鄂尔多斯盆地南部三叠系延长组深水重力流沉积特征及其石油地质意义

发布时间：2018-03-16 20:24

本文选题：深水重力流　切入点：沉积特征　出处：《古地理学报》2017年02期 　论文类型：期刊论文

【摘要】：通过大量岩心观察、钻测井资料分析及野外露头观察,对鄂尔多斯盆地南部延长组长6—长7深水重力流沉积特征、触发机制、沉积过程、沉积模式及石油地质意义进行了系统分析。研究结果表明:研究区共存在滑动岩体、滑塌沉积、砂质碎屑流沉积、浊流沉积及泥质碎屑流沉积5种类型的重力流沉积物,各类型的沉积物特征明显。不同类型重力流沉积物垂向组合可分为5类,研究区重力流的形成过程可分为5个阶段:三角洲前缘沉积阶段、滑动阶段、滑塌变形阶段、砂质碎屑流及泥质碎屑流形成阶段以及浊流形成阶段。滑动、滑塌砂体多呈孤立透镜体状,砂质碎屑流砂体多以扇沟道的形式展现出来,浊流砂体多分布在扇沟道的前端或侧翼,呈席状砂展布。深水重力流砂体垂向叠置厚度大,可形成规模大的油藏,大大扩展了深湖的勘探范围。研究区长6、长7油层组砂质碎屑流砂体储集层物性较好,含油性好,是重点勘探层位。
[Abstract]:Through a large number of core observation, well logging data analysis and field outcrop observation, the depositional characteristics, trigger mechanism and deposition process of deep water gravity flow in Yanchang 6Chang 7 in the southern part of Ordos Basin are studied. The sedimentary model and petroleum geological significance are systematically analyzed. The results show that there are five types of gravity flow deposits in the study area, such as sliding rock mass, sloughing deposit, sand clastic flow deposition, turbidite flow deposition and muddy clastic flow deposition. The vertical assemblages of different types of gravity flows can be divided into 5 types, and the forming process of gravity flows in the study area can be divided into five stages: delta front sedimentary stage, sliding stage, sliding deformation stage, and so on. Sand clastic flow, muddy clastic flow formation stage and turbidite flow formation stage. Sliding, sloughing sand bodies are mostly in the form of solitary lens, sand debris flow sand bodies are shown in the form of fan channels. Turbidite sand bodies are distributed in the front or flank of fan channel, distributed as sheet sand. Deep water gravity flow sand bodies have large vertical overlay thickness and can form large scale reservoirs. The reservoir physical property and oil content of sand clastic flowing sand body of Chang 6 and Chang 7 oil formations are good, which is the key exploration horizon.
【作者单位】：中国石油大学(华东)地球科学与技术学院;延长油田股份有限公司;延长油田股份有限公司勘探开发技术研究中心;国土资源部油气资源战略研究中心;
【基金】：国家自然科学基金项目(编号:41172093) 中央高校基本科研业务费专项资金(编号:15CX06002A) 中国石油大学(华东)研究生创新工程(编号:YCX2015004)联合资助~~
【分类号】：P618.13

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