二连盆地巴音都兰凹陷B51井区白垩系阿四段扇三角洲前缘沉积特征

doi:10.12108/yxyqc.20240408

岩性油气藏 ›› 2024, Vol. 36 ›› Issue (4): 85–97.doi: 10.12108/yxyqc.20240408

二连盆地巴音都兰凹陷B51井区白垩系阿四段扇三角洲前缘沉积特征

周洪锋¹, 吴海红², 杨禹希¹, 向红英¹, 高吉宏², 贺昊文², 赵旭²

1. 中国石油华北油田公司二连分公司, 内蒙古锡林浩特 027200;
2. 智科石油技术有限公司, 河北任丘 062552

收稿日期:2023-05-12 修回日期:2023-05-31 出版日期:2024-07-01 发布日期:2024-07-04
第一作者:周洪锋（1982—），男，硕士，高级工程师，主要从事油气田开发地质方面的研究工作。地址：（027200）内蒙古锡林浩特市团结大街601号。Email：yjy_sz265@163.com。
基金资助:
中国石油重大科技专项“华北油田持续有效稳产勘探开发关键技术研究与应用”（编号：2017E-15）资助。

Sedimentary characteristics of fan delta front of the fourth member of Cretaceous A’ershan Formation in Bayindulan Sag，Erlian Basin

ZHOU Hongfeng¹, WU Haihong², YANG Yuxi¹, XIANG Hongying¹, GAO Jihong², HE Haowen², ZHAO Xu²

1. Erlian Branch, PetroChina Huabei Oilfield Company, Xilinhaote 027200, Inner Mongolia, China;
2. Zhike Petroleum Technology Co., Ltd., Renqiu 062552, Hebei, China

Received:2023-05-12 Revised:2023-05-31 Online:2024-07-01 Published:2024-07-04

摘要/Abstract

摘要： 在岩心观察和粒度分析的基础上，结合录井、测井、地震等资料，对二连盆地巴音都兰凹陷 B51 井区下白垩统阿四段扇三角洲前缘沉积特征、分布规律与发育模式进行了研究。研究结果表明：①巴音都兰凹陷 B51 井区阿四段发育砂砾岩相、砂岩相、粉砂岩相、泥岩相等四大类，可进一步划分为 13 个小类，粒度概率累计曲线表现为悬浮一段式、低斜两段式、高斜两段式、滚动-跳跃-悬浮三段式 4 种类型，具有箱形、钟形、漏斗形、指形、平直形 5 种测井相标志，发育前积、丘状、杂乱状、亚平行状 4 种地震相。②研究区阿四段扇三角洲前缘发育水下分流主河道、水下分流河道、河口坝、水下分流间湾、席状砂和远砂坝 6 种沉积微相，纵向上可分为Ⅰ，Ⅱ，Ⅲ共 3 个砂组，Ⅱ砂组和Ⅲ砂组沉积时期，扇三角洲前缘砂体分布广泛，水下分流主河道和水下分流河道发育；Ⅰ砂组沉积时期，湖盆范围最大，砂体变细、变薄。③研究区阿四段自下而上表现为水进沉积序列，发育退积型扇三角洲前缘，预测 B51-71 井区和 B51-74 井区发育的水下分流主河道和水下分流河道为利储集相带，B51-19 井区发育的河口坝为较有利的储集相带。

关键词: 扇三角洲前缘, 沉积特征, 水进-退积旋回, 粒度概率累计曲线, 测井相标志, 地震相, 水下分流河道, 河口坝, 阿四段, 白垩系, 巴音都兰凹陷, 二连盆地

Abstract: Based on core observation and particle size analysis，combined with mud-logging，wire-logging and seismic data，the sedimentary characteristics，distribution law and development model of fan delta front of the fourth member of Cretaceous A’ershan Formation（K₁a₄）in B51 well area of Bayindulan Sag in Erlian Basin were studied. The results show that：（1）The lithofacies of K₁a₄ in B51 well area can be divided into 13 types in four major categories：conglomerate，sandstone，siltstone and mudstone. The grain size distribution curves can be classified into four types，including one suspension segment pattern，low slope two segment pattern，high slope two segment pattern and one roll segment-one bouncing segment-one suspension segment pattern. The logging curves has the characteristics of box-shaped，bell-shaped，funnel-shaped，finger-shaped and flat-shaped， and there are four types of seismic facies ：foreset，lenticular，moundy and subparallel.（2）There are six types of sedimentary microfacies in the fan delta front，including underwater channel，underwater distributary channel，mouth bar，underwater distributary interchannel，sheet sand and distal bar. The K₁a₄ can be divided into Ⅰ， Ⅱ，Ⅲ sand groups in vertical. During the sedimentary period of Ⅱ and Ⅲ sand groups，the sand bodies of fan delta front were widely distributed，underwater channel and underwater distributary channel were mainly developed. During the sedimentary period of Ⅰ sand groups，lacustrine basin occupied the largest area，sand bodies became finer and thinner.（3）The K₁a₄ in the study area shows water intrusion depositional sequence from bottom to top，with the development of a retrogradational fan delta front. It is predicted that the underwater channel and underwater distributary channel developed in B51-71 and B51-74 well areas are favorable reservoir facies zones，while mouth bar developed in B51-19 well area is a more favorable reservoir facies zone.

Key words: fan delta front, sedimentary characteristics, transgressive-regressive cycle, grain size cumulative probability curve, logging facies markers, seismic facies, underwater distributary channel, mouth bar, the fourth member of A’ershan Formation, Cretaceous, Bayindulan Sag, Erlian Basin

中图分类号:

TE121.3

周洪锋, 吴海红, 杨禹希, 向红英, 高吉宏, 贺昊文, 赵旭. 二连盆地巴音都兰凹陷B51井区白垩系阿四段扇三角洲前缘沉积特征[J]. 岩性油气藏, 2024, 36(4): 85–97.

ZHOU Hongfeng, WU Haihong, YANG Yuxi, XIANG Hongying, GAO Jihong, HE Haowen, ZHAO Xu. Sedimentary characteristics of fan delta front of the fourth member of Cretaceous A’ershan Formation in Bayindulan Sag，Erlian Basin[J]. Lithologic Reservoirs, 2024, 36(4): 85–97.

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二连盆地巴音都兰凹陷B51井区白垩系阿四段扇三角洲前缘沉积特征

Sedimentary characteristics of fan delta front of the fourth member of Cretaceous A’ershan Formation in Bayindulan Sag，Erlian Basin

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