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四川盆地下寒武统龙王庙组颗粒滩特征及分布规律

作    者:姚根顺1,2,周进高1,2,邹伟宏1,2,张建勇1,2,潘立银1,2,郝毅1,2,王芳1,谷明峰1,董庸1,郑剑锋1,倪超1,辛勇光1
单    位:1 中国石油杭州地质研究院;2 中国石油天然气集团公司碳酸盐岩储层重点实验室
基金项目:受中国石油勘探与生产分公司勘探前期研究(项目号:2012ZD01-02-03)等资助
摘    要:
四川盆地龙王庙组颗粒滩相沉积具有良好的天然气勘探潜力。利用盆地露头、岩心和薄片资料,结合地震解释,明确了颗粒滩相由砂屑白云岩、鲕粒白云岩、晶粒白云岩和斑状白云岩组成。颗粒滩相发育滩主体、滩翼和滩坪等微相,储层主要分布于滩主体微相。颗粒滩包含多期向上变浅的高频旋回,每期滩体厚度达2~20m,宽0.9~1.5km,多期滩体的叠置可形成累厚18~55m、宽7~8km、延伸长达百余千米的滩带;滩带主要发育在台隆区相对高部位,总体上环绕澙湖展布,受古构造和海平面变化的双重控制。这一认识有利于盆地龙王庙组滩体的预测,并有助于提高钻探成功率。
关键词:四川盆地;下寒武统;龙王庙组;白云岩;沉积相特征;分布规律

Characteristics and Distribution Rule of Lower CambrianLongwangmiao Grain Beach in Sichuan Basin

Author's Name: Yao Genshun, Zhou Jingao, Zou Weihong, Zhang Jianyong, Pan Liyin,Hao Yi, Wang Fang, Gu Mingfeng, Dong Yong, Zheng Jianfeng,Ni Chao, Xin Yongguang
Institution: PetroChina Hangzhou Institute of Geology
Abstract:
The Lower Cambrian Longwangmiao grain beach sediments are of good potential of gas exploration in Sichuan basin. Based on the data from outcrops, cores and thin sections, and combined with the seismic interpretation, it is shown that the grain beach facies is composed of doloarenite, oolitic dolostone, crystalline grain dolostone and porphyritic dolostone in lithology. The grain beach facies includes three microfacies: the beach body, bank wings and beach flats microfacies. The reservoir mainly consists of the bank body microfacies. Grain beach contains multiple frequencies of shallowing-upward cycles. Each frequency of beach body is 2~20m in thickness and 0.9~1.5km in width. Multiphase beach bodies are superimposed to form a 18~55m thick, 7~8km wide and hundreds km long beach belt. The beach belt mainly develops in upheaval areas of the platform and distributes around the lagoon, which is controlled by ancient structures and sea-level changes. This viewpoint is useful to predicting the location of the Longwangmiao grain beachand helpful to improving the success rate of drills.
Keywords: Lower Cambrian; Longwangmiao Formation; Dolostone; Sedimentary Facies characteristics; Distribution Rule; Sichuan Basin
投稿时间:2013-05-16  
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