岩性油气藏 ›› 2024, Vol. 36 ›› Issue (2): 8998.doi: 10.12108/yxyqc.20240209
• 地质勘探 • 上一篇
岑永静1, 梁锋1, 王立恩1, 刘倩虞1, 张鑫哲2, 丁熊2
CEN Yongjing1, LIANG Feng1, WANG Lien1, LIU Qianyu1, ZHANG Xinzhe2, DING Xiong2
摘要: 通过钻井、岩心、测录井及地震资料的综合分析,系统研究了四川盆地蓬莱—中江地区震旦系灯影组二段气藏的成藏特征。研究结果表明:①四川盆地灯影组沉积期,随着海水侵入,古陆多被淹没或侵蚀夷平,盆地逐渐演变为碳酸盐岩台地。灯二上亚段沉积期,川中北斜坡蓬莱—中江地区以发育台地边缘滩相和台地边缘丘相为特色,并可细分为滩核、滩缘、滩间海、丘核、丘缘、丘间海6种亚相,是储层发育的有利相带。②研究区灯二上亚段储层以藻云岩、藻砂屑云岩为主要储集岩,发育残余粒间孔+粒间溶孔型、粒内溶孔+藻格架孔型、裂缝型与孔洞型4种类型的储层,储层厚度分布特征与沉积相分布特征较吻合,位于台地边缘丘滩核的储层累积厚度大。③研究区灯二上亚段气藏的天然气主要来源于筇竹寺组烃源岩,烃源岩厚度大、有机碳含量及热演化程度高,气藏具备较好的烃源条件和封盖条件,具有“上生下储上盖”和“旁生侧储上盖”2种较好的生-储-盖配置关系。④研究区油气充注主要发生于三叠纪—白垩纪,为多期“准连续”型,灯二上亚段气藏主要经历了奥陶纪—志留纪古油气藏聚集阶段、志留纪—石炭纪古油藏破坏阶段、二叠纪—三叠纪再次生烃成油藏阶段和三叠纪—侏罗纪原油裂解生气阶段。
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