岩性油气藏 ›› 2025, Vol. 37 ›› Issue (3): 140152.doi: 10.12108/yxyqc.20250313
• 地质勘探 • 上一篇
刘迎宝1,2, 李元昊1,2, 翟文彬1,2, 赵文暄1,2, 李哲3, 杨龙华4, 郭雅倩1,2
LIU Yingbao1,2, LI Yuanhao1,2, ZHAI Wenbin1,2, ZHAO Wenxuan1,2, LI Zhe3, YANG Longhua4, GUO Yaqian1,2
摘要: 综合运用岩心、测井、地震等资料,对鄂尔多斯盆地郝滩地区三叠系长81亚段极缓坡浅水三角洲前缘砂体类型及成因模式进行了研究。结果表明:①郝滩地区长8沉积期具有构造稳定、坡度极缓(仅0.03°)、水体较浅、湖岸线迁移摆动幅度大的特征。长81亚段主要发育水下分流河道、河口坝、席状砂3种砂体类型和叠置水下分流河道、叠置水下分流河道—河口坝、叠置河口坝等主要复合叠置砂体类型。②三角洲内前缘近端主要发育水下分流河道砂体,砂体叠置类型以水下分流河道多期叠加为主,河流作用主导,测井曲线主要为箱形或钟形,单期砂体厚度(砂厚> 10 m)较大,平面上呈条带状展布;三角洲内前缘远端主要发育水下分流河道和河口坝砂体,形成了叠置水下分流河道、叠置水下分流河道—河口坝、叠置河口坝3种主要复合叠置砂体类型,河流与湖浪共同作用,测井曲线以箱形、钟形、漏斗形为主,单期砂体(厚度为5~10 m)较厚,平面上呈朵状展布;三角洲外前缘主要发育席状砂体,湖浪作用主导,垂向上表现为多期孤立指形砂体,单期砂体(厚度< 2 m)较薄,平面上呈连片性较好的席状砂体。
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