石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (5): 1146-1158.doi: 10.11743/ogg20210512
刘畅1(), 张道旻2, 李超2, 路媛媛1, 于姗姗2, 郭明强1
收稿日期:
2020-07-28
出版日期:
2021-10-28
发布日期:
2021-10-26
作者简介:
刘畅(1989-), 男, 博士、工程师, 石油地质。E-mail: 基金资助:
Chang Liu1(), Daomin Zhang2, Chao Li2, Yuanyuan Lu1, Shanshan Yu2, Mingqiang Guo1
Received:
2020-07-28
Online:
2021-10-28
Published:
2021-10-26
摘要:
鄂尔多斯盆地东缘临兴区块上古生界致密砂岩气资源潜力巨大,多层系发育优质气层,预测致密砂岩气资源量超千亿方,但构造背景特殊、储层非均质性强,造成气-水分布规律复杂,成藏地质条件及主控因素复杂多变,勘探开发难度较大。立足于系统梳理临兴区块致密砂岩气藏成藏条件,从平面上沉积模式、垂向上的生-储-盖组合及其耦合关系、时空上的气-水分布规律和天然气成藏过程中的差异聚集特征入手,揭示研究区整体非均质性背景下的差异富集规律,指导鄂尔多斯东缘千亿方大气田的勘探及高效开发。明确了烃源岩-储层-输导体系的配置关系:煤系烃源岩有机质丰度高,生烃潜力好,为大气田的形成奠定了基础;断裂的适度发育纵向沟通了煤系烃源岩及海相障壁海岸-潮坪及陆相河流-浅水三角洲沉积体系的砂岩储层,纵向上构成了下部源内、中部近源和上部远源3套成藏组合。深化了储层致密化成因及致密砂岩气成岩-成藏耦合关系,指出致密砂岩气藏具有“先致密后成藏”的特征。剖析了致密砂岩气藏天然气运移聚集机制,认为烃源岩生烃形成的超压是天然气运移的主要动力。建立了充足气源条件下、不同构造区带的多层系准连续选择性成藏模式,提出致密砂岩气具有“烃源控潜、构造控区、微相控储、物性控藏”的特点。天然气在烃源岩大量持续生烃背景下,优先选择断裂适度发育,构造活动强度适中,有利砂体及高渗物性条件背景下聚集成藏。
中图分类号:
图5
鄂尔多斯盆地临兴区块上古生界储层孔隙类型 a.残余原生粒间孔,L-1井,盒1段,埋深1 540.55 m,铸体薄片;b.残余原生粒间孔,L-8井,盒2段,埋深1 479.85 m,扫描电镜;c.粒间溶孔,L-10井,山1段,埋深1 811.06 m,铸体薄片;d.方解石胶结物溶蚀孔,L-48井,盒8段,埋深1 809.49 m,铸体薄片;e.长石粒内溶孔,L-101井,太2段,埋深1 838.24 m,铸体薄片;f.石英颗粒溶蚀形成粒内溶孔,L-104井,山2段,埋深1 764.11 m,扫描电镜;g.高岭石晶间孔隙,L-4井,太2段,埋深1 804.48 m,铸体薄片;h.高岭石晶间孔隙,L-9井,盒7段,埋深1 675.55 m,扫描电镜;i.构造作用产生的微裂隙,L-4井,盒7段,埋深1 552.60 m,铸体薄片"
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