石油与天然气地质 ›› 2025, Vol. 46 ›› Issue (1): 91-107.doi: 10.11743/ogg20250107
收稿日期:2024-08-03
修回日期:2024-12-18
出版日期:2025-02-28
发布日期:2025-03-03
第一作者简介:李宏涛(1977—),男,博士、高级工程师,气藏描述与致密气田开发。E-mail: liht.syky@sinopec.com。
基金项目:Received:2024-08-03
Revised:2024-12-18
Online:2025-02-28
Published:2025-03-03
摘要:
为了弄清鄂尔多斯盆地东胜气田杭锦旗锦77井区下石盒子组1段(简称盒1段)层序沉积特征,通过岩心、测井和地震等资料研究岩石相测井曲线响应和地震反射特征,结合不同结构砂体地球物理正演结果,总结了盒1段沉积微相、测井相和地震相三相综合响应模式,划分了下石盒子组及其上、下地层各级层序界面,研究了内部沉积微相特征;利用地球物理属性地层切片技术,井-震结合、互为约束,确定了H1-2沉积微相平面展布。研究结果表明:①根据下石盒子组高频层序格架及砂体分布,将盒1段划分为4个小层。砂体主要分布在H1-1—H1-3小层,每个小层厚15 ~ 20 m。②综合盒1段岩性、沉积构造、沉积相标志、垂向组合和砂体分布特征,认为主要为低可容纳空间、物源供给充分、河道不固定的游荡性辫状河沉积,心滩、河道充填和泛滥平原是最主要的三种沉积微相。主要目的层H1-2小层发育近南北向条带状展布的辫状河道3 ~ 4条,宽度介于1 ~ 8 km,北部河道是心滩微相发育的有利部位。
中图分类号:
图8
鄂尔多斯盆地北部杭锦旗地区东胜气田锦77井区下石盒子组盒1段岩相特征a.锦77井,深度2 702.5 m, 灰白色砂砾岩,河道滞留沉积; b.锦77井,深度2 678.6 m,灰白色砂砾岩、砂岩,冲刷面构造,界面上为灰白色砂砾岩,石英砾、岩屑砾、泥砾,最大砾径60 mm,底部为深灰色泥岩;c.锦76井,深度2 729.3 m,粗砂岩,冲刷面;d.锦77井,深度2 707.5 m,含砾粗砂岩,槽状交错层理;e.锦77井,深度2 709.4 m,粗砂岩,块状层理;f.锦76井,深度2 726.7 m,灰白色中砂岩,夹灰色泥质条带呈斜层理;g.锦76井,深度2 726.4 m, 中-细砂岩,夹粉砂质泥岩条带,平行层理; h.锦77井,深度2 683.5 m,灰色泥岩,断面含植物化石印痕;i.锦77井, 深度2 710.3 ~ 2 713.0 m,辫状河道非典型二元结构,下部河床沉积厚度远大于上部堤岸、河漫滩; j,k.锦77井,深度2 698.5 ~ 2 704.4 m,辫状河沉积由砂砾岩,含砾粗砂岩和中-细砂岩组成的向上变细的米级旋回特征明显; l. 盒1段河道心滩砂体多期叠置特征,山西保德保德扒楼沟剖面(a—k为岩心照片;l为野外剖面照片,其中黄色虚线为岩层界面。所有岩心直径均为10 cm。)"
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