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河流相层序地层及岩性油气藏油气富集规律——以准噶尔盆地红29三维工区为例

Li-ping ZHANG,Xuan CHEN,Chang-min ZHANG,Shang-feng ZHANG

Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition)（2010）

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Abstract
以准噶尔盆地红山嘴油田红29三维工区中三叠统克拉玛依下亚组(克下组)为研究对象,根据钻井和测井资料对其进行高分辨率层序地层划分,识别出1个长期基准面旋回和3个中期基准面旋回(MSC1、MSC2、MSC3).在长期基准面旋回从上升到下降的过程中,河道弯曲指数明显出现低-高-低的分异特征,河道砂体连续性表现为好-差-好的演变.通过分析克下组油藏以及出油气特征,发现油气主要富集于MSC2中期基准面旋回中;该中期旋回内河道弯曲度较高,河道砂体连续性较差.结合岩性油气藏的成藏规律,总结出"富砂中找贫砂"的勘探思路.该思路指出,长期基准面上升到最高位置附近的"贫砂"层系也是岩性油气藏发育的有利层位,并提出断层-岩性型复合圈闭为有利的勘探目标.
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Key words
Fluvial facies,Hydrocarbon accumulation,Middle scale cycle,Middle-Triassic,Sandstone,The Junggar basin
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