石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (5): 1141-1158.doi: 10.11743/ogg20230506

• 油气地质 • 上一篇    下一篇

塔里木盆地库车坳陷中秋1井区白垩系巴什基奇克组砂质辫状河有利岩相组合发育模式与意义

高志勇1(), 吴永平2, 刘兆龙1, 魏聪2, 张永忠1, 王翠丽2, 刘群明1   

  1. 1.中国石油 勘探开发研究院,北京 100083
    2.中国石油 塔里木油田分公司 勘探开发研究院,新疆 库尔勒 734000
  • 收稿日期:2023-02-15 修回日期:2023-05-10 出版日期:2023-10-19 发布日期:2023-10-19
  • 第一作者简介:高志勇(1974—),男,高级工程师,油气储层地质学。E?mail: gzybox@163.com
  • 基金项目:
    中国石油股份公司项目(2022KT0704)

Development model and significance of favorable lithofacies association of sandy braided river facies of the Cretaceous Bashijiqike Formation in Zhongqiu 1 well block, Kuqa Depression, Tarim Basin

Zhiyong GAO1(), Yongping WU2, Zhaolong LIU1, Cong WEI2, Yongzhong ZHANG1, Cuili WANG2, Qunming LIU1   

  1. 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China
    2.Exploration and Development Research Institute of Tarim Oilfield Company,PetroChina,Korla,Xinjiang 734000,China
  • Received:2023-02-15 Revised:2023-05-10 Online:2023-10-19 Published:2023-10-19

摘要:

塔里木盆地库车坳陷中秋1井深层白垩系巴什基奇克组天然气虽获得高产,但由于钻井数量少、埋藏深度大、储层非均质性强,致使该区有利储层评价及对不同井产能差异控制作用分析存在较大困难。通过开展岩心沉积相分析与相标志识别,基于洪泛面等时性特征,建立了巴什基奇克组等时地层格架,内部3个沉积单元由下至上发育辫状河三角洲前缘—平原—冲积平原辫状河的进积(湖平面下降)演化过程。中秋1井区产能差异层段主要处于最大洪泛面之上巴什基奇克组二段上部—巴什基奇克组一段的冲积平原砂质辫状河沉积环境,不同时期主河道发育位置不同。综合沉积微相、碎屑颗粒粗细结构、孔隙类型与特征、孔隙度与渗透率大小及裂缝发育与否等,将巴什基奇克组砂质辫状河沉积体划分为9种岩相组合类型,沉积微相差异是形成不同岩相组合的基础,其中Ⅰ—Ⅴ类为有利岩相组合。建立了中秋1井区巴什基奇克组砂质辫状河有利岩相组合发育模式,有利岩相组合所占比例在该区具有东高西低特征,控制了含气性的差异。预测沿东部中秋101井—中秋1井—中秋104井,向西部中秋102井—中秋2井一线的南、北区域为有效规模储层发育区,尤以北侧和东北侧更好。

关键词: 砂质辫状河, 产能差异, 岩相组合, 深层, 巴什基奇克组, 白垩系, 中秋1井区, 库车坳陷

Abstract:

The deep Cretaceous Bashijiqike Formation in well Zhongqiu 1 in the Kuqa Depression tested high flow rate of natural gas. However, due to the small number of wells, large burial depth, and strong reservoir heterogeneity, it is difficult to evaluate the favorable reservoirs in the area and analyze the control factors of differential well productivity. Based on the isochronous characteristics of flood surface, we establish an isochronous stratigraphic framework of Bashijiqike Formation through the analysis of core sedimentary facies and identification of facies markers. The evolution process of progradation (lake level descending) of braided river delta front, plain, and alluvial plain braided river is established from bottom to top in the three internal sedimentary units. In Zhongqiu 1 well block, the reservoir intervals showing productivity difference occur in the upper Ba 2 Member and Ba 1 Member which are mainly deposited in the sandy braided rivers on alluvial plain above the maximum flooding surface, and the main river channel has been in different positions in different periods during their deposition. Taking into account factors such as sedimentary microfacies, coarse and fine structure of detrital particles, pore types and characteristics, porosity and permeability data, and fracture intensity, the sandy braided river sedimentary bodies of the Bashijiqike Formation can be divided into nine types in terms of lithofacies combination, with the differences in sedimentary microfacies serving as the basis, and types I—V being favorable lithofacies combinations. A favorable lithofacies combination development model is built for the sandy braided river facies of the Bashijiqike Formation in the Zhongqiu 1 well block. The proportion of favorable lithofacies combinations in this area featuring high in the east and low in the west, serves to determine the differences in gas bearing properties. It is predicted that the SN-trending area between the eastern line across wells Zhongqiu 101, Zhongqiu 1, and Zhongqiu 104 and the western line across wells Zhongqiu 102 and Zhongqiu 2, is favorable for the development of large-scale effective reservoir, especially on the north and northeast sides.

Key words: sandy braided river, productivity difference, lithofacies combination, deep sequence, Bashijiqike Formation, Cretaceous, Zhongqiu 1 well block, Kuqa Depression

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