天然气地球科学 ›› 2019, Vol. 30 ›› Issue (10): 14511464.doi: 10.11764/j.issn.1672-1926.2019.07.016
马奎1(),沈平2,汪泽成3,田兴旺1,彭翰霖1,汪华1,张玺华1,孙奕婷1,罗冰1,王云龙1,杨岱林1
Kui Ma1(),Ping Shen2,Ze-cheng Wang3,Xing-wang Tian1,Han-lin Peng1,Hua Wang1,Xi-hua Zhang1,Yi-ting Sun1,Bing Luo1,Yun-long Wang1,Dai-lin Yang1
摘要:
近年来,四川盆地川中古隆起轴部发现了安岳特大型气田,主要目的层为震旦系灯影组、寒武系龙王庙组。但对古隆起斜坡区的成藏问题探讨较少,直接制约了油气勘探突破和发现。基于野外、钻井岩心和地球物理资料分析,重点论述川中古隆起北斜坡龙王庙组“四古”(古颗粒滩体、古老烃源岩、古圈闭和古构造)对成藏控制作用,并对勘探潜力进行评价。研究表明:①北斜坡龙王庙组沉积期颗粒滩体叠置发育,为准同生期岩溶作用形成粒间孔、粒内孔等类型储集空间形成提供物质基础;②北斜坡紧邻德阳—安岳裂陷,下寒武统筇竹寺组优质烃源岩为天然气聚集提供了充足的气源;③斜坡构造背景下发育的岩性—地层和岩性—构造复合类古圈闭为油气聚集提供有效聚集空间;④古构造多期活动和调整控制油气成藏演化;⑤川中古隆起北斜坡龙王庙组油气成藏条件优越,勘探取得突破的关键在于寻找活动强度较弱的断层附近的岩性—地层和岩性—构造圈闭。不同类型天然气藏发育有利分布区总面积达3 652km2,资源量大,勘探前景广阔。
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