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四川盆地下寒武统沧浪铺组白云岩分布新认识及其油气地质意义
A new understanding of dolomite distribution in the Lower Cambrian Canglangpu Formation of Sichuan Basin: Implication for petroleum geology
王文之 范 毅 赖 强 周 刚 聂 晶 邓思思
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作者单位:中国石油西南油气田公司勘探开发研究院
中文关键字:四川盆地 早寒武世 台内裂陷 生烃中心 沧浪铺组 白云岩 岩溶 储层
英文关键字:Sichuan Basin; Early Cambrian; Intracratonic rift; Hydrocarbon-generating center; Canglangpu Formation; Dolomite; Dissolution; Reservoir
中文摘要: 四川盆地在川中、蜀南地区下寒武统沧浪铺组均钻遇过白云岩,但盆地内其他地区尚未见钻遇白云岩的公开报道。
2018 年初,中国石油在达州—开江地区部署的风险探井五探1 井首次在川东地区下寒武统沧浪铺组钻遇厚层块状白云岩。基于此,
通过野外地质调查、钻井及地震资料的综合分析,对沧浪铺组地层、岩性的展布特征及控制因素进行了分析。认为:①在沧浪铺期,
德阳—安岳台内裂陷仍未填平,该裂陷对沧浪铺组地层及岩性具有重要的控制作用;②白云岩主要分布在古隆起区或古隆起围斜区
的高部位,裂陷区内不发育;③在川中磨溪—川西九龙山地区,发育沧浪铺组颗粒白云岩与加里东古侵蚀面的叠合区,颗粒白云岩
遭受顺层溶蚀改造,有利于形成沧浪铺组层控型白云岩储层;④沧浪铺组白云岩储层紧邻下伏筇竹寺组烃源岩,上覆良好的盖层,
具备形成良好成藏组合的条件,可作为四川盆地海相碳酸盐岩天然气勘探的新领域。
DOI: 10.12055/gaskk.issn.1673-3177.2018.01.001



英文摘要:Previous drilling shows there are dolomites developed in the Lower Cambrian Canglangpu Formation, central and southern
Sichuan Basin, whereas no public report on dolomites drilled in other areas. At the beginning of 2018, when drilling the Canglangpu
Formation in Wutan 1 well, a risk exploration one deployed by PetroChina in Dazhou-Kaijiang area, many thick and massive dolomites
were found, belonging to the first discovery in eastern Sichuan Basin. So, in this study, based on some field survey, and drilling
and seismic data, we carried out a systematic analysis on the Canglangpu Formation, and its dolomite distribution and controlling
factors. Results show that (1) the Deyang-Anyue intracratonic rift insufficiently filled during the Canglangpuian affected importantly
both stratigraphy and lithology; (2) dolomites were dominantly distributed at the paleouplift or its higher slope whereas less developed
within the rift; (3) there was an overlapping area of both the Canglangpu grain dolomites and the Caledonian ancient corroded surfaces
developed in Moxi-Jiulongshan areas of central to western Sichuan Basin, and these dolomites were dissolved along beds available for
forming Canglangpu dolomite reservoirs; and (4) adjoining the underlying Qiongzhusi Formation of source rock, the overlying is better
caprock, all to constitute a better source-reservoir-caprock assemblage as a new natural-gas exploration domain of marine carbonate
rocks in Sichuan Basin.
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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:
主管单位:中国石油西南油气田公司  主办单位:中国石油西南油气田公司勘探开发研究院
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