玛湖凹陷二叠系上乌尔禾组扇三角洲沉积特征及控制因素

doi:10.12108/yxyqc.20210106

岩性油气藏 ›› 2021, Vol. 33 ›› Issue (1): 57–70.doi: 10.12108/yxyqc.20210106

玛湖凹陷二叠系上乌尔禾组扇三角洲沉积特征及控制因素

马永平¹, 张献文², 朱卡³, 王国栋¹, 潘树新¹, 黄林军¹, 张寒¹, 关新¹

1. 中国石油勘探开发研究院西北分院, 兰州 730020;
2. 甘肃煤田地质局一四九队, 兰州 730020;
3. 中国石油新疆油田分公司勘探事业部, 新疆克拉玛依 834000

收稿日期:2020-08-19 修回日期:2020-10-25 出版日期:2021-02-01 发布日期:2021-01-25
作者简介:马永平(1983-),男,硕士,工程师,主要从事沉积储层方面的研究工作。地址:(730020)甘肃省兰州市城关区雁儿湾路535号。Email:ma_yp@petrochina.com.cn。
基金资助:
国家自然科学基金项目“陆相湖盆水下滑坡体的形成机制、识别标志及其石油地质意义”（编号：41872116）资助

Sedimentary characteristics and controlling factors of fan-delta of the Upper Urho Formation of Permian in Mahu Sag

MA Yongping¹, ZHANG Xianwen², ZHU Ka³, WANG Guodong¹, PAN Shuxin¹, HUANG Linjun¹, ZHANG Han¹, GUAN Xin¹

1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
2. No. 149 Team, Gansu Provincial Bureau of Coal Geology, Lanzhou 730020, China;
3. Department of Exploration, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China

Received:2020-08-19 Revised:2020-10-25 Online:2021-02-01 Published:2021-01-25

摘要/Abstract

摘要： 近年来，准噶尔盆地玛湖凹陷上二叠统砂砾岩储集体中获得重大油气勘探突破。为研究玛湖凹陷上乌尔禾组扇三角洲沉积特征及控制因素，开展了岩相分析、偏光显微镜鉴定、物性分析及成岩作用研究。结果表明：①上乌尔禾组砂砾岩储层自下而上粒度逐渐变细，砾石含量逐渐减少，为典型湖侵退覆式沉积。②上乌尔禾组发育3类11种岩相类型，不同岩相在成岩作用改造下，岩石结构和储层性质差异明显，以牵引流及密度流形成的岩相具有较高的储层质量。③上乌尔禾组储层质量自下而上依次变好，沉积环境控制储层质量的宏观变化，泥杂基破坏孔隙的连通性，粒度的集中程度及发育范围控制优质储层的规模。溶蚀作用有效改善储层储集能力，平均孔隙度增量为3.2%。该研究成果对玛湖凹陷上乌尔禾组砂砾岩勘探具有借鉴意义。

关键词: 扇三角洲, 砂砾岩, 沉积特征, 上乌尔禾组, 二叠系, 玛湖凹陷

Abstract: In recent years,a great breakthrough has been made in oil and gas exploration of glutenite reservoirs of the Upper Permian in Mahu Sag,Junggar Basin. In order to study the sedimentary characteristics and controlling factors of the fan-delta of the Upper Urho Formation,the analyses of lithofacies,polarizing microscope identification,physical property and diagenesis were carried out. The results show that:(1)The reservoir studied developed in a retrogradation fan-delta complex that is the grain size of glutenite reservoirs of the upper Urho Formation gradually became finer and the gravel content gradually decreased from bottom to top,which is a typical lake transgressive and retrogressive deposit.(2)There are three categories and 11 kinds of lithofacies developed in the Upper Urho Formation. The rock structure and reservoir properties of different lithofacies are obviously different under the transformation of sedimentary and diagenetic processes. The lithofacies formed by traction flow and density flow has higher reservoir quality.(3)The reservoir quality of the Upper Urho Formation gets better from bottom to top. The sedimentary environment controls the macroscopic changes of the reservoir quality,the mud matrix destroys the pore connectivity,and the concentration degree and development range of grain size control the scale of the high-quality reservoir. Dissolution effectively improved the reservoir capacity,with an average porosity increment of 3.2%. The research results are of reference significance for glutenite exploration of Upper Urho formation in Mahu Sag.

Key words: fan-delta, glutenite, sedimentary characteristics, Upper Urho Formation, Permian, Mahu Sag

中图分类号:

TE122.1

马永平, 张献文, 朱卡, 王国栋, 潘树新, 黄林军, 张寒, 关新. 玛湖凹陷二叠系上乌尔禾组扇三角洲沉积特征及控制因素[J]. 岩性油气藏, 2021, 33(1): 57–70.

MA Yongping, ZHANG Xianwen, ZHU Ka, WANG Guodong, PAN Shuxin, HUANG Linjun, ZHANG Han, GUAN Xin. Sedimentary characteristics and controlling factors of fan-delta of the Upper Urho Formation of Permian in Mahu Sag[J]. Lithologic Reservoirs, 2021, 33(1): 57–70.

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玛湖凹陷二叠系上乌尔禾组扇三角洲沉积特征及控制因素

Sedimentary characteristics and controlling factors of fan-delta of the Upper Urho Formation of Permian in Mahu Sag

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