松辽盆地查干花地区营城组火山岩气藏气体组份差异性及其控制因素分析

Analysis of Gas Composition Difference and Its Controlling Factors of Yingcheng Formation Volcanic Gas Reservoir in Chaganhua Area, Songliao Basin

陈亮

CHEN Liang

中国石油化工股份有限公司胜利油田分公司勘探开发研究院，山东东营　257000

Research Institute of Petroleum Exploration & Development, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257000, China

松辽盆地查干花地区火山岩勘探取得了比较好的效果，而不同区带气藏组分存在差异。通过对比分析凸起带及凹陷带探井中气藏的气体成因、分布特征及其差异，明确了一级基底大断裂及其分支的二级断裂为幔源气的运移通道，而缓坡带的三级断裂为烃类气的运移通道，输导断裂的类型决定了气藏中CO2和烃类气的含量。建立了查干花地区含CO2气藏运聚成藏模式，合理解释了该地区含CO2天然气的勘探现状和复杂分布问题,为CO2和烃类气的钻前预测提供了理论依据。

Good results have been achieved in volcanic rock exploration in Chaganhua area of Songliao Basin, but there are differences in gas reservoir composition in different zones. Through comparative analysis of the gas genesis, distribution characteristics and differences of the gas reservoirs in the exploration wells in the uplift zone and the depression zone, it is clear that the first-level basement faults and branched second-level faults are the migration channels for mantle-derived gas, while the third-level faults in gentle slope belt are the migration pathways of hydrocarbon gas. Besides, the types of migration faults determine the content of CO2 and hydrocarbon gas in the gas reservoir. The model of gas migration and accumulation in Chaganhua area was established, which reasonably explains the gas exploration status and complex distribution problems. Finally, it provides a theoretical basis for pre-drilling prediction of CO2 and hydrocarbon gas.

https://doi.org/10.3969/j.issn.1008-2336.2020.03.019