天然气地球科学 ›› 2021, Vol. 32 ›› Issue (12): 17491761.doi: 10.11764/j.issn.1672-1926.2021.07.016
• 天然气地质学 • 下一篇
付金华1,2(),郭雯1,3(),李士祥1,3,刘显阳1,3,程党性1,3,周新平1,3
Jinhua FU1,2(),Wen GUO1,3(),Shixiang LI1,3,Xianyang LIU1,3,Dangxing CHENG1,3,Xinping ZHOU1,3
摘要:
鄂尔多斯盆地三叠系延长组7段(长7段)沉积期为湖盆发育鼎盛阶段,发育一套以富有机质泥页岩为主夹砂质沉积的烃源岩层系。多年来,针对这套烃源岩层系的地质特征与勘探开发潜力,开展了一系列理论研究与技术攻关,结果表明:长7段主要发育夹层型和页岩型2类页岩油,其中夹层型页岩油可进一步细分为重力流夹层型和三角洲前缘夹层型,页岩型页岩油可进一步细分为纹层页岩型和页理页岩型。重力流夹层型页岩油受到湖盆中部优质烃源岩的高强度充注影响,砂质储层长英质含量高,可压裂性好,微米级孔隙众多,连通性好,目前在庆城油田已实现规模效益开发。三角洲前缘夹层型页岩油厚层砂岩储层横向连续性好,油气侧向运移成藏,砂质储层孔隙度较大,目前水平井试验攻关已获得突破,是现实的后备领域。纹层页岩型页岩油单砂体厚度薄、泥质含量高,致使优质储层钻遇率低,但油气充注程度高,“甜点”评价标准的确定与开发技术的突破是下一步的攻关方向,远景资源量巨大。页理页岩型页岩油储层长英质矿物含量高,纹层发育,孔隙度小于2%,储集空间小,结构复杂,烃类恢复预测资源量巨大,目前泥页岩储层的风险勘探与原位转化技术攻关都在稳步推进。
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