收稿日期: 2012-04-16
修回日期: 2012-05-25
网络出版日期: 2012-06-10
基金资助
国家自然科学基金项目(编号:41172104);国家油气重大专项(编号:20112X05009-002);高等学校博士学科点专项科研基金(编号:20090007120001)联合资助.
Sedimentary Characteristics and Model of Gravity Flows inYan 18 Area of the Steep Slope in Dongying Sag of Jiyang Depression
Received date: 2012-04-16
Revised date: 2012-05-25
Online published: 2012-06-10
针对断陷湖盆陡坡带构造活动性强、沉积规模小、储层非均质性的特征，利用济阳坳陷东营凹陷北带盐18地区丰富的地质、3D地震资料，从砂体成因入手，开展了砂体的成因识别、发育规模、沉积相类型及发育规律研究。通过研究，识别出液化流、浊流、颗粒流、泥质碎屑流和砂质碎屑流等5种重力流沉积；其中砂质碎屑流钻遇程度最高，浊流次之，液化流较低，颗粒流更低，每10m钻遇层数分别为2.9、2.6、0.75、0.3层。单期沉积厚度统计结果表明，泥质碎屑流最大、砂质碎屑流次之、浊流较小，其最大厚度分别为4.0m、3.5m、1.4m，平均厚度分别为1.2m、0.45m和0.2m；颗粒流和液化流规模最小。可见，砂质碎屑流是陡坡带重力流沉积中最为有利的砂体成因类型，其次为规模较大的浊流。识别出了扇三角洲、近岸水下扇、滑塌湖底扇、洪水湖底扇等4种重力流相关沉积相；沉积环境自下而上经过了浅水扇三角洲沉积、[JP3]深水近岸水下扇—洪水湖底扇—滑塌湖底扇沉积、深水近岸水下扇—滑塌浊积扇沉积3个阶段；其中洪水湖底扇和近岸水下扇扇中亚相最有利于油气成藏，其次为滑塌湖底扇。
路智勇 . 济阳坳陷东营凹陷陡坡带盐18 地区重力流沉积特征与沉积模式[J]. 天然气地球科学, 2012 , 23(3) : 420 -429 . DOI: 10.11764/j.issn.1672-1926.2012.03.420
Sand genesis,scale,sedimentary facies composition and development rules of sedimentary rocks from Yan 18 area in the steep slope of northern Dongying sag of Jiyang depression were studied by using rich geological and 3D seismic data,according to the characteristics of the steep slope of rift lacustrine basin with extensive tectonic activity,small-scale deposition and the highly heterogeneity of reservoir.Five kinds of gravity flow deposits were identified,i.e.liquefied flow,turbidity current,particle flow,muddy debris flow and sandy debris flow.Sandy debris flow deposit,turbidite,liquefied flow and grain flow declined in drilling degree,with 2.9,2.6,0.75,0.3 drilled layers through every 10m respectively.The statistical results prove that the single sedimentary thickness of muddy debris flow was the largest one,sandy debris flow the second,turbidite the less,and their maximum thickness were of 4.0m,3.5m,1.4m and average thickness of 1.2m,0.45mand 0.2m respectively.Study shows that sandy debris flow deposit was the most favorable sand type of all gravity flow deposits in the steep slope,and then was the thick turbidite.Additionally,four types of gravity flow-related sedimentary facies,i.e.,fan delta,nearshore subaqueous fan,slump sublacustrine fan and flood sublacustrine fan,have been recognized.Three stages of sedimentary environment evolution were discussed from the bottom up,the shallow water fan delta deposits,the deep-water nearshore subaqueous fan-flood sublacustrine fan-slump sublacustrine fan deposits,and the deep water nearshore subaqueous fan-slump turbidite fan deposits.Among them,the mid-fan subfacies of the flood sublacustrine fan and nearshore subaqueous fan were the most favorable subfacies for hydrocarbon accumulation,followed by the slump sublacustrine fan.
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