松辽盆地萨尔图地区嫩一段湖底扇的发现及意义
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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。
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.
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.
引文
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[19]袁选俊,薛良清.坳陷湖盆层序地层特征与隐蔽油气藏勘探——以松辽盆地为例[J].石油学报,2003,24(3):11～15.
[20]翟光明.中国石油地质志(卷2)[M].北京:石油工业出版社,1993.278～293.
[2]Shanmugam G.50years of the turbidite paradigm(from 1950s to 1990's):Deep-water processes and facies models——a critical per-spective[J].Marine and Petroleum Geology,2000,17(2):285～342.
[3]Piper D J W,Normar W R.Sandy fans——From Amazon to Hueneme and beyond[J].AAPG Bulletin,2001,85(8):1407～1438.
[4]Mutti E,Tinterri R.deltaic,mixed and turbidite sedimentation of ancient foreland basins[J].Marine and Petroleum Geology,2003,20(6-8):733～755.
[5]彭勇民,黄捍东.济阳坳陷车镇凹陷66块沙三下段精细沉积相分析[J].现代地质,2007,21(4):705～711.
[6]饶孟余,钟建华.山东东营牛庄洼陷沙三中亚段浊积砂体储层特征及影响因素[J].现代地质,2004,18(2):256～262.
[7]郑荣才,文华国.鄂尔多斯盆地白豹地区长6油层组湖底滑塌浊积扇及其研究意义[J].成都理工大学学报(自然科学版),2006,33(6):566～575.
[8]陈广坡,王天奇.箕状断陷湖盆湖底扇特征及油气勘探——以二连盆地赛汉塔拉凹陷腾格尔组二段为例[J].石油勘探与开发,2010,37(1):63～69.
[9]Feng Z Q,Zhang S,Cross T A,et al.Lacustrine turbidite channels and fans in the Mesozoic Songliao Basin,China[J].Basin Re-search,2009,22(1):96～107.
[10]Metz J M,Grotzinger J P.Sublacustrine depositional fans in southwest Melas Chasma[J].Journal of Geophysical Research,2009,114(10):148～167.
[11]Xin R C,Li G F,Feng Z Q,et al.Depositional characteristics of lake-floor fan of Cretaceous lower Yaojiang Formation in westernpart of central depression region,Songliao Basin[J].Journal of Earth Science,2009,20(4):731～745.
[12]金明玉,张顺.松辽盆地萨尔图地区嫩江组二段滑塌扇的发现及其石油地质意义[J].石油天热气学报,2010,32(5):187～190.
[13]辛仁臣,蔡希源,王英民.松辽坳陷深水湖盆层序界面特征及低位域沉积模式[J].沉积学报,2004,22(3):387～392.
[14]林春明,冯志强,张顺,等.松辽盆地北部白垩纪超层序特征[J].古地理学报,2007,9(6):619～634.
[15]邹才能.松辽盆地南部白垩系泉头组～嫩江组沉积层序特征与地层——岩性油气藏形成条件[J].石油勘探与开发,2004,31(2):14～17.
[16]冯志强,张顺.松辽盆地嫩江组大型陆相坳陷湖盆湖底水道的发现及其石油地质意义[J].地质学报,2006,80(8):1226～1233.
[17]叶得泉,黄清华.松辽盆地白垩纪介形类生物地层学[M].北京:石油工业出版社,2002.103～104.
[18]Shanmugam G.The bouma sequence and the turbidite mind set[J].Earth-Science Reviews,1997,42:201～229.
[19]袁选俊,薛良清.坳陷湖盆层序地层特征与隐蔽油气藏勘探——以松辽盆地为例[J].石油学报,2003,24(3):11～15.
[20]翟光明.中国石油地质志(卷2)[M].北京:石油工业出版社,1993.278～293.
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