天然气地球科学 ›› 2021, Vol. 32 ›› Issue (2): 191204.doi: 10.11764/j.issn.1672-1926.2020.11.013
Zhuang-zhuang BAI(),Wei YANG(),Wu-ren XIE,Hui JIN,Sai-jun WU,Shi-yu MA,Qing-chao CAO
摘要:
川中地区寒武系洗象池群有较大勘探潜力,台内滩是主要储集体,其发育特征是该区研究重点。通过对露头、钻井、测井和地震等资料的研究,应用自然伽马能谱测井及小波变换等技术与常规方法相结合,开展层序地层划分和台内滩发育特征研究。取得3点新认识:①将洗象池群划分为4个三级层序(SQ1—SQ4),其中层序SQ1、SQ2、SQ3的海侵体系域和高位体系域发育较为完整,层序SQ4剥蚀较为严重;②川中地区洗象池群主要发育局限台地相,可进一步细分为台坪、潟湖和台内滩3个亚相,在层序地层格架内,编制层序岩相古地理图,台内滩主要呈薄层叠置发育于4个三级层序中,其中以层序SQ2、SQ3的高位体系域为主;③相对海平面变化和乐山―龙女寺古隆起,共同控制台内滩发育位置、叠置样式和展布,滩体主要沿古隆起斜坡呈带状分布,不同次级海平面变化速率影响单个滩体厚度。台内滩有利储层主要发育于川中地区的西南、东北和中部,为有利勘探区带。成果对于丰富厚层单一碳酸盐岩层序地层研究和指导川中地区油气勘探有较重要意义。
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