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本文根据出露于川东北、华莹山及川南等地志留系的牙形刺颜色变化指数(CAI),将上述地区分成中、高值区。根据上复二迭系及三迭系牙形刺的CAI值,推测川北广元至绵竹高桥一带为志留系CAI低值区(CAI≤2),川西南威远一带为中值区,川中为高值区。并论述了CAI值与已知油气产状的对应关系,认为川北CAI低值区是志留系石油生成和热力保存较有利的地区;CAI为中至高值的地区对石油的生成和热力保存不利,仅有生成和保存干气的可能。四川盆地内二迭系及三迭系的CAI值普遍较低,与其含有工业气藏这一事实相矛盾,说明二迭系及三迭系的天然气可能源出于下古生界。
According to the color change index (CAI) of conodonts exposed in the northeastern Sichuan, Huaying Mountain and southern Sichuan, the above areas are divided into middle and high value areas. According to the CAI values of the Upper Permian and Triassic conodonts, it is speculated that the low CAI zone (CAI≤2) of Silurian line from Guangyuan to Mianzhu and Takahashi, and the middle zone of Weiyuan in southwest Sichuan, For high value area. And discusses the correspondence between CAI value and known oil and gas production. It is concluded that the CAI low value region in northern Sichuan is favorable for petroleum generation and heat preservation in Silurian. The region with medium to high CAI is unfavorable to petroleum generation and heat preservation , Only the possibility of generating and storing dry gas. The CAI values of the Permian and Triassic systems in the Sichuan Basin are generally low, contradictory to the fact that they contain industrial gas reservoirs, indicating that the gas from the Permian and Triassic systems may originate from the Lower Paleozoic.