岩性油气藏 ›› 2021, Vol. 33 ›› Issue (1): 175185.doi: 10.12108/yxyqc.20210116
孔红喜, 王远飞, 周飞, 朱军, 陈阳阳, 宋德康
KONG Hongxi, WANG Yuanfei, ZHOU Fei, ZHU Jun, CHEN Yangyang, SONG Dekang
摘要: 鄂博梁构造带各构造均钻有以古近系—新近系为目的层的探井,但含气丰度很低,一直未能实现勘探的实际突破,同时限于侏罗系烃源岩层埋深较大,成藏富集规律认识不清。近年来随着勘探程度的不断提高,多口探井钻达侏罗系地层,为进一步深入研究奠定了基础。通过对鄂博梁构造带烃源岩、天然气地球化学特征以及运聚条件的详细分析,开展了成藏条件的综合研究。结果表明:处于边缘地区的牛东鼻隆—鄂博梁Ⅰ号构造有机质丰度不高、成熟度很低,不具备大规模形成天然气的烃源岩条件。目前已发现的天然气为高成熟、过成熟的煤型气,来自凹陷中心形成的高成熟烃源岩,侏罗系顶面广泛分布的不整合与沟通源岩的断层是主要的输导途径。鄂博梁构造带进一步的勘探工作应选择凹陷中心烃源岩成熟度高的地区,目的层应尽可能贴近源岩。该研究成果为鄂博梁构造带进一步勘探指出了有利勘探地区。
中图分类号:
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