岩性油气藏 ›› 2026, Vol. 38 ›› Issue (5): 7182.doi: 10.12108/yxyqc.20260507
青春1(
), 吴学妍2(
), 唐松1, 刘博文1, 淦文杰1, 余燕1, 梁新玉1, 廖月1
QING Chun1(
), WU Xueyan2(
), TANG Song1, LIU Bowen1, GAN Wenjie1, YU Yan1, LIANG Xinyu1, LIAO Yue1
摘要:
综合岩心观察、薄片鉴定、测井相分析,制定了川中地区中三叠统雷口坡组一段(雷一段)的沉积相划分方案;通过连井剖面对比,对沉积相展布及演化规律进行了系统剖析;基于常规、非常规油气双领域视角,划分了有利储集区带。研究结果表明:①川中地区雷一段主要发育蒸发台地与局限台地,进一步划分为蒸发潮坪、局限潮坪、台内滩3个亚相及膏坪、膏云坪、云坪、灰坪、泥云坪、颗粒滩6个微相。②研究区沉积演化受古构造、古地貌与海平面变化协同控制,具有“早期滩坪发育、晚期蒸发增强”的阶段性沉积演化序列,雷一1亚段沉积期,盆地西高东低、海平面相对较高,发育局限台地云坪与颗粒滩沉积;雷一2亚段沉积期,气候干旱、海平面下降,膏云坪广泛发育,陆源泥质输入增多,沉积体系演化为蒸发岩为主的咸化沉积体系,构成海退序列。③研究区储层特征存在明显分层差异,雷一1亚段以颗粒滩和云坪相控常规储层为主,储集岩性为颗粒白云岩与晶粒白云岩,经准同生期暴露、早期岩溶及白云石化作用叠加改造而形成优质储层;雷一2亚段发育泥质白云岩非常规储层,具有“源-储一体”的成藏优势,顶底板受膏岩层封堵,构成密闭型成藏系统。④磨溪地区为颗粒滩相最有利发育区,川中西部—南部为云坪相有利储集分布区,蓬阳地区为泥云坪相非常规油气“甜点”区。
中图分类号:
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