也门1区块白云岩成因及其对油气成藏的影响

发布时间：2018-01-25 05:54

本文关键词： 白云岩化热液作用白云岩储层保存条件油气成藏　出处：《油气地质与采收率》2017年03期 　论文类型：期刊论文

【摘要】：通过对也门1区块白云岩分布、岩性特点、颜色以及白云岩矿物电镜扫描特征的分析,研究白云岩化过程对油气成藏的影响。也门1区块白云岩具有厚度大、分布范围狭窄的特点,主要分布在Imad-1井附近。白云石晶体多呈白糖状,具有鞍状白云岩的主要特征,虽见介壳化石,但仅保留了原来的痕迹,且在岩心和薄片中未见生物成因白云岩的球状、不规则针刺状或菱形晶体特征。也门1区块白云岩颜色较深,呈灰—深灰色,表明其富含铁、锰元素。上述特征均指向也门1区块白云岩为热液成因,推测热液主要源自深部富含镁离子的液体,沿不整合面或者断层渗入到相关地层中,与地层中富含钙离子的灰岩、石膏等进行交换,最终形成了分布局限、厚度较大的白云岩。白云岩在形成了有利储集空间的同时,也对盖层和保存条件造成了破坏,加上断层的影响,研究区东南部区域形成规模油气藏的潜力不大,建议未来也门1区块的勘探应集中在西北部的玛格拉夫劳达构造带。
[Abstract]:Based on the analysis of dolomite distribution, lithologic characteristics, color and electron microscope scanning characteristics of dolomite minerals in block 1 of Yemen, the influence of dolomitization on oil and gas accumulation is studied. The dolomite in block 1 of Yemen has a large thickness. The distribution of dolomite crystals is mainly in the vicinity of Imad-1 well. The dolomite crystals are mostly sugary and have the main characteristics of saddle dolomite. Although the fossils of the crust are found, only the original traces are retained. Moreover, there are no spherical, irregular needle-like or rhomboid crystal characteristics of biogenic dolomite in cores and thin slices. The dolomite in block 1 of Yemen is dark in color and gray in gray, indicating that it is rich in iron. Manganese elements. All the above characteristics indicate that dolomite in block 1 of Yemen is hydrothermal origin, which is mainly derived from the liquid rich in magnesium ions in the deep, and seeps into the relevant strata along the unconformable surface or fault. The limestone and gypsum which are rich in calcium ions in the strata are exchanged, and finally the dolomite with limited distribution and thick thickness is formed, and the dolomite forms favorable reservoir space at the same time. It has also caused damage to the caprock and preservation conditions, plus the influence of faults, the potential for the formation of large-scale oil and gas reservoirs in the southeastern region of the study area is not large. It is suggested that the exploration of block 1 in Yemen should be concentrated in the northwestern Magaflauda tectonic belt.
【作者单位】：中国地质调查局油气资源调查中心;中国石化集团国际石油勘探开发有限公司;振华石油控股有限公司;
【基金】：中国石化海外油气勘探项目“Yemen Shabwa省1区块(Amakeen)PSA项目”
【分类号】：P618.13
【正文快照】： 也门1区块目前已有8口探井,全部钻遇基底,并在部分层段见到一定油气显示,尚未有商业价值油气发现。分析钻探结果发现,位于区块中南部的Imad-1井与其余7口井岩性显著不同。其他7口井从侏罗系的休库拉组、密穆组、莱姆组一直到白垩系的萨尔组下部所钻遇地层分别为灰岩、炭质灰岩

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