점신세위주기존재착구조격국적전변，즉요함구조격국유북동향전형위근동서향。매진요함구조대지층침적구유명현공제작용，일방면류사항기지층침적정다차와격국，후도정북동주향，위주기기정단와격국，후도정근동서전포；령일방면류사항말기여주변요함상비태승박식엄중，최대박식후도가체600 m이상。매진요함경원암층계（류이단）침적후경력료류사항침적말기화위주조침적말기적구역태승，조성매심감소，연완료경원암적성숙，사득매진요함주요생배경기추지지하양조침적기지금，위만기성장。
By analyzed data of seismic ,drilling and well logging in detail ,it is found that the Cenozoic of Maichen sag can be divided into the continental fault depression phase and the marine depression phase ,of which there is a transforma-tion of tectonic framework from Liushagang period to Weizhou period in the fault depression phase .In other words,the tec-tonic framework transformed from north -east to near east -west.The Maichen sag structure has obvious control effect on strata sedimentary .On the one hand ,the formation depositions and the thickness isoline are multiple sags and NE direction in Liushagang period ,and single sag and EW direction in Weizhou period ,respectively .On the other hand ,the uplift ero-sion in late Liushagang period was serious in comparison with the surrounding sags ,and the biggest erosion thickness can reach above 600 m.The source rocks in Maichen sag ,the second member of Liushagang formation ,experienced the regional uplift in late Liushagang and Weizhou period .As a result ,the buried depth was decreased and the maturity of the hydrocar-bon source rocks was delayed .Therefore,the Maichen sag is the late hydrocarbon accumulation ,of which the main hydro-carbon expulsion period was postponed until the Xiayang period .