碳酸盐矿物结合有机质——一种重要的成烃物质

ORGANIC MATTER ENCLOSED IN CARBONATE MINERALS——A KIND OF IMPORTANT HYDROCARBON- PRODUCING MATTER

碳酸盐矿物结合有机质在碳酸盐岩地层中普遍存在 ,其含量与沥青A相当或高于沥青A。矿物结合有机质可作为碳酸盐岩生油岩的一种重要生烃物质。它的特殊赋存形式能将有机质保存到较高的演化阶段释放出来。当模拟实验温度为 4 50～ 50 0℃时 ,矿物结合有机质大量释放 ,可释放出 70 %左右。在高压条件下 ,释放率相对较高 ,说明在深埋条件下 ,更有利于矿物结合有机质的释放。由于矿物结合有机质的贡献 ,碳酸盐岩生油岩的生油范围会扩大 ,生油、生气强度增加。

Organic matter enclosed in carbonate minerals is widespread in carbonate rocks. The contents of enclosed organic matter are almost equal to, or higher than those of bitumen A. The organic matter, enclosed in carbonate minerals, is an important hydrocarbon producing substance in carbonate source rocks. The enclosed organic matter can be released during thermal evolution due to its special structure. When the temperature is 450℃ to 500℃ , a large amount of enclosed organic matter can release, about 70% of which released during the simulating experiments. Relatively high release under higher pressure indicates that deep seated carbonate strata are more favorable to releasing of the enclosed organic matter. Oil generating range can extend and oil and gas generating intensity can increase as a result of the contribution of enclosed organic matter.