湖相深水细粒沉积岩米兰科维奇旋回及其页岩油勘探意义——以东营凹陷牛页1井沙四上亚段为例

发布时间：2018-06-13 01:45

本文选题：米兰科维奇旋回 + 细粒沉积岩　；参考：《中国矿业大学学报》2017年04期

【摘要】：以东营凹陷沙四上亚段湖相深水细粒沉积岩为研究对象,综合运用岩心、薄片、测录井、全岩X射线衍射、地球化学元素等资料及频谱分析和小波分析等方法,分析了细粒沉积岩的基本特征,划分了岩相类型,明确了岩相高频旋回成因机制,建立了岩相沉积模式,探讨了米兰科维奇旋回对页岩油勘探的意义.认为东营凹陷沙四上亚段细粒沉积岩发育多种岩相类型,并且记录了稳定的米兰科维奇旋回,岩相旋回性变化主要受控于偏心率和岁差参数,纹层状岩相层偶形成与四季气候变化有关,长偏心率旋回周期分为干冷气候半周期和暖湿气候半周期,暖湿气候半旋回背景下的岁差旋回中期附近地层单元是页岩油勘探的优选层段.研究结果表明:东营凹陷沙四上亚段细粒沉积主要发育8种岩相类型;长偏心率、斜率和岁差周期造成的地层旋回厚度分别为39.4m,3.0~5.2m以及1.7~2.4m,牛页1井沙四上亚段共记录了4个长偏心率旋回和84个21.9ka岁差旋回,堆积速率介于84.47~146.20μm/a;暖湿气候半周期背景下的岁差旋回中期主要发育富有机质纹层状泥质灰岩相,是页岩油勘探的最有利层段,通过米兰科维奇旋回可实现页岩油勘探有利层段的预测.
[Abstract]:The deep water fine-grained sedimentary rocks of the lacustrine facies of the upper member of the upper part of Sha 4 in Dongying depression are studied. The data of core, thin slice, logging, whole rock X-ray diffraction, geochemical elements and other methods, such as spectrum analysis and wavelet analysis, are used synthetically. The basic characteristics of fine-grained sedimentary rocks are analyzed, the lithofacies types are divided, the genetic mechanism of high-frequency cycles of lithofacies is clarified, the sedimentary model of lithofacies is established, and the significance of Milankovich cycle to shale oil exploration is discussed. It is considered that there are many lithofacies types in fine grained sedimentary rocks of upper submember Sha 4 in Dongying sag, and the stable Milankovich cycle is recorded. The variation of lithofacies cyclicity is mainly controlled by eccentricity and precession parameters. The formation of lamellar facies is related to the climate change of the four seasons. The long eccentricity cycle is divided into dry and cold climate half cycle and warm and wet climate half cycle. The stratigraphic unit near the middle period of the precession cycle in the background of warm and wet climate is the optimal reservoir section for shale oil exploration. The results show that there are mainly 8 lithofacies types, long eccentricity, and 8 lithofacies types in fine grained sediments of the upper member of Sha 4 in Dongying Sag. The thickness of formation cycle caused by slope and precession period is 39.4 mb 3.0m and 1.7m 2.4mrespectively. Four long eccentricity cycles and 84 21.9ka precession cycles have been recorded in the upper member of Sha4 in Niuyou 1 well. The accumulation rate is between 84.47 渭 m / a and 146.20 渭 m / a. The stratified mudstone facies with rich organic matter are mainly developed in the middle of the precession cycle under the background of warm and wet climate, which is the most favorable zone for shale oil exploration. The prediction of favorable zone for shale oil exploration can be realized through Milankovich cycle.
【作者单位】：中国石油大学(华东)地球科学与技术学院;中国石化股份胜利油田分公司勘探开发研究院;
【基金】：国家重点基础研究发展规划(973)(2014CB239102) 国家科技重大专项(2017ZX05049-004)
【分类号】：P618.13

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