Enrichment laws of deep tight sandstone gas reservoirs in the Western Sichuan Depression, Sichuan Basin

被引：0
|
作者：
Liu Z. [1 ]
Xu S. [1 ]
Liu J. [1 ]
Ma L. [1 ]
Liu S. [2 ]
Fan X. [1 ]
Jin W. [1 ]
Li W. [1 ]
机构：
[1] Sinopec Exploration & Production Research Institute, Beijing
[2] Chengdu University of Technology, Chengdu, 610059, Sichuan
来源：
Xu, Shilin (xushilin.syky@sinopec.com) | 1600年 / Natural Gas Industry Journal Agency卷 / 40期
关键词：
Deep tight sandstone gas reservoir; Effective development; Enrichment law; Hydrocarbon accumulation model; Reservoir densification; Sichuan Basin; Upper Triassic; Western Sichuan Depression;
D O I：
10.3787/j.issn.1000-0976.2020.02.004
中图分类号：
学科分类号：
摘要：
The deep tight sandstone gas reservoir of Xujiahe Formation of Upper Triassic in the Sichuan Basin is faced with such problems as low ratio of effective wells, low reserve production rate and difficult effective scale development. In order to find out its accumulation process and enrichment laws and confirm the main control factors of high production, this paper carried out a series of studies by taking the gas reservoir of the second Member of Xujiahe Formation (hereinafter referred to as Xu-2 Member) in the Xinchang structural belt of the Sichuan Basin as the research object. Firstly, the time sequence of key hydrocarbon accumulation factors was determined by means of homogenization temperature of fluid inclusion, single-well burial and thermal history reconstruction, paleo-structure restoration and porosity evolution history analysis. And combined with structural evolution analysis, the hydrocarbon accumulation model of Xu-2 Member gas reservoir was established and the enrichment laws of natural gas in this area were analyzed. Then, based on the statistical analysis on the relationship between single-well productivity and the geological parameters (such as fault, fracture and lithofacies), the main factors controlling the high and stable production of gas wells were determined. Finally, measures for exploring and developing this type of deep tight sandstone gas reservoir efficiently were put forward. And the research results were obtained. First, the main hydrocarbon accumulation period of the Xu-2 Member gas reservoir in the Xinchang structural belt is earlier than the key period of its reservoir densification and later than the key formation period of its trap. Second, the Xu-2 Member gas reservoir presents a hydrocarbon accumulation model in the sequence of "hydrocarbon accumulation-reservoir densification-later gas reservoir adjustment" and the enrichment laws of "style setting in the early stage, densification in the middle stage and production controlling in the late stage". Third, the gas production rates of gas wells are mainly controlled by the development degree of structural fractures in the initial stage and by the thickness of favorable lithofacies in the stable production stage. The development degree of high-angle structural fractures is the key factor to control the high production of gas reservoirs. In conclusion, the zones where the structures are always uplifts and those with developed N-S striking faults are the preferred targets of Xinchang structural belt for high gas production. Natural gas in type III reservoirs with under-developed or undeveloped N-S striking structural faults cannot be developed effectively unless single-well productivity is increased by means of reservoir stimulation. © 2020, Natural Gas Industry Journal Agency. All right reserved.
引用
收藏
页码：31 / 40
页数：9
相关论文
共 27 条
  • [1] Li G., Li N., Xie J., Et al., Basic features of large gas play fairways in the Upper Triassic Xujiahe Formation of the Sichuan Foreland Basin and evaluation of favorable exploration zones, Natural Gas Industry, 32, 3, pp. 15-21, (2012)
  • [2] Xi S., Liu X., Meng P., Exploration practices and prospect of Upper Paleozoic giant gas fields in the Ordos Basin, Natural Gas Industry, 35, 8, pp. 1-9, (2015)
  • [3] Wang Y., Lyu C., Yao A., Et al., Tight sandstone gas resource potential and exploration prospect in the Junggar Basin, Natural Gas Geoscience, 26, 5, pp. 855-860, (2015)
  • [4] Wei G., Zhang F., Li J., Et al., New progress of tight sand gas accumulation theory and favorable exploration zones in China, Natural Gas Geoscience, 27, 2, pp. 199-210, (2016)
  • [5] Yang K., Zhu H., Ye J., Et al., The Geological Characteristics of Tight Sandstone Gas Reservoirs in West Sichuan Basin, (2012)
  • [6] Yang K., Pang X., The formation mechanism and prediction of tight sandstone gas reservoirs: A case study from Western Sichuan Depression, (2012)
  • [7] Xie G., Zhu H., Ye S., Et al., The geological characteristics and evaluation methods of tight sandstone gas reservoirs in West Sichuan Basin, (2018)
  • [8] Zhao Z., Li N., Liu M., Et al., Origin of gas accumulation and high yield in tight gas reservoirs of Xujiahe Formation, Sichuan Basin, Natural Gas Exploration and Development, 42, 2, pp. 39-47, (2019)
  • [9] Wei G., Yang W., Liu M., Et al., Distribution rules, main controlling factors and exploration directions of giant gas fields in the Sichuan Basin, Natural Gas Industry, 39, 6, pp. 1-12, (2019)
  • [10] Liu S., Ren X., Yao S., Et al., Relationship between gas reservoir distribution and structural system of Upper Triassic Xujiahe Fm in the Sichuan Basin, Natural Gas Industry, 38, 1, pp. 1-14, (2018)
123