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川中地区洗象池组有利沉积相带分布预测
Distribution prediction on favorable sedimentary-facies belts of Xixiangchi Formation, central Sichuan Basin
刘 鑫1 曾乙洋1 文 龙1 林 怡1 陈友莲1 陈 文1 吴煜宇1 石书缘2
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DOI:
作者单位:1. 中国石油西南油气田公司勘探开发研究院 2. 中国石油勘探开发研究院
中文关键字:四川盆地 川中地区 古隆起 上斜坡 早寒武世 洗象池组 台内滩 坡折带
英文关键字:Sichuan Basin; Central Sichuan Basin; Paleo-uplift; Upper slope; Early Cambrian; Xixiangchi Formation; Intra-platform beach; Slope break belt
中文摘要:近年来,四川盆地川中地区下寒武统龙王庙组油气勘探取得了重大突破,中上寒武统洗象池组也获得了工业气井和
见到了良好的钻井显示。但是对洗象池组油气地质条件和油气富集规律的认识程度较低,尤其有利沉积相带的分布规律有待进一
步明晰。通过岩心观察和微观特征研究,确定了川中地区洗象池组的沉积相标志,结合测井相分析,对多口典型井进行了沉积相
划分与对比。结果表明:①徐庄—凤山期为局限海台地环境,具备台内滩、局限台坪和滩间海3 种沉积相类型;②颗粒滩具有厚
度总体较薄、多期叠置的特征,纵向上主要发育在洗象池组洗二段和洗三段,横向上,在现今乐山—龙女寺古隆起背景下,上斜
坡带较古隆起顶部更发育,表现为发育期次多、厚度大;③利用井—震结合分析,发现中—上寒武统由斜坡向古隆起方向具有明
显上超现象,广探2 井区在中晚寒武世处于坡折带,有利于滩体发育。结论认为:乐山—龙女寺古隆起控制了坡折带的分布,进
而控制了颗粒滩的分布位于坡折带的上斜坡为颗粒滩最有利发育区。

DOI: 10.12055/gaskk.issn.1673-3177.2018.02.003


英文摘要:Recently, the Lower Cambrian Longwangmiao Formation in central Sichuan Basin has made great breakthrough. Moreover,
industrial gas flow and better drilling shows have been obtained from the Middle to Upper Cambrian Xixiangchi Formation. However,
for Xixiangchi Formation, its geological conditions and hydrocarbon accumulation laws are less understood, especially the distribution
laws of favorable sedimentary-facies belts should be further made clear. In this study, the sedimentary-facies indicators of Xixiangchi
Formation, central Sichuan Basin, were determined by means of core observation and microscopic investigation. And facies classification
and comparison were conducted on multiple typical wells on the basis of electrofacies analysis. Results show that (1) from
Xuzhuangian to Fengshangian, it was in a sedimentary environment of restricted marine platform, and there are three sedimentary-facies
types, including intra-platform beach, restricted platform flat, and inter-beach sea; (2) grain beaches are characterized by smaller
thickness and multiphase superimposition. Vertically, they are mainly developed in Xixiangchi 2 and 3 members. Laterally, the upper
slope is more developed than the top of paleo-uplift, presenting the characteristics of multiple development stages and large thickness
under the current Leshan-Longnvsi paleo-uplift; and (3) an integrated well-seismic analysis illustrates that Middle to Upper Cambrian
onlap is obvious from the slope to the paleo-uplift, and GT2 well area located at the slope break belt during middle to late Cambrian
is favorable for the development of beach bodies. In conclusion, the Leshan-Longnvsi paleo-uplift controls the distribution of slope
break belt, and even the grain beaches; and the upper slope situated in the slope break belt is the most favorable for the development
of grain beaches.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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