【摘要】 通过岩性、粒度、沉积构造和电性等多方面综合分析,发现松辽盆地萨尔图地区嫩江组一段(K2n1)中发育具有浊流和滑塌特征的湖底扇沉积。地震属性和井综合分析进一步揭示出了湖底扇的展布特征:研究区内主要发育由北向南延伸和由西北向东南延伸的湖底扇,最大面积分别为15km2和6.5km2,其中只有由北向南延伸的湖底扇发育湖底水道,水道最大宽度约550m,长约5.9km。研究发现湖底扇的延伸方向和扇体的大小与沉积物的供给方向和供给量的大小密切相关,这可能反映了沉积物供给对于湖底扇发育的控制作用。湖底扇形成于深水背景,与泥页岩毗邻,易形成岩性圈闭,叠加在萨尔图背斜构造之上,还可以形成复合型圈闭,而且岩心观察、荧光测试和电测解释等都表明湖底扇砂体具有较好的含油气性,因此,区内湖底扇具有非常重要的油气勘探意义。更多还原

【Abstract】 Based on comprehensive analysis of lithology,grain size,sedimentary structure,electric property and so on,sub-lacustrine fans with the characteristics of turbidite and(or) slump were identified within the first member of Nenjiang Formation in Sa’ertu Area of Songliao Basin.An integrated research of well and seismic attributes further revealed that the sublacustrine fans extended mainly from the north to south and from the northwest to southeast with a largest area of 15 km2,6.5km2 respectively.Of all the sub-lacustrine fans,only those extending from the north to south had sublacustrine channels with the largest width of around 550 m and a maximum length of around 5.9 km.Moreover,the study shows that the size and distribution of the sublacustrine fans are associated with the volume and direction of sediment supply,which reflects that the sediment supply controls of the development of the sublacustrine fans.The Sublacustrine fans develop from deep water environment and tend to form lithologic traps,they are adjacent to mud shale and can also form lithologic structural traps when they are superimposed on the Sa’ertu Anticline Structure.Besides,electrical logging interpretation,fluorescence testing and core observation also indicate that these sublacustrine fan sand-bodies are of good oil-gas potential.Thus,these sublacustrine fans discovered in the first member of Nenjiang Formation are of great significance for hydrocarbon exploration.更多还原