西南石油大学学报(自然科学版) ›› 2021, Vol. 43 ›› Issue (2): 10-22.DOI: 10.11885/j.issn.1674-5086.2019.08.28.02

• 地质勘探 • 上一篇    下一篇

北羌塘拗陷巴贡组致密砂岩储层特征及控制因素

程乐利1, 白林坤2, 韦少校2, 熊亭2,3, 印森林1   

  1. 1. 长江大学录井技术与工程研究院, 湖北 荆州 434023;
    2. 中法渤海地质服务有限公司深圳分公司, 广东 深圳 518000;
    3. 长江大学地球科学学院, 湖北 武汉 430100
  • 收稿日期:2019-08-28 出版日期:2021-04-10 发布日期:2021-04-23
  • 通讯作者: 白林坤,E-mail:bailk@cfbgc.com
  • 作者简介:程乐利,1987年生,男,汉族,湖北红安人,讲师,博士,主要从事储层地质和录井地质方面的研究工作。E-mail:chengleli@yangtzeu.edu.cn
    白林坤,1978年生,男,汉族,山东济宁人,工程师,主要从事录井地质和储层地质方面的研究工作。E-mail:bailk@cfbgc.com
    韦少校,1984年生,男,汉族,广西贵港人,助理工程师,主要从事地质录井方面的研究工作。E-mail:weisx@cfbgc.com
    熊亭,1989年生,男,汉族,湖北潜江人,博士研究生,主要从事石油地质与地质录井方面的研究工作。E-mail:xiongting@cfbgc.com
    印森林,1983年生,男,汉族,湖北仙桃人,副教授,博士,主要从事油气田开发地质与录井地质方面的研究工作。E-mail:yinxiang_love@qq.com
  • 基金资助:
    国家科技重大专项(2017ZX05008-006);中国地质调查局项目(121201010000161110,DD21160159);国家青年科学基金(41702119)

Characteristics and Controlling Factors of Tight Sandstone Reservoirs in Bagung Formation in North Qiangtang Depression

CHENG Leli1, BAI Linkun2, WEI Shaoxiao2, XIONG Ting2,3, YIN Senlin1   

  1. 1. Institute of Mud Logging Technology and Engineering, Yangtze University, Jingzhou, Hubei 434023, China;
    2. Shenzhen Branch, China-Franch Bohai Geological Service Co. Ltd., Shenzhen, Guangdong 518000, China;
    3. School of Geosciences, Yangtze University, Wuhan, Hubei 430100, China
  • Received:2019-08-28 Online:2021-04-10 Published:2021-04-23

摘要: 北羌塘拗陷的上三叠统巴贡组碎屑岩是羌塘盆地的储层重点层系,分析沉积、成岩作用对巴贡组碎屑岩储层物性的影响机制,可以为下步勘探工作提供地质依据。研究表明,巴贡组砂岩总体的成分成熟度和结构成熟度中等偏低,溶蚀孔隙是主要的孔隙类型,孔隙结构表现为分选差、喉道细和连通差。沉积因素是控制优质储层的主要因素,形成于分流河道微相的砂层在形成时的水动力强、搬运远,其厚度更大、原生孔隙更为发育,由于抗压实能力强、保留有更多粒间孔隙,因此,后期酸性溶蚀更为发育。绿泥石衬里抑制了粒间硅质胶结物的形成,裂缝发育改善了储层物性,煤系特有的酸性介质环境亦促进了次生孔隙的形成。

关键词: 北羌塘拗陷, 巴贡组, 致密砂岩, 储层特征, 控制因素

Abstract: The Upper Triassic Bagung Formation clastic rocks in the North Qiangtang Depression are the key strata of reservoirs in the Qiangtang Basin. The study shows that the overall compositional maturity and structural maturity of the sandstone in the Bagung Formation are medium and low, the dissolution pores are the main reservoir space, and the pore structure is characteristic of small pore throat radius, poor sorting and poor connectivity. Dissolved pore space is the main pore type, and the pore structure shows poor sorting, fine roaring channel and poor connectivity. Sedimentary factors are the main factors controlling the quality of the reservoir. The sands formed in the microphase of the diversion channel are formed with strong hydrodynamic force and transported far away, and their thickness is larger and the primary pores are more developed, and the acidic dissolution is more developed in the later stage because of the strong compaction resistance and more intergranular pores are retained. The chlorite lining inhibits the formation of intergranular siliceous cement, the fracture development improves the reservoir properties, and the unique acidic medium environment of the coal system also promotes the formation of secondary pores.

Key words: North Qiangtang Depression, Bagung Formation, tight sandstone, reservoir characteristic, controlling factor

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