辽西金羊盆地下侏罗统北票组页岩气地球化学特征及其成因

发布时间：2018-03-24 10:21

本文选题：成因分析　切入点：地球化学特征　出处：《地质通报》2017年04期

【摘要】：金岭寺-羊山盆地(金羊盆地)是中国北方侏罗系发育最完备的地区之一,盆地内充填的下侏罗统北票组为一套湖相泥岩,具有良好的油气潜力。在金羊盆地章吉营子凹陷西缘布置实施的4口地质调查井中,有3口井见油气显示。通过对SZK2及SZK3钻井岩心进行现场解析,北票组泥页岩在浅层测试到可观的页岩气含量,且随着深度的变化,总含气量及甲烷含量有所增加。另外,其总含气量与有机碳含量呈良好的正相关关系,是影响页岩含气量的关键因素。对比金羊盆地北票组泥页岩吸附气C同位素特征,其气体成因主要存在生物成因气和煤型气2种类型,表明下侏罗统北票组页岩气具有混合多成因的特征。通过X衍射分析综合评价,金羊盆地下侏罗统北票组泥页岩压裂条件好、天然气吸附能力强,具备一定的页岩气勘探前景,是有利的页岩气勘探开发新层系。
[Abstract]:Jinlingsi-Yangshan Basin (Jinyang Basin) is one of the most developed areas of Jurassic in North China. The Beipiao formation of Lower Jurassic is a set of lacustrine mudstone. It has good oil and gas potential. Of the 4 geological survey wells arranged in the western margin of Zhangjiyingzi sag in Jinyang Basin, 3 wells show oil and gas. The core of SZK2 and SZK3 drilling is analyzed in situ. The content of shale gas in shallow layer of Beipiao formation shale is considerable, and the total gas content and methane content increase with the change of depth. In addition, there is a good positive correlation between total gas content and organic carbon content. Compared with the C isotopic characteristics of shale adsorbed gas in Beipiao formation, Jinyang Basin, there are mainly two types of biogenic gas and coal type gas. The results show that the shale gas of Beipiao formation of Lower Jurassic has the characteristics of mixed multi-genesis. Through the comprehensive evaluation of X-ray diffraction analysis, it is found that the shale shale of Beipiao formation of Lower Jurassic in Jinyang Basin has good fracturing conditions, strong adsorption capacity of natural gas and a certain prospect of shale gas exploration. It is a favorable new series of shale gas exploration and development.
【作者单位】：中国地质调查局沈阳地质调查中心;中国石油辽河油田分公司;长江大学;
【基金】：中国地质调查局项目《松辽外围南部盆地群油气基础地质调查》(编号:DD20160167)和《辽宁金羊盆地油气基础地质调查》(编号:12120115001301)
【分类号】：P618.13

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