海拉尔盆地呼和湖凹陷烃源岩评价

EVALUATION ON THE HYDROCARBON SOURCE ROCK IN HUHE LAKE SAG OF HAILAR BASIN

呼和湖凹陷是海拉尔盆地外围油气资源最为丰富的地区之一，广泛发育暗色泥岩、煤和炭质泥岩3种烃源岩，其中水进体系域的暗色泥岩最发育。综合分析呼和湖凹陷烃源岩有机质的丰度、类型及成熟度等指标表明3种烃源岩均达到了中等一好烃源岩级别。利用化学动力学方法建立了平行一级反应生烃动力学模型，对研究区的暗色泥岩和煤样品分别进行生烃模拟实验，并在此基础上对烃源岩原始有机质丰度及生烃潜力进行了恢复。研究认为呼和湖凹陷烃源岩发育，具有良好的油气勘探潜力。

Huhe Lake Sag is one of the most abundant oil and gas resources in the periphery of Hailar Basin. Three kinds of source rocks are widely developed in it, including dark mudstone, coal and carbonaceous mudstone. Among them, the dark mudstone is most developed in the area of transgressive system tract. The comprehensive analyses of organic matter abundance, type and maturity of the hydrocarbon source rock in the sag show that all the three kinds of source rocks have reached medium-good levels. By means of chemical kinetics method, the hydrocarbon-generating kinetics model of the parallel first-degree reaction is established, and then the hydrocarbon-generating simulating experiments on dark mudstone and coal samples are separately carried out in study area. Based on the above, the recoveries for the original organic matter abundance and hydrocarbon-generating potentials of the source rocks are conducted. The studies show that the well-developed source rocks in Huhe Lake Sag possess much better petroleum exploration potentials.