CAJ | 학술논문

塔南凹陷是海拉尔-塔木察格盆地最重要的油气勘探地区之一。利用岩心、测井和三维地震等资料，对塔南凹陷南屯组一段层序地层格架和沉积体系特征进行了深入研究。结果表明，南屯组一段顶、底及内部可以识别出3个不整合面和2个湖泛面，最终将其划分为3个三级层序。进而在等时地层格架的基础上，对沉积相类型和沉积体系展布特征进行了分析，确定南屯组一段主要发育扇三角洲、湖底扇和湖泊3种沉积体系。南屯组一段中、下部沉积时期，受盆地被动裂谷期“泛盆”沉积特征震荡式沉降影响，研究区主要发育西部缓坡物源控制下的扇三角洲沉积体系；南屯组一段上部沉积时期，受盆地主动裂谷期快速沉降影响，研究区主要发育湖泊沉积体系，此时盆内部次级控陷断层受北西-南东向拉张发生翘倾形成大规模反向正断层。源-储互层组合高效排烃特征、扇三角洲前缘高孔-高渗分流河道砂体和断层翘倾形成上升盘构造高部位共同决定西部次凹中洼槽反向断层下盘为油气富集主要部位。
탑남요함시해랍이-탑목찰격분지최중요적유기감탐지구지일。이용암심、측정화삼유지진등자료，대탑남요함남둔조일단층서지층격가화침적체계특정진행료심입연구。결과표명，남둔조일단정、저급내부가이식별출3개불정합면화2개호범면，최종장기화분위3개삼급층서。진이재등시지층격가적기출상，대침적상류형화침적체계전포특정진행료분석，학정남둔조일단주요발육선삼각주、호저선화호박3충침적체계。남둔조일단중、하부침적시기，수분지피동렬곡기“범분”침적특정진탕식침강영향，연구구주요발육서부완파물원공제하적선삼각주침적체계；남둔조일단상부침적시기，수분지주동렬곡기쾌속침강영향，연구구주요발육호박침적체계，차시분내부차급공함단층수북서-남동향랍장발생교경형성대규모반향정단층。원-저호층조합고효배경특정、선삼각주전연고공-고삼분류하도사체화단층교경형성상승반구조고부위공동결정서부차요중와조반향단층하반위유기부집주요부위。
Tanan Depression is one of the most important oil and gas exploration areas in Hailaer-Talmud Zagat Basin . Various data including cores ,logs and 3 D seismic data were integrated to study in detail the sequence stratigraphic frame-work and sedimentary system characteristics of K1n1(the 1st member of Nantun Fm)in Tanan Sag,Haita Basin.Three un-conformites and two lake flooding surfaces were identified in K 1 n1 ,according to which K 1 n1 was divided into three third-order sequences .The types of sedimentary facies and distribution characteristics of sedimentary system were analyzed on the basis of isochronous stratigraphic framework .Three sedimentary systems namely fan delta ,sublacustrine fan and lake were identified in the K 1 n1 .Fan delta sedimentary system under the control of provenance on the western gentle slope dominated in the study area during the deposition of the middle-lower part of K 1 n1 due to the influences of oscillatory sub-sidence of“flood basin”during passive rifting .In contrast ,lake deposition system was predominant in the study area dur-ing the deposition of the upper part of K 1 n1 due to the rapid subsidence in the process of active rifting .At the same time, the secondary depression-controlling faults experienced NW-SE extension and tilted , forming large-scale reverse normal faults.Efficient hydrocarbon expulsion characteristics of interbeded source rock and reservoir combination ,high porosity and permeability of distributary channel sands of fan delta front facies and structural high in the upthrown block of fault jointly determined the footwall of antithetic fault in the western subsag to be the main location of oil accumulation .