应用定量颗粒荧光技术研究准噶尔盆地腹部侏罗系油气运聚规律

来源期刊:中南大学学报(自然科学版)2014年第11期

论文作者:周勇水 邱楠生 曹环宇 贾京坤

文章页码:3866 - 3877

关键词:准噶尔盆地腹部;侏罗系储层;定量颗粒荧光技术;包裹体;油气运聚规律

Key words:hinterland of Junggar Basin; Jurassic reservoirs; quantitative grain fluorescence techniques; fluid inclusion; regular pattern of hydrocarbon migration and accumulation

摘    要:准噶尔盆地腹部侏罗系油气运聚规律不明,导致油气勘探受阻。为揭示油气在侏罗系内的运聚规律,在储层岩心含油包裹体观察及丰度统计的基础上,利用定量颗粒荧光技术进行研究。研究结果表明:准噶尔盆地腹部J1s22和J1s212泥岩隔夹层发育层段的样品具有高的GOI值和强烈的轻质油QGF及QGF-E荧光响应特征,达到油藏标准值;随着深度增加,各指标逐渐降低,至J1s211大套板状砂岩发育层段,样品的各项指标只达到油气运移通道值或水层值;侏罗系早期经受过较大规模轻质油充注,但之后发生泄漏;油气进入J1s储层后,首先在浮力作用下快速垂向运移至有泥岩封隔层封堵的J1s22和J1s212,然后沿着泥岩隔层底面往低势区侧向运移,直至遇到侧向封堵性好的砂体才能成藏,这表明识别有效的侧向封闭对准噶尔盆地腹部侏罗系油气勘探有重要意义。

Abstract: Considering that the regular pattern of hydrocarbon migration and accumulation in Jurassic reservoirs in the hinterland of Junggar Basin is not clear, which makes petroleum exploration in this area more hindrance, grains containing oil inclusions (GOIs) and quantitative grain fluorescence (QGF and QGF-E) techniques were carried out to reveal the regular pattern of hydrocarbon migration and accumulation in Jurassic reservoirs in the hinterland of Junggar Basin. J1s22 and J1s212 in Jurassic reservoirs, where there exist effective lateral and vertical seal rocks, display very high GOI values and strong light oil QGF and QGF-E responses, greater than the generally accepted threshold value for an oil column, which suggests that J1s22 and J1s212 charged initially by massive light oil, and leaked. The GOI values and QGF and QGF-E responses drastically reduce with the increase of depth. Sandstones of J1s211 in Jurassic reservoirs are thick and their lateral distribution is stable and continuous. However, the GOI values and QGF and QGF-E responses of J1s211 only indicate an oil secondary migration pathway or water zone. The distribution of GOI values and QGF and QGF-E responses indicate that oil firstly moves up to J1s22 and J1s212 via J1s211 by the effect of buoyancy because of the lack of vertical closure rocks in J1s211.Then the oil migrates under the cap rock and is accumulated in the sand unites with effective lateral seal, showing that high-quality lateral seals have important implication for petroleum exploration in Jurassic in the hinterland of Junggar Basin.

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