鄂尔多斯盆地安塞油田塞160井区三叠系长611储层构型表征

doi:10.12108/yxyqc.20230404

岩性油气藏 ›› 2023, Vol. 35 ›› Issue (4): 37–49.doi: 10.12108/yxyqc.20230404

鄂尔多斯盆地安塞油田塞160井区三叠系长6₁¹储层构型表征

尹艳树¹, 丁文刚¹, 安小平², 徐振华¹

1. 长江大学地球科学学院, 武汉 430100;
2. 中国石油长庆油田公司勘探开发研究院, 西安 710018

收稿日期:2022-11-10 修回日期:2022-12-15 出版日期:2023-07-01 发布日期:2023-07-01
第一作者:尹艳树(1978-),男,博士,教授,主要从事开发地质及储层表征建模方面的教学和研究工作。地址:(430100) 湖北省武汉市蔡甸区大学路111号。Email:yys@yangtzeu.edu.cn。
通信作者: 丁文刚(1996-),男,长江大学在读硕士研究生,研究方向为开发地质。Email:16622515232@163.com。
基金资助:
国家自然科学基金项目“多点地质统计学相控地震同时反演方法”（编号：41872138）资助。

Configuration characterization of Triassic Chang 6₁¹reservoir in Sai 160 well area of Ansai oilfield，Ordos Basin

YIN Yanshu¹, DING Wengang¹, AN Xiaoping², XU Zhenhua¹

1. School of Geosciences, Yangtze University, Wuhan 430100, China;
2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China

Received:2022-11-10 Revised:2022-12-15 Online:2023-07-01 Published:2023-07-01

摘要/Abstract

摘要： 鄂尔多斯盆地安塞油田塞160井区为浅水三角洲沉积，砂体以河道沉积为主，具有连片分布特征，但在开发过程中注采对应性差，连片砂体内部构型及叠置样式复杂。以现代沉积、数值模拟为基础，结合岩心、测井及动态资料，对安塞油田塞160井区长6₁¹小层沉积相及砂体开展精细解剖，明确了其内部砂体构型特征，并划分了砂体演化期次。研究结果表明： ①塞160井区为典型曲流河浅水三角洲沉积，发育水下分流河道、河口坝、席状砂、支流间湾4种沉积微相。②研究区平面上浅水三角洲发育典型的指状河口坝砂体，河道多数分布在河口坝中间，形成“河在中间、坝在两边”的平面分布样式。③垂直物源方向上，分流河道多深切但未切穿河口坝，形成了“河在坝上走”的河-坝组合样式；顺物源方向上，单一河口坝砂体前积形成了复合河口坝砂体。④不同河口坝之间发育泥质或物性隔夹层，导致连片砂体不完全连通；单一河口坝砂体长度为280～1 400 m，宽度为200～420 m；同期河口坝规模（长宽比）及前积倾角相似，不同期次河口坝表现为顺物源长度及前积倾角减小，宽度无明显变化。

关键词: 浅水三角洲, 指状河口坝, 储层构型, 延长组, 三叠系, 安塞油田, 鄂尔多斯盆地

Abstract: Sai 160 well area in Ansai oilfield，Ordos Basin，is a shallow water delta deposit，the sand bodies are dominated by channel deposition，with the characteristics of contiguous distribution. However，the injection and production have poor correspondence in the development process，which indicates that the internal configuration and overlapping style of the contiguous sand bodies are complex. Based on modern sedimentation and numerical simulation，combined with core，well logging and dynamic data，the sedimentary facies and sand bodies of Chang 6₁¹ reservoir in Sai 160 well area of Ansai oilfield were analyzed，its internal sand body configuration characteristics were defined，and the sand body evolution stages were divided. The results show that：（1）Sai 160 well area is a typical shallow delta sedimentary facies of meandering river，which develops four sedimentary microfacies： underwater distributary channel，mouth bar，sheet sand and intertributary bay.（2）Typical bar finger sand bodies are developed in shallow water deltas on the plane in the study area，and most channels are distributed in the middle of mouth bars，forming a plane distribution pattern of river in the middle and mouth bars on both sides.（3）In the cross provenance direction， distributary channels are more deep but do not cut through the mouth bar， forming a riverbar combination style of “river walking on the bar”. Along the provenance direction，a single mouth bar sand body is deposited forward to form a complex mouth bar sand body.（4）Argillaceous or physical interlayers are developed between different mouth bars，resulting in incomplete connectivity of contiguous sand bodies. The length and width of a single mouth bar are 280-1 400 m and 200-420 m，respectively. The size（ratio of length to width）and forward deposit dip angle of the mouth bar are similar in the same stage，while the along source length and forward deposit dip angle of the mouth bar decrease in different periods， but the width has no obvious change.

Key words: shallow water delta, bar finger, reservoir configuration, Yanchang Formation, Triassic, Ansai oilfield, Ordos Basin

中图分类号:

TE122.3

尹艳树, 丁文刚, 安小平, 徐振华. 鄂尔多斯盆地安塞油田塞160井区三叠系长6₁¹储层构型表征[J]. 岩性油气藏, 2023, 35(4): 37–49.

YIN Yanshu, DING Wengang, AN Xiaoping, XU Zhenhua. Configuration characterization of Triassic Chang 6₁¹reservoir in Sai 160 well area of Ansai oilfield，Ordos Basin[J]. Lithologic Reservoirs, 2023, 35(4): 37–49.

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鄂尔多斯盆地安塞油田塞160井区三叠系长6₁¹储层构型表征

Configuration characterization of Triassic Chang 6₁¹reservoir in Sai 160 well area of Ansai oilfield，Ordos Basin

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