民和盆地侏罗系生烃潜力与油气勘探方向

从有机碳含量、可溶有机质含量及其转化率、热解参数、饱和烃的生物表示化合物特征、有机岩石学特征几个方面分析了民和盆地侏罗系烃源岩的有机质丰度、类型和成熟度,并进行了地球化学特征分析和生烃潜力评价。分析认为盆地发育湖相泥岩和煤系两大类烃源岩,有机质以较富含低等水生生物原始母质的腐泥腐殖型为主,主要分布于中侏罗统。通过对盆地石油地质条件的评价,结合各区带落实认识程度和资料品质条件认为:武家鼻隆构造带是最有利的勘探区带,万泉堡鼻状构造带具有良好勘探潜力,大庄构造带是寻找浅层次生油气藏的有利区带。永登凹陷面积大,资源丰富,勘探认识程度低,具有良好勘探前景。

Evaluation on hydrocarbon generation potentials and exploration in Jurassic Minhe Basin

Based on the comprehensive analysis of the organic carbon content,the content and conversion ratio of organic matter,parameters of pyrolysis,organic petrology parameters,biomarker characters of saturated hydrocarbon and stable carbon isotope composition of individual hydrocarbon,geochemical characters of Jurassic source rock samples in Minhe Basin and the organic matter's abundance,type and maturity are studied,and hydrocarbon generation potential are evaluated.The result shows that the source rocks are coal-measure rocks and lacustrine mud,and the organic matter which is abundant in mid-Jurassic is marine inferior creatures.Most of the organic matters are of type 2 and 3,few of them are of type 1.According to the evaluation of the petroleum geology in this basin and based on the research of belts and data quality,Wujia nose-uplift structural belt is the most favorable region;Wanquan nose structural belt is of good potential;Dazhuang structural belt is one of the favorable zone for shallow secondary reservoir.Yongdeng depression is prospective because of its big enough area,abundant resource and low exploration and research degree.