岩性油气藏 ›› 2022, Vol. 34 ›› Issue (2): 116130.doi: 10.12108/yxyqc.20220211
李阳1,2, 王兴志1,2, 蒲柏宇3, 徐昌海3, 杨西燕1,2, 朱逸青4, 黄梓桑1,2, 康家豪1,2
LI Yang1,2, WANG Xingzhi1,2, PU Baiyu3, XU Changhai3, YANG Xiyan1,2, ZHU Yiqing4, HUANG Zisang1,2, KANG Jiahao1,2
摘要: 为了厘清四川盆地开江—梁平海槽东侧三叠系飞仙关组层序地层格架下鲕滩的时空分布特征,明确海平面变化对鲕滩迁移的控制机理,开展了岩性特征分析、沉积构造标志识别、层序界面层序地层格架划分等。结果表明:①开江—梁平海槽东侧飞仙关组在持续海退背景下发育2个三级层序(SQ1和SQ2),可进一步细分出5个四级层序(Ⅰ—Ⅴ)。②研究区飞仙关组鲕滩主要分布于Ⅰ—Ⅳ层序,Ⅱ层序内的鲕滩最为发育,单体厚度大、连续性好,而Ⅲ,Ⅰ和Ⅳ层序内的滩体发育程度依次减弱,最差呈不连续的零星状分布。③鲕滩在垂向加积的同时也具有明显的侧向迁移特征,整体由台地内部向斜坡方向迁移,其中Ⅰ层序至Ⅱ层序鲕滩侧向迁移特征最明显。④局部地貌高地发生的高频旋回与碳酸盐岩生产速率协同变化,导致研究区飞仙关组鲕滩呈现垂向加积和多期次叠置现象,而海平面下降到基准面以下时,适合滩体生长的水动力条件由局部高地向局部洼地变迁,使得鲕滩由垂向生长演化为侧向进积。⑤平面上,研究区飞仙关组鲕滩主要沿北西—南东(即台地边缘一带)方向展布,以铁山坡、普光地区最为发育,其次为渡口河、七里北以及罗家寨等地。该研究成果可为开江—梁平海槽地区飞仙关组优质滩相储层勘探提供依据。
中图分类号:
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