论文部分内容阅读
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、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。
In view of the characteristics of tectonic activity, small sedimentary scale and reservoir heterogeneity in the steep slope of the fault depression lake basin, this paper makes use of the rich geological and 3D seismic data in Yan 18 area in the north belt of the Dongying Sag, Jiyang Depression. , Carried out the identification of sand bodies, developmental scale, sedimentary facies and development of law. Through the research, five kinds of gravitational flow depositions including liquefied flow, turbid flow, particle flow, muddy debris flow and sandy debris flow were identified. Among them, sandy debris flow reached the highest level, turbidity flow followed by liquefied flow Lower, lower particle flow, drill every 10m layers were 2.9,2.6,0.75,0.3 layers. The statistical results of single-phase sedimentary thickness show that the shale debris flow is the largest, followed by the sandy debris flow, and the turbidity flow is small. The maximum thicknesses are 4.0m, 3.5m and 1.4m, respectively, and the average thicknesses are 1.2m and 0.45 m and 0.2 m; the smallest particle flow and liquefaction flow. It can be seen that the sandy debris flow is the most favorable type of sand body in the steep slope gravity flow deposition, followed by the larger turbidity flow. Four kinds of gravity flow-related sedimentary facies such as fan delta, nearshore submarine fan, slip-bottom sub-fan and flood fan were identified. Sedimentary environment was deposited from bottom to top by shallow fan delta, deep-water nearshore subaqueous fan-flood Sublacustrine fan-slump sublacustrous fan deposition, deep-water nearshore subaqueous fan-slump turbidite fan deposition. Among them, the subfacies of flood lacustrine fan and nearshore fan are most favorable to hydrocarbon accumulation, followed by slippery Falling lake fan.