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首页> 外文期刊>Marine and Petroleum Geology >Porosity preservation in reservoir sandstones due to grain-coating illite: a study of the jurassic garn formation from the kristin and lavrans fields, offshore mid-norway
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Porosity preservation in reservoir sandstones due to grain-coating illite: a study of the jurassic garn formation from the kristin and lavrans fields, offshore mid-norway

机译：覆有伊利石的储层砂岩中的孔隙保持作用：中北部沿海克里斯汀和拉夫兰斯油田侏罗纪加仑形成的研究

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摘要

The Garn Formation is an important reservoir-sandstone in the Haltenbanken area. The Garn Formation from the Kristin field is deeply buried (4.6-4.9 km) but displays higher porosity values compared to the general porosity trend in the region. In the Lavrans field the same formation is extensively quartz cemented with low porosity values despite its shallower depth (4.4-4.5 km). Porosity is controlled by grain coatings preventing quartz overgrowth. It is well known that chlorite coatings inhibit quartz cementation, but our observations show that illite and illite/chloride coatings can also be effective in preventing quartz precipitation. The grain-coating illite and chloride in the studied wells may have developed from a smectitic precursor that formed from volcano-clastic material at lower temperatures. Bitumen covers the grains in many of the samples, but the bitumen formed too late to significantly affect quartz overgrowths and has not contributed to preservation of porosity.
机译：Garn组是Haltenbanken地区重要的储层砂岩。克里斯汀油田的加恩组被深埋（4.6-4.9 km），但与该地区的总体孔隙率趋势相比，孔隙率值更高。在Lavrans油田中，尽管深度较浅（4.4-4.5 km），但相同的地层是孔隙度较低的大量石英胶结物。孔隙率由防止石英过度生长的晶粒涂层控制。众所周知，亚氯酸盐涂层会抑制石英胶结，但是我们的观察结果表明，伊利石和伊利石/氯化物涂层也可以有效防止石英沉淀。研究井中的覆晶伊利石和氯化物可能是由火山岩碎屑物质在较低温度下形成的近晶前体形成的。沥青覆盖了许多样品中的晶粒，但是沥青形成的时间太晚，无法显着影响石英的过度生长，并且没有有助于保持孔隙度。

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