Relationship between diagenesis, porosity reduction, and oil emplacement in late Carboniferous sandstone reservoirs, Bothamsall Oilfield, E Midlands
Relationship between diagenesis, porosity reduction, and oil emplacement in late Carboniferous sandstone reservoirs, Bothamsall Oilfield, E Midlands
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DOI：
10.1144/gsjgs.135.1.0007
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发表时间：
1978-01
影响因子：
2.7
通讯作者：
P. J. Hawkins
中科院分区：
文献类型：
--
作者：
P. J. Hawkins
在Bothamsall油田，下煤系底部砂岩储层由分流河道相和堰坝相组成。成岩作用主要是通过化学作用实现的，障坝相中广泛分布着混层的伊利/蒙脱石粘土、铁白云石和铁方解石；河道相中有重要的石英、铁白云石和高岭石；漫滩相中主要有石英、铁白云石和菱铁矿。位于河道相轴线区域的粗粒砂岩孔隙度保留率最高，石英胶结为主的细粒砂岩孔隙度保留率最低。在河道相粗砂岩中早期的石油侵位阻止了石英的成岩作用，并抑制了进一步的成岩反应，而在贫瘠的充水区，成岩作用没有受到阻碍。
In the Bothamsall Oilfield, sandstone reservoirs at the base of the Lower Coal Measures comprise distributary-channel and barrier-bar facies. Diagenetic modifications were achieved principally by chemical processes, with mixed-layer illite/montmorillonite clay, ferroandolomite and ferroancalcite widespread in the barrier-bar facies; quartz, ferroandolomite, and kaolinite important in the channel facies; and quartz, ferroandolomite and siderite prevalent in the overbank facies. Porosity retention is greatest in coarse-grained sandstone located in the axial region of channel facies, and least in fine-grained sandstone where quartz cementation predominates. Early oil emplacement in coarse-grained sandstone of the channel facies arrested quartz diagenesis and inhibited further diagenetic reactions, whereas in barren water-filled zones diagenesis proceeded unimpeded.