| 东营凹陷滑塌型重力流沉积分布特征及三角洲沉积对其影响 |
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| 引用本文： | 张青青,操应长,刘可禹,杨田,王艳忠,贾光华,刘鑫金.东营凹陷滑塌型重力流沉积分布特征及三角洲沉积对其影响[J].地球科学,2017,42(11):2025-2039. |
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| 作者姓名： | 张青青 操应长 刘可禹 杨田 王艳忠 贾光华 刘鑫金 |
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| 作者单位： | 1.中国石油大学地球科学与技术学院, 山东青岛 266580 |
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| 基金项目： | 中央高校基本科研业务费专项资金项目14CX06070A国家重大科技专项2011ZX05009-003 |
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| 摘 要： | 三角洲沉积为滑塌型重力流的形成提供了物质来源，它对前端滑塌型重力流的沉积分布特征具有重要影响.以东营凹陷洼陷带沙三中亚段三角洲-前端滑塌型重力流沉积为研究对象，综合利用钻井岩心、三维地震、测录井及分析测试等资料，总结不同类型滑塌型重力流沉积特征、识别标志和分布特征，分析三角洲作为物源对滑塌型重力流的形成、沉积类型、沉积特征和分布特征的影响.研究表明，研究区滑塌型重力流沉积主要发育滑动岩、滑塌岩、碎屑流沉积和浊积岩4种类型，不同类型其沉积构造、粒度特征、地球物理特征差异显著.研究区砂质碎屑流沉积最为发育，滑动滑塌沉积次之，浊流沉积和泥质碎屑流沉积少量发育.不同地区重力流沉积发育程度及常见垂向序列存在差异，博兴南坡与辛133区块重力流类型以砂质碎屑流沉积为主，常见多期次砂质碎屑流沉积相邻或相间垂向组合；牛庄南坡与中央隆起带地区类似，由近及远，重力流类型及垂向序列存在较大差异；营11区块以砂质碎屑流沉积和浊流沉积为主，浊流比例相对其他区块较高；丰14区块单井重力流类型整体较单一，为砂质碎屑流沉积或滑塌沉积.三角洲砂泥百分含量控制了滑塌型重力流的沉积类型和沉积特征；三角洲沉积物粒径控制原始前积角大小，前积角越大，滑塌型重力流越发育，但滑移距离相对越近；三角洲的坡折点控制下，滑动滑塌沉积主要分布在斜坡坡脚和同沉积断层附近，浊流沉积主要分布在深水平原，碎屑流沉积在斜坡坡脚-深水平原均有分布；三角洲高的堆积速率通过减小内摩擦力促使滑塌型重力流的形成，其堆积速率与构造沉降速率的差异对滑塌型重力流沉积的垂向叠置和侧向连续性也具有重要影响.
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| 关 键 词： | 滑塌型重力流沉积 沉积特征 分布特征 三角洲物源 沙三中亚段 东营凹陷 石油地质 |
| 收稿时间： | 2017-05-18 |
Sedimentary Characteristics of Re-Transported Gravity Flow Deposits and Their Distribution:Influence of Deltaic Sedimentation in the Dongying Sag |
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| Abstract: | Deltaic sedimentation provides the material source for the formation of re-transported gravity flow, and it has a significant effect on the sedimentary characteristics and distribution of re-transported gravity flow deposits. The sedimentary characteristics of different types of gravity flow deposits and their distribution in the middle part of the third member of Shahejie Formation of the Dongying sag were investigated using core, granularity, seismic and well logging data. The influence of deltaic sedimentation on the re-transported gravity flow deposits was studied. It has been shown that four types of gravity flow deposits were developed in Es3z in the Dongying sag, including slide and slump deposits, debrites, and turbidites. There exist differences among different types of gravity flow deposits in terms of sedimentary structures, grain size characteristics, and geophysical responses. In the study area, sandy debrites were best developed, followed sequentially by slide and slump deposits, turbidites, and muddy debrites. There are differences in the abundance of the types and the vertical sequences of diffenent deposits among different locations in the study area. The sedimentary types are mainly composed of sandy debrites with vertical sequences characteristic of amalgamation of sandy debrites being common in the southern Boxing and Xin-133 blocks.There is a big difference among gravity flow deposits and vertical sequences from proximal to distal in the southern of Niuzhuang area and the western central uplift zone.Turbidites are better developed in the Ying-11 block. Sandy debrites and slump deposits are the dominated deposits in the Feng-14 block. The mud content of the delta front deposits appears to have a significant impact on the gravity flow types and their sedimentary characteristics. Deltaic sediments with different grain sizes have different slope angles which is closely related to the formation, types and distribution characteristics of the gravity flow deposits. Under the same conditions, the larger the progradation slope angle is, the better developed the re-transported gravity flow deposits would be, especially for the slide and slump deposits. On the contrary, the sliding distance is shorter. The slide and slump deposits are mainly distributed in the slope break and near the syn-sedimentary faults; turbidites are mainly in the basin floor; while debris flow deposits occur from the slope break to the basin floor.The high accumulation rate contributes to the formation of gravity flows by decreasing the internal friction, and the difference between the accumulation rate and subsidence rate is also of great importance to the vertical superimposed structures and lateral continuity of re-transported gravity flow deposits. |
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