Gravity Flow Deposits and Its Genetic Mechanism of Dainan Formation in Huangjue-Majiazui District, Gaoyou Subbasin
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摘要: 苏北盆地勘探开发重点正逐步由寻找构造类油气藏向寻找隐蔽油气藏转变，重力流沉积形成的岩性砂体对隐蔽油气藏的勘探显得日益重要.以岩心、测-录井、地震反射特征等资料对苏北盆地高邮凹陷西南端黄珏-马家嘴地区戴南组沉积砂体及其成因进行研究，结果表明：该区戴南组一段沉积时期主要发育了近岸水下冲积扇、滑塌-浊积扇沉积；戴南组二段沉积时期主要发育了扇三角洲沉积、滑塌-浊积扇沉积.这些沉积砂体的发育与独特的构造样式、活跃的构造背景、外力活动等因素有着密切的联系；滑塌-浊积扇的发现为进一步的油气勘探提供了依据和思路.Abstract: The main exploration targets of petroleum prospecting in Subei Basin shift gradually from structural reservoirs to subtle reservoirs nowadays. As potential gas and oil-bearing reservoirs, gravity flow sediment prospecting becomes more important for subtle reservoirs exploration. Based on the core observation, well logging, seismic profile characters, gravity flow deposits developed in E2d of Huangjue-Majiazui district in Gaoyou sag and their genies are studied. It is found that nearshore subaqueous alluvial fans and slump-turbidities developed in E2d1 in study area, while fan deltas and slump-turbidities developed in E2d2. The development of sandbodies is considered to be closely coordinated with the special structural pattern, special and active tectonic backgrounds. Discovery of slump-turbidities provides theoretical framework for oil and gas exploration.
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图 1 黄珏马家嘴地区E2d构造、井位
1.井名井位；2.地名；3.断层；4.工区范围；5.剖面位置
Fig. 1. Structural and well location map in Huang-Ma district of E2d
图 2 黄珏地区E2d1近岸水下冲积扇地震反射特征
Fig. 2. Near-shore subaqueous alluvial fans' seismic reflection character of E2d1 in HJ area
图 3 黄珏地区E2d1近岸水下冲积扇岩心沉积现象
a.黄3-3井，2 243.00 m，灰色砾岩，砾径可达10 cm以上，近岸水下冲积扇扇根；b.黄3-3井，2 239.00 m灰色含砾粗砂岩，颗粒支撑-杂基支撑近岸水下冲积扇扇中主水道；c.新黄31井，2 715.00 m灰色粗砂岩，偶见定向排列泥砾，近岸水下冲积扇扇中辫状水道；d.黄31井，2 369.00 m灰白色泥质粉砂岩-砂质泥岩，近岸水下冲积扇扇中辫状水道；e.黄32井，2 365.00 m灰白色粉砂岩与灰色泥岩互层，近岸水下冲积扇扇中水道间；f.黄31井，2 239.00 m灰褐色泥岩，含植物叶片化石，近岸水下冲积扇扇端
Fig. 3. Core sedimentary phenomenon of E2d1 in HJ area
图 4 黄32井E2d1近岸水下冲积扇沉积局部
Fig. 4. Part of near-shore subaqueous alluvial Fans profile in well H32, E2d1
图 5 黄珏-马家嘴地区E2d2岩心沉积现象(从左至右表表示为从顶至底关系)
a.黄27-3井，1 555.00 m，棕红色泥岩差胶结，扇三角洲平原泥石流；b.黄35-2井，1 588.00 m，棕红色泥质粉砂岩见斜虫孔，扇三角洲平原辫状水道；c.黄4井，1 511.82 m，棕红色粉砂质泥岩, 扇三角平原分流间湾；d.黄4井，1 878.00 m，杂色含砾不等粒砂岩，扇三角洲前缘水下主水道底部；e.马6井，1 572.00 m，灰白色砾质粗砂岩，扇三角洲前缘水道；f.黄4井，1 876.00 m，杂色砾岩向上变为灰色粗砂岩，扇三角洲前缘水下河道；g.马6井，1 569.01 m，棕色-黄绿色泥岩互层见波状层理，扇三角洲前缘水下天然堤；h.马7井，1 477.00 m，灰绿色粉砂质泥岩与褐色泥岩互层见人字形交错层理，扇三角洲前缘席状砂；i.马7井，1 475.00 m，褐色油浸粗砂岩见楔状交错层理, 扇三角洲前缘水下分流河道
Fig. 5. Core sedimentary phenomenon of E2d2 in HJ-MJZ area
图 9 黄珏-马家嘴地区E2d1、E2d2滑塌-浊积岩岩心沉积现象(从左至右表表示为从顶至底关系
a.黄32井，2 372.78 m，E2d1，灰色粉砂岩-泥质粉砂岩，鲍马序列；b.马13-2井，1 439.53 m，E2d2，灰色泥质粉砂岩-粉砂质泥岩，泥质碎屑流；c.黄17-1井，1 511.82 m，E2d2，灰绿色砂质砾岩，砂质碎屑流；d.黄10井，1 535.34 m，E2d2，灰黄色砂质砾岩，砂质碎屑流(以上4照片由董桂玉2010年拍摄)
Fig. 9. Slump-turbidities cores of E2d in HJ-MJZ area
图 10 黄珏-马家嘴地区黄32井、马2井E2d1滑塌-浊积扇沉积
Fig. 10. Slump-turbidities profile of well H32 and well M2 in E2d1 in HJ-MJZ area
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