【作者】 王树恒；

【导师】 卢双舫； 辛仁臣；

【作者基本信息】 大庆石油大学 ， 油气田开发工程， 2006， 博士

【摘要】 借鉴前人研究成果，综合利用岩心、录井、测井、地震、分析化验资料及古生物资料，应用层序地层学、高分辨率地层学、沉积学、地球物理学、古生物地层学、地球化学等多学科的新理论、新技术和新方法，发挥多学科联合攻关的优势，对松辽盆地北部西部斜坡中部含油组合进行了系统而精确的层序地层及沉积体系研究。本项研究成果丰富了陆相层序地层学和湖盆沉积学，并对该区下一步油气勘探与开发具有重要的指导作用和借鉴价值。 研究区从青二三段底界到嫩江组一段顶界发育5个三级层序和10个四级层序，三级层序分别为青二段(SQqn2)、青三段(SQqn3)、姚一段～姚二段(SQy1-2)、姚三段(SQy3)、嫩一段—嫩三段(SQn1-3)。三级层序均由水进域(TST)和高位域(HST)构成。SQqn2划分为2个四级层序(C1、C2)、SQqn3划分为3个四级层序(C3、C4、C5)、SQy1-2、SQy3分别只发育1个四级层序(C6、C7)、嫩一段划分为3个四级层序(C8、C9、C10)。四级层序C1、C2、C3、C4、C5、C6发育水进域(T)和高位域(R)，C7主要发育水进域(T)，研究东侧发育有高位域(R)，C8以厚层暗色泥岩为主，在富拉尔基地区及其以西发育水进域砂岩，C9在研究区主体发育低位域(S)砂岩、高位域浊积砂和厚层暗色泥岩，在富拉尔基地区及其以西发育水进域和高位域砂岩，C10在研究区主体发育低位域(S)砂岩，在富拉尔基地区及其以西发育水进域砂岩。三级层序界面有10种表现特征，四级层序界面有12种表现特征。青山口组顶部的四级层序C5和姚家组下部的四级层序C6分布范围最为局限，主要分布研究区的东南部。青山口组中上部的四级层序C4和姚家组上部的四级层序C7分布范围明显扩大，青山口组中下部的四级层序C1、C2、C3分布范围几乎覆盖整个西部斜坡，嫩江组一段的四级层序C8、C9、C10分布范围超出西部斜坡区。 三级层序SQqn2及其包含的四级层序各体系域以三角洲和湖泊相共存为特征，自下而上三角洲规模逐渐扩大，三级层序SQqn3的水进域(四级层序C3的高位域和水进域)三角洲相对不发育，湖泊分布范围较广，并形成大量湖湾碳酸盐岩沉积层。三级层序SQqn3的高位域(四级层序C4、C5的高位域和水进域)沉积区逐渐向东退缩，三角洲逐渐向东推进，湖泊相占优势区域逐渐缩小。三级层序SQy1-2(四级层序C6)的高位域和水进域)为三角洲和滨浅湖沉积，其中水进域分布范围较小，以三角洲占主体。三级层序SQy3相当于四级层序C7，主要发育水进域。为三角洲和滨浅湖砂坝、滨浅湖砂泥混合滩及下切水道充填共存的沉积格局。嫩一段发育的3个四级层序，5个富砂体系域发育时期，三角洲只发育于西北缘，西侧发育小规模的滨岸砂坝，西部斜坡主体的砂岩为低位域和高位域的碎屑流、浊流成因的湖底扇，其典型特征是厚层暗色泥岩夹纯砂岩，上下突变。 西部斜坡中部组合的沉积作用受古地形、湖平面变化、岸线位置和北部物源、齐齐哈尔物源、西部短物源及西南物源影响，形成以三角洲和滨浅湖砂坝、滨浅湖泥、钙质混合滩共存的沉积格局。青二三段沉积早中期，湖岸线在西部斜坡主体波动，在物源供应较强时期，三角洲较为发育，在物源供应较弱时期湖湾相对发育；青二三段沉积晚期，湖岸线在西部斜坡东侧波动，姚家组沉积早期，湖岸线在西部斜坡东部边缘波动，物源供应相对较强，沉积相以三角洲相对优势。姚家组沉积晚期，湖岸线向西大规模推进，形成独具特色的三角洲—下切水道充填—砂质滩坝沉积相分布格局。嫩一段沉积时期湖岸线在盆地边缘波动，受盆地边缘陡坡(坡折)的控制，形成广泛分布的低位域和高位域湖底扇。 研究区段发育的地层—岩性圈闭类型主要为砂质滩坝成因的砂岩透镜体岩性圈闭和砂岩上倾尖灭地层圈闭。砂岩透镜体岩性圈闭主要发育于研究区的中部和东部，砂岩上倾尖灭地层圈闭主要发育于研究区东部。更多还原

【Abstract】 This study not only applies comprehensively cores, logging, well logging, seismics, analysis assay data and paleontology data, but also adopts the latest theories and technique and methods of sequence stratigraphy, high-resolution stratigraphy, sedimentography, oil-gas geology, geophysics, stratigraphic paleontology and geochemistry, etc. Exerting the predominance of many subjects jointly tackling key problem, The paper profoundly analyses and studies the sequence stratigraphy and sedimentary systems of the middle oil-bearing assemblage in West clinoform region of north Songliao Basin.This research achievements enriches continental facies sequence stratigraphy and lake basin sedimentology. Furthermore, the achievements have important instruction function and reference value for henceforth oil and gas exploration in this region.From the bottom boundary of No.2～3member of Qingshankou Formation to the top boundary of No.1member of Nenjiang Formation Five three-stage sequences and ten four-stage sequences are developed in Work area. Three-stage sequences separately are No.2member of Qingshankou Formation (SQqn2) , No.3member of Qingshankou Formation (SQqn3) , No.1～2member of Yaojia Formation (SQy1-2), No.3member of Yaojia Formation (SQy3), No.1～3member of Nenjiang Formation (SQn1-3). All of the three-stage sequences develop transgressive system tract and high-position system tract. SQqn2 is composed of four-stage sequence c1 and c2. SQqn3 is composed of four-stage sequence c3, c4 and c5. SQy1-2 develops four-stage sequence c6. SQy3 develops four-stage sequence c7. SQn1-3 develops four-stage sequence c8, c9 and c10. Four-stage sequences cl to c6 separately develop transgressive system tract and high-position system tract. C7 mostly develops transgressive system tract and develops high-position system tract in the west edge of work area. C8 mostly develops thick saturated mudstone and develops transgressive system tract sandstone in Fulaerji and its west area. C9 develops low-position system tract sandstone, high-position system tract turbidite and thick saturated mudstone in mostly area, and it develops transgressive system tract and high-position system tract sandstone in Fulaerji and its west area. C10 develops low-position system tract sandstone in mostly area, and it develops transgressive system tract sandstone in Fulaerji and its west area. Three-stage sequence interfaces have ten characters and four-stage sequence interfaces have twelve characters. C5 locates on the top of Qingshankou Formation. C6 locates on the bottom of Yaojia Formation. The distributions of c5 and c6 are the least and mostly distributes in the southeast area. C4 locates on the middle-upside of Qingshankou Formation. C7 locates on the upside of Yaojia Formation. The distributions of c4 and c7 are obvious ampliative. C1, c2 and c3 locate on the middle-underside of Qingshankou Formation. The distributions of c1, c2 and c3 nearly cover West clinoform region. C8,c9 and c10 form Nenjiang Formation.The distributions of c8,c9 and c10 exceed beyond West clinoform region.Each system tract of SQqn2 and those system tracts of four-stage sequences it containing develop lacustrine facies and delta facies. The scale of deltas gradually enlarge upwords. The transgressive system tract of three-stage sequence SQqn3 corresponds to the transgressive system tract and high-position system tract of four-stage sequence c3, and it relatively develops bad deltas and broad lacustrine facies sediments and forms abundant lake bay carbonate sediment terranes. The high-position system tract of SQqn3 corresponds to the transgressive system tract and high-position system tract of four-stage sequence c4 and c5. Its distribution gradually shrinks eastwordly, and delta gradually push eastwordly, and the zone of更多还原