岩性油气藏 ›› 2021, Vol. 33 ›› Issue (4): 2028.doi: 10.12108/yxyqc.20210403
张本健1, 田云英1, 曾琪1, 尹宏1, 丁熊2
ZHANG Benjian1, TIAN Yunying1, ZENG Qi1, YIN Hong1, DING Xiong2
摘要: 近年来,四川盆地西北部三叠系须三段的天然气勘探持续获得新发现。为了系统研究四川盆地西北部三叠系须三段砂砾岩的沉积特征,开展了钻井岩心观察、测井解释、相标志鉴定和砂砾岩优势相分析。结果表明:①研究区须三段冲积扇扇中辫状河道、扇缘漫流沉积和扇三角洲平原辫状分流河道、扇三角洲前缘水下分流河道、河口坝和远砂坝等均发育砂砾岩沉积,其中辫状河道主要发育块状砾岩,砾多砂少,漫流沉积砂多砾少、发育板状交错层理和平行层理,具有向上变细的正粒序特征。②扇三角洲以砂岩沉积为主,辫状分流河道、水下分流河道、河口坝和远砂坝发育冲刷面、板状交错层理、平行层理和沙纹交错层理等为主,辫状分流河道、水下分流河道具有向上变细的正粒序特征,河口坝和远砂坝具有向上变粗的反粒序特征。③辫状河道、漫流沉积、辫状分流河道砂砾岩较发育,水下分流河道、河口坝和远砂坝砂砾岩次之。该研究成果对四川盆地西北部三叠系须三段的天然气勘探具有借鉴意义。
中图分类号:
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