CAJ | 학술논문

南襄盆地泌阳凹陷南部陡坡带核桃园组发育大量的砂砾岩体。这些砂砾岩体与鼻状构造配置形成该凹陷重要的油气藏。但是，前人对砂砾岩体成因的研究一直存在较大的争议，主要争论集中于砂体成因是扇三角洲成因还是近岸水下扇成因。为了明确砂砾岩体的成因及平面展布，在高精度层序地层格架建立的基础上，主要利用对比的方法，从沉积相发育背景、沉积亚相及微相划分、钻测井特征、岩心特征、粒度分布特征及地震反射特征6个方面，对这两种相类型进行了总结对比，并对控制因素进行了初步的探讨。研究结果表明，边界大断裂的活动造成的断层陡缓程度的差别对工区砂体成因类型起着重要的控制作用。在平面上，断层较缓（55°～75°）的西部地区发育扇三角洲；而在断层较陡（75°～90°）的东部地区，则发育近岸水下扇。在地震剖面上，早期断层比较陡，易沉积近岸水下扇；晚期断层比较缓，易沉积扇三角洲。
남양분지비양요함남부두파대핵도완조발육대량적사력암체。저사사력암체여비상구조배치형성해요함중요적유기장。단시，전인대사력암체성인적연구일직존재교대적쟁의，주요쟁론집중우사체성인시선삼각주성인환시근안수하선성인。위료명학사력암체적성인급평면전포，재고정도층서지층격가건립적기출상，주요이용대비적방법，종침적상발육배경、침적아상급미상화분、찬측정특정、암심특정、립도분포특정급지진반사특정6개방면，대저량충상류형진행료총결대비，병대공제인소진행료초보적탐토。연구결과표명，변계대단렬적활동조성적단층두완정도적차별대공구사체성인류형기착중요적공제작용。재평면상，단층교완（55°～75°）적서부지구발육선삼각주；이재단층교두（75°～90°）적동부지구，칙발육근안수하선。재지진부면상，조기단층비교두，역침적근안수하선；만기단층비교완，역침적선삼각주。
Coarse-grained clastic deposits are widely developed in the Hetaoyuan Formation of the steep slope belt in southern Biyang Sag of Nanxiang Basin .They together with nose-like structures in the sag form many high-quality oil and gas reservoirs .However ,the genesis of these deposits is still uncertain .The bone of contention is whether they are fan del-ta genesis or nearshore subaqueous fan genesis .To answer the question and get a better look at how they are distributed horizontally ,we compared and summarized the two geneses and discussed their controlling factors in a stratigraphic se -quence framework and from the following 6 perspectives of sedimentary settings ,subfacies and microfacies categorization , drilling and logging data,core analyses,grain size distribution features and seismic response characteristics .The results show that the steepness difference of faults caused by large boundary faulting activities controlled their genesis .Horizon-tally,fan deltas are developed in the west area with gentle faults (55°-75°) while nearshore subaqueous fans are deve-loped in the east area with steep faults(75°-90°)nearshore.Seismic profiles also show that early faults are steeper and favorable for the deposition of nearshore subaqueous fans;while later faults are more gentle and good for fan delta to be formed.