CAJ | 학술논문

志靖安塞地区位于鄂尔多斯盆地陕北斜坡中部.以钻井取心观察为基础,结合砂岩厚度、砂地比、自生绿泥石分布、古生物化石分布等因素,对长9油层组2个层段沉积相空间展布特征及沉积演化规律进行研究.结果表明,长9油层组发育一套三角洲-湖泊沉积,北部主要发育三角洲前缘沉积,在南部发育浅湖沉积.长92沉积期,湖盆范围较小,长91沉积期湖盆初始扩张,湖岸线向北推进,湖域面积增大.从长92沉积期到长91沉积期,研究区经历了沉积水体由浅变深的过程,并在长91顶部发育一套具有生烃潜力的高阻泥岩.三角洲前缘水下分流河道砂体是较有利的储集砂体.
지정안새지구위우악이다사분지협북사파중부.이찬정취심관찰위기출,결합사암후도、사지비、자생록니석분포、고생물화석분포등인소,대장9유층조2개층단침적상공간전포특정급침적연화규률진행연구.결과표명,장9유층조발육일투삼각주-호박침적,북부주요발육삼각주전연침적,재남부발육천호침적.장92침적기,호분범위교소,장91침적기호분초시확장,호안선향북추진,호역면적증대.종장92침적기도장91침적기,연구구경력료침적수체유천변심적과정,병재장91정부발육일투구유생경잠력적고조니암.삼각주전연수하분류하도사체시교유리적저집사체.
Zhijing-Ansai area is located in the middle of Shanbei slope of the Ordos Basin. Based on detailed observations of well core, sandstone thickness, sandstone strata thickness ratio, authigenic chlorite development characteristics, and paleontological charac-teristics, the authors studied the distribution regularity of sedimentary facies and the sedimentary evolution. The results show that a suite of meandering fluvial deltas-lacustrine sediments were developed in the study area. The delta front deposits were mainly devel-oped in the northern part of the study area, whereas shallow lake sediments were developed in the southern part of the study area. The size of the lake basin in Chang 92 oil formation was smaller than that in Chang 91 oil formation. During the depositional period of Chang 91 oil formation, the lacustrine basin began to expand, and lake shoreline moved to the land, with the expansion of the lake area. Form Chang 92 oil formation to Chang 91 oil formation, the water depth changed from shallow to deep, and then a set of high resistance mudstones with hydrocarbon-generating potential were deposited, and the deltaic front subaqueous distributary channel sand bodies became high quality reservoirs.