石臼坨凸起东段沙一、二段沉积时期物源剥蚀量与砂砾岩沉积量关系

发布时间：2018-04-27 08:51

本文选题：石臼坨凸起东段 + 沙一、二段　；参考：《中国海上油气》2017年04期

【摘要】：定量表征某一地质时期物源区剥蚀量及被搬运到湖盆中的砂砾岩量是一个具有挑战性的难题。利用钻井、地震等资料,结合薄片、重矿物、微量元素、锆石测年等分析化验资料,运用物源示踪法、地层厚度趋势法以及沉积速率法,对渤海石臼坨凸起东段古近系沙一、二段沉积时期物源剥蚀作用与砂砾岩沉积之间的定量关系进行了探讨。结果表明,沙一、二段沉积时期石臼坨凸起东段发育5个近源扇三角洲,其中东部2个扇三角洲的真实物源为中生界火成岩,西部3个扇三角洲真实物源主要为中生界碎屑岩夹火成岩。物源剥蚀量与砂砾岩沉积量之间呈明显正相关,火成岩物源比碎屑岩物源具有更高的成砂率,且沉降中心越靠近物源成砂率越高。研究区东部扇体A更有利于形成厚层优质砂砾岩储层。本文研究成果可为在勘探程度较低的陡坡带定量预测砂岩储层发育程度和规模提供借鉴。
[Abstract]:It is a challenging problem to quantitatively characterize the denudation amount of the provenance and the amount of sand and gravel transported to the lake basin in a certain geological period. Using drilling, seismic and other data, combining the analysis and analysis of sheet, heavy minerals, trace elements, zircon dating, and using source tracer method, stratigraphic thickness trend method and sedimentation rate method, the Paleogene SHA1 in the eastern segment of Shiyutuo uplift in Bohai Sea is studied. The quantitative relationship between the denudation of provenance and the deposition of sandy gravel in the second stage was discussed. The results show that there are five near-source fan deltas developed in the eastern member of Shiyutuo uplift during the first and second sedimentary periods of Sha 1 and 2, and the true source of the two fan deltas in the eastern part is Mesozoic igneous rocks. The real provenances of the three fan deltas in the west are mainly Mesozoic clastic rocks intercalated with igneous rocks. There is a significant positive correlation between the denudation amount of the material source and the amount of sandy gravel deposit. The igneous source has a higher sand formation rate than the clastic source, and the sedimentation center is closer to the material source and the sand formation rate is higher. Fan A in the eastern part of the study area is more conducive to the formation of thick layer high quality sandy gravel reservoir. The research results in this paper can provide reference for quantitative prediction of sandstone reservoir development and scale in steep slope zones with low exploration degree.
【作者单位】：中海石油(中国)有限公司天津分公司;
【基金】：“十三五”国家科技重大专项“渤海海域勘探新领域及关键技术研究(编号:2016ZX05024-003)”部分研究成果
【分类号】：P618.13

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