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塔里木盆地大宛齐油田的部分原油经受了不同程度的微生物降解作用,其原油的分子组成变化能较好地反映微生物降解作用对Mango轻烃参数的影响。对大宛齐原油轻烃组成分析发现,主体原油的Mango相关轻烃参数均呈现出陆相来源的分布特征,K1值、K2值基本保持一致,原油来源相近;随微生物降解程度的增加,Mango轻烃参数K1值减小、K2值增大,N~6_1/N~5_1值和(N~6_1+N~5_1)/(P2+P3+N_2)值整体上也呈现出减小的趋势。在大宛齐主体原油中,DW1区的N~6_1/N_2值、P2/P3值较高,DMCYC_5/MCYC_6值和MCYC_5/CYC_6值较低;而DW105西区的N~6_1/N_2值、P2/P3值则偏低,DMCYC_5/MCYC_6值和MCYC_5/CYC_6值却较高,这个区域性的分布特征可能预示大宛齐地区存在来自北部和西部的2股油气的汇入。
Part of the crude oil in Dayawazi Oilfield of Tarim Basin has undergone different degree of microbial degradation. The molecular composition of crude oil can better reflect the effect of microbial degradation on Mango light hydrocarbon parameters. The analysis of composition of light hydrocarbon in Dawanqi crude oil shows that the distribution of Mango-related light hydrocarbons in the main crude oil shows the distribution of terrestrial sources. The values of K1 and K2 are basically the same and the sources of crude oil are similar. With the increase of microbial degradation, Mango The value of light hydrocarbon parameter K1 decreased and K2 value increased. The values of N ~ 6_1 / N ~ 5_1 and (N ~ 6_1 + N ~ 5_1) / (P2 + P3 + N_2) also showed a decreasing trend as a whole. In Dawanqi crude oil, N ~ 6_1 / N_2 value, P2 / P3 value and DMCYC_5 / MCYC_6 value and MCYC_5 / CYC_6 value were lower in DW1 area; while N ~ 6_1 / N_2 value and P2 / The value of P3 is low, the value of DMCYC_5 / MCYC_6 and the value of MCYC_5 / CYC_6 are higher. This regional distribution may indicate that there are two oil and gas inflows from the north and west of Dawanqi.