比利时Campine盆地Buntsandstein砂岩储层特征及成岩作用

IF 1.2 4区 地球科学 Q2 GEOLOGY
P. Bertier, R. Swennen, R. Kemps, B. Laenen, R. Dreesen
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引用次数: 0

摘要

比利时东北部Campine盆地Buntsandstein早三叠世红层孔隙度为5.3 ~ 20.2%(平均13.7%),渗透率为0.02 ~ 296.4 mD(平均38.7 mD)。考虑到这些砂岩中潜在的二氧化碳或天然气的地质储存以及地热储层的潜力,了解它们的储层控制特性(目前尚不清楚)是非常重要的。因此,通过岩石学、稳定同位素分析、流体包裹体显微测温、x射线衍射、电子探针和孔隙渗透率岩心分析对成岩作用效果进行了评价。这些砂岩是由干旱的河流系统沉积的,在一个温暖的、干旱的气候中,有间歇性的降雨和高蒸发率。在潮湿的时期,长石被溶解。干燥期强烈的蒸发作用导致钾长石和石英过度生长、蒙脱石和方解石/白云石等溶解物质的再沉淀。沉积物的改造导致骨架颗粒被粘土包裹。粘土层在细粒沉积物中比在粗粒沉积物中发育得更好。最初构成镶边的蒙脱石在埋葬时变成伊利石。在埋藏/压实过程中,边缘粘土片的切向取向导致了伊利云母诱导的石英溶蚀作用,表现为层理平行溶蚀缝,充填粘土和云母,特别是在细粒砂岩/粉砂岩/粘土岩中。这些构成了储层内垂直流动的重要障碍。释放出来的二氧化硅并没有真正影响到红砂岩,而是被出口(通常是毫米到厘米的尺度)到附近的白化层,那里抑制成核的粘土边缘发育得不太好。砂岩的红色是由于在继承的粘土边缘中存在少量的氧化铁。下伏石炭系含煤地层排出的富含有机酸的流体运移导致粗粒地层局部白化。在颗粒较细的沉积物中,红色大部分被保留下来,这表明流体的还原能力有限。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reservoir characteristics and diagenesis of the Buntsandstein sandstones in the Campine Basin (NE Belgium)
The red beds of the Buntsandstein (Early Triassic) in the Campine Basin (NE Belgium) display porosities between 5.3–20.2% (average 13.7%) and permeabilities varying between 0.02–296.4 mD (average 38.7 mD). Knowledge of their reservoir controlling properties, which today are missing, is important in view of potential geological storage of CO2 or natural gas and geothermal reservoir potential within these sandstones. Therefore the effects of diagenesis were assessed based on petrography, stable isotope analyses, fluid inclusion microthermometry, X-ray diffraction, electron microprobe and porosity-permeability core analyses. These sandstones were deposited by a dryland river system, in a warm, mostly arid climate with episodic rainfall and high evaporation rates. During wetter periods especially feldspars were dissolved. Strong evaporation during dry periods led to reprecipitation of the dissolved species as K-feldspar and quartz overgrowths, smectite and calcite/dolomite. Sediment reworking resulted in framework grains becoming clay coated. The clay coats are better developed in finer than in coarser grained sediments. The original smectite composing the rims converted to illite during burial. The tangential orientation of the clay platelets in the rims led to illite-mica-induced dissolution of quartz during burial/compaction, which is manifested as bedding parallel dissolution seams that are filled with clays and micas, especially in the fine-grained sandstone/siltstone/claystone. These constitute important barriers to the vertical flow within the reservoir. The released silica did not really affect the red sandstones but was exported (often on mm to cm scale) to nearby bleached horizons, where nucleation inhibiting clay rims are less well developed. The red colour of the sandstones arises from the presence of small amounts of Fe-oxides in the inherited clay rims. Migration of fluids enriched in organic acids, expelled from underlying Carboniferous coal-bearing strata, resulted in local bleaching of coarser grained horizons. In the finer grained sediments, the red colour was mostly preserved, which suggests that the reductive capacity of the fluid was limited.
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来源期刊
Geologica Belgica
Geologica Belgica 地学-地质学
CiteScore
4.70
自引率
27.80%
发文量
8
审稿时长
>12 weeks
期刊介绍: Geologica Belgica is a Belgian journal that welcomes papers concerning all aspects of the earth sciences, with a particular emphasis on the regional geology of Belgium, North West Europe and central Africa. Papers not dedicated to the geology of Belgium, North West Europe and central Africa are only accepted when one of the authors is linked to a Belgian University or Institution. Thematic issues are highly appreciated. In this case, guest editors take in charge the selection of the manuscripts and the subject of the papers can be enlarged. The journal is in open access. Submitted manuscripts should be concise, presenting material not previously published. The journal also encourages the publication of papers from Belgian junior authors. Short letters are accepted. Papers written in English are preferred. Each mansucript will be reviewed by at least two reviewers.
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