摘要:
采自德令哈地区石炭系的12个碳酸盐岩样品测试、分析结果表明,德令哈地区石炭纪整体为分层中等的弱还原海相环境,水体受陆源碎屑注入影响明显。这种湿热、还原的高盐度水体利于生物的繁盛及有机质的保存,使德令哈地区石炭系发育极为优越的烃源岩条件。垂向上,克鲁克组偏高的咸化程度及分层程度,表明克鲁克组沉积水体相对闭塞、咸化程度较高,而怀头他拉组、扎布萨尕秀组灰岩形成于水体交换相对通畅的海域。从岩性组合、陆源碎屑注入变化及盐度、还原性的差异来看,克鲁克组主体为局限台地环境,而怀头他拉组、扎布萨尕秀组为开阔台地。作为对克鲁克组高盐度、还原性水介质环境的响应,克鲁克组烃源岩TOC条件要比怀头他拉组及扎布萨尕秀组优越。
Abstract:
The analyses of 12 pieces of carbonate rock samples from the Carboniferous strata in the Delingha Basin, Qinghai have reflected that during the Carboniferous, the Delingha area was once in the marine saline water environments with saline and dysaerobic sea water, humid and highly evaporated conditions, and plenty of terrigenous supply. This type of humid and reducing environments may be favourable for the propagation of organisms and preservation of organic matter, and thus may be the ideal sites for the development of the Carboniferous source rocks. Vertically, higher salinity and stratification of sea water in the Keluke Formation suggest the relatively enclosed and salinized sea water in the restricted carbonate platform environment, while in the Huaitoutala and Zhabusagaxiu Formations, the sea water was well connected in the open carbonate platform environment. It can be seen that the total organic contents in the Keluke Formation are higher than those in the Huaitoutala and Zhabusagaxiu Formations in the Delingha Basin.
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