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川东地区龙王庙组颗粒滩发育特征及分布规律

发布时间:2018-05-10 13:00

  本文选题:川东地区 + 龙王庙组 ; 参考:《地质科技情报》2017年06期


【摘要】:以川东地区龙王庙组颗粒滩为研究对象,在综合野外剖面、钻井、测录井、岩心和薄片等资料的基础上,对区内龙王庙组颗粒滩特征、分布规律和主控因素进行了研究。研究区颗粒滩岩石类型包括颗粒白云岩和颗粒灰岩,颗粒类型以砂屑为主,其次为鲕粒和砾屑。颗粒滩主要发育泻湖-颗粒滩、泻湖-颗粒滩-台坪、滩间海-颗粒滩3种向上变浅、粒度变粗的沉积序列。单个沉积序列中的颗粒滩厚度一般小于2m,纵向上具有良好的继承性,表现为多个单旋回薄单体的叠置;横向上,颗粒滩规模小,连续性较差,具有滩核向滩缘快速尖灭的特征;平面上,颗粒滩主要分布在古地貌高地核部和翼部,总体上呈点状沿北东向展布,平面连续性差。颗粒滩分布的主控因素为海平面升降变化和古地貌,海平面升降变化控制了颗粒滩的发育特征和叠置样式,古地貌决定了颗粒滩的横向连续性和平面分布特征。对比研究表明,围绕泻湖等台内较大型洼地周围发育的古地貌高地为川东地区龙王庙组颗粒滩相储层发育有利区,纵向上主要分布于龙王庙组下段的上部与上段的中上部。
[Abstract]:Based on the data of field profile, drilling, logging, core and thin slice, the characteristics, distribution and main controlling factors of granular beach of Longwangmiao formation in East Sichuan are studied. The rock types of granular beach in the study area include granular dolomite and granular limestone. The grain types are mainly sand debris followed by oolitic grain and gravel. There are three types of sedimentary sequences: lagoon-granular beach, lagoon-granular beach-platform flat, inter-beach sea-granular beach, which are shallower up and coarser in grain size. The thickness of granular beach in a single sedimentary sequence is generally less than 2 m, and it has good inheritance in longitudinal direction, which is characterized by superposition of several single cycle thin monomers, small scale and poor continuity of grain beach in transverse direction, which is characterized by rapid pinching of the beach core to the edge of the beach. On the plane, the granular beach is mainly distributed in the core and wing of paleogeomorphic highland. The main controlling factors of granular beach distribution are sea-level fluctuation and paleogeomorphology, which control the development and superposition pattern of granular beach. Paleogeomorphology determines the horizontal continuity and plane distribution of granular beach. The comparative study shows that the paleogeomorphic highlands developed around the relatively large depressions in the lagoon are favorable areas for the development of granular beach facies reservoirs in Longwangmiao formation in eastern Sichuan, and are mainly distributed in the upper and middle parts of the lower and upper sections of the Longwangmiao formation vertically.
【作者单位】: 中国石油化工股份有限公司勘探分公司研究院;西南石油大学地球科学与技术学院;
【基金】:中国石化科技部项目“四川盆地下组合油气富集规律与目标评价”(P16083)
【分类号】:P618.13

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