天然气地球科学 ›› 2022, Vol. 33 ›› Issue (3): 333343.doi: 10.11764/j.issn.1672-1926.2021.10.019
• 天然气地质学 • 下一篇
Guoli WANG1,2(),Xiaobo SONG3,Yong LIU3,Xianwu MENG3,Ke LONG3
摘要:
中三叠统雷口坡组是四川盆地西部近年来海相天然气勘探的热点层系之一,业内对其成藏条件和气藏类型的认识存在较大分歧。研究表明,川西地区雷口坡组四段油气成藏条件优越,潮坪相白云岩储层大规模稳定展布,二叠系和中三叠统雷口坡组2套烃源岩发育。雷四段在川西坳陷由西向东发育3种成藏模式,即跨层烃源断裂+裂缝复合输导的下生上储式构造气藏,小型烃源断裂+层内裂缝“接力式”输导的下生上储式构造—地层气藏,以及层内裂缝输导的自生自储式岩性气藏。除了目前已获得超千亿方探明储量的川西龙门山前雷四段构造气藏外,坳陷东侧雷口坡组四段尖灭线附近为探索构造—地层气藏的有利区域,坳陷东侧斜坡带中下部(广汉斜坡带)是探索岩性气藏的有利区域。
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