岩性油气藏 ›› 2022, Vol. 34 ›› Issue (6): 1931.doi: 10.12108/yxyqc.20220602
王亮1, 苏树特1, 马梓柯2, 蒲静2, 姚蔺芳1, 刘宇1, 罗洋1
WANG Liang1, SU Shute1, MA Zike2, PU Jing2, YAO Linfang1, LIU Yu1, LUO Yang1
摘要: 基于区域构造特征、野外露头、钻井、测井等资料,对川中地区寒武系沧浪铺组沉积特征进行了研究,重建了古沉积环境,明确了各沉积相的横向展布特征并预测了有利储层发育区。研究结果表明:①川中地区德阳—安岳裂陷槽内发育深水陆棚相,以碎屑岩沉积为主;裂陷槽以东高磨—龙女寺—北斜坡地区为浅水陆棚相,可细分为3种亚相,碳酸盐浅水陆棚亚相以细晶或颗粒灰岩、细晶或颗粒白云岩为主,见古杯、腕足类等生物,自然伽马和电阻率曲线均呈箱形;碎屑浅水陆棚亚相以粉砂岩或粉砂质泥岩为主,自然伽马和电阻率曲线均呈钟形或漏斗形;混积浅水陆棚亚相表现为砂质白云岩、砂质灰岩和泥岩互层,自然伽马和电阻率曲线均呈齿状。②研究区整体上为西高东低的沉积古地貌格局,由西向东水体逐渐加深,地层厚度逐渐增大;高磨—龙女寺—北斜坡地区沧一下亚段主要为混积浅水陆棚,沧一上亚段主要为碳酸盐浅水陆棚;沧二段主要为碎屑浅水陆棚相。③研究区沉积相的展布控制着优质储层的发育,沧一上亚段碳酸盐浅水陆棚中,颗粒滩白云岩储层最为有利、灰岩储层次之;平面上优质储层主要沿德阳—安岳裂陷槽边缘的构造高部位发育,呈条带状展布。
中图分类号:
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