岩性油气藏 ›› 2024, Vol. 36 ›› Issue (5): 2534.doi: 10.12108/yxyqc.20240503
周刚1, 杨岱林1, 孙奕婷1, 严威1, 张亚1, 文华国2, 和源1, 刘四兵2
ZHOU Gang1, YANG Dailin1, SUN Yiting1, YAN Wei1, ZHANG Ya1, WEN Huaguo2, HE Yuan1, LIU Sibing2
摘要: 综合利用野外露头、钻井岩心分析、测录井及地震剖面等资料,对四川盆地及周缘寒武系沧浪铺组沉积充填过程开展了系统研究。研究结果表明:①四川盆地寒武系沧一段的沉积构造格局整体表现为“一隆、四洼、两高带”,岩性以碳酸盐岩为主;沧二段地层厚度差异性较小,区域地貌趋于均一,岩性以碎屑岩为主。②研究区寒武系沧一段沉积时期,平面上具有东西分异的沉积特征,主要受德阳—安岳古裂陷槽隔挡作用影响。裂陷槽西侧靠近物源区,主要发育混积潮坪沉积,裂陷槽东侧则广泛发育清水碳酸盐岩沉积;沧二段沉积时期,因裂陷槽隔挡作用减弱,全盆陆源碎屑沉积大幅增加,整体上以碎屑岩浅水陆棚沉积为主。③研究区寒武系沧一段优质白云岩储层以残余鲕粒云岩、砂屑云岩和粉晶云岩为主,宏观上颗粒滩的分布主要受到水下低隆和台洼边缘相对高部位控制,微观上储集空间主要受白云石化作用及溶蚀改造作用控制,发育粒内溶孔、粒间溶孔、晶间溶孔和晶间孔等孔隙类型,紧邻下伏筇竹寺组优质烃源岩,具有近源充注成藏的天然优势。
中图分类号:
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