大庆探区煤系烃源岩的生烃条件研究

大庆探区主要包括松辽及其外围盆地，勘探实践证实这些盆地在晚侏罗系、早白垩系和第三系广泛发育的煤层和煤系烃源岩层是油气生成的潜在物质基础。探讨这套烃源岩的生烃潜力对指导各研究区块的煤成烃勘探具有现实的参考价值。因此，应用有机地球化学、有机岩石学和热模拟实验技术并结合地层的沉积史和热演化史分析，系统研究了大庆探区煤系烃源岩的生烃特征及其勘探潜力。结果表明，煤系烃源岩的生油潜力分为好、中、差、非4种类型，各类煤系烃源岩的生烃特征、有机质结构和成烃模式均存在明显差异，从而影响了煤成油气的勘探方向。地质与地球化学综合研究表明，海拉尔盆地煤成油的勘探前景相对较好；汤原断陷煤成油的勘探以低熟油为主；鸡西盆地煤成油的勘探以寻找次生油藏为主：松辽盆地煤成油的勘探前景不大．以寻找煤成气为主。

A Study on Hydrocarbon Potential of Coal-measure Source Rock in Prospect Area of Daqing

Prospect Area of Daqing consists of Songliao Basin and the basins around it.The exploration confirms that coal seams and coal-measure source rocks in Upper Jurassic,Lower Cretaceous and Tertiary are potential hydrocarbon source rocks of oil and gas in these basins The studies of these hydrocarbon source rocks are significative for exploration of coal measure-derived hydrocarbon in these basins.For this reason,hydrocarbon generation and exploration potential of the coal-measure source rocks were studied using organic geochemistry,organic petrology and expermental simulation of hydrocarbon generation,combining burial history and thermal history of the source rocks.The results indicate that the hydrocarbon generation potential of the coal-measure source rocks may be divided into four kinds,i e. good source rock,middle source rock,poor source rock,non-source rock.They affect exploration of coal measure-derived hydrocarbon because their hydrocarbon generation characteristic and hydrocarbon generation model are different.The comprehensive study on geology and geochemistry indicates that the exploration prospects for coal measure-derived oil are better in Hailaer basin,the exploration objective for coal measure-derived oil is low mature oil in Tangyuan Rift,the exploration objective for coal measure-derived oil is secondary oil pool in Jixi basin,the exploration prospects for coal measure-derived hydrocarbon is coal-related gas.