Charging simulation experiment and characteristics of tight sandstone gas reservoirs: A case study of the Upper Triassic Xujiahe Formation sandstone gas reservoir in the central Sichuan Basin

被引：0
|
作者：
Xie Z. [1 ,2 ]
Yang C. [1 ,2 ]
Li J. [1 ,2 ]
Jin H. [1 ,2 ]
Wang X. [3 ]
Hao C. [1 ,2 ]
Zhang L. [1 ,2 ]
Guo J. [1 ,2 ]
Hao A. [1 ,2 ]
机构：
[1] PetroChina Research Institute of Petroleum Exploration & Development, Langfang
[2] CNPC Key Laboratory of Gas Reservoir Formation and Development, Langfang
[3] Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu
来源：
Natural Gas Industry | 2020年 / 40卷 / 11期
关键词：
Central Sichuan Basin; Low gas generation intensity region; Natural gas; NMR; Simulation experiment; Tight sandstone; Upper Triassic Xujiahe Formation;
D O I：
10.3787/j.issn.1000-0976.2020.11.004
中图分类号：
学科分类号：
摘要：
Tight sandstone gas reservoir has small pore throat, complex pore structure and high water saturation with the main controlling factors unknown, which makes it difficult to investigate the large-scale hydrocarbon accumulation mechanism of gas reservoir and predict gas and water distribution. By taking the tight sandstone gas reservoir of Upper Triassic Xujiahe Formation in the central Sichuan Basin as the research object, on-line dynamic simulation was carried out on gas-driving-water process in tight sandstone under different displacement pressures using the simulation experimental equipment based on the organic combination of low-field NMR and high-pressure displacement device. Then, the occurrence and flow characteristics of gas and water in rocks under different pressures were investigated, and the relationships between fluid saturation and charging pressure and pore diameter were characterized quantitatively. Finally, the enrichment mechanisms of tight sandstone gas were discussed. And the following research results were obtained. First, the main reservoir body controlling the gas saturation of Xujiahe Formation gas reservoir is the reservoir space with a pore diameter of 0.1-10.0 μm. Second, on the whole, gas saturation presents an increasing trend with the increase of porosity and permeability. When porosity and permeability are similar, gas saturation is mainly controlled by reservoir space with a pore diameter larger than 1.0 μm. And the larger the proportion of large pore diameter, the higher the gas saturation. Third, the gas saturation of the Xujiahe Formation tight sandstone reaches 70% of the total value under a charging pressure of 3.0-5.5 MPa and then it increases slowly and the total increase is small with the increase of the charging pressure. Fourth, "coupling of small differential pressure drive and reservoir space with relatively large pore diameter" is an important factor for the formation of large- and medium-sized gas fields with high water saturation in the tight sandstone of low gas generation intensity region. In conclusion, due to the characteristics of "small pore diameter, low gas generation intensity and proximal accumulation", the Xujiahe Formation reservoir in the central Sichuan Basin is mainly driven by small pressure difference and has the reservoir space with relatively large pore diameters. Natural gas can be enriched and accumulated into reservoirs on a large scale, but the reservoir has high water saturation. © 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 35 条
  • [1] DAI Jinxing, NI Yunyan, WU Xiaoqi, Tight gas in China and its significance in exploration and exploitation, Petroleum Exploration and Development, 39, 3, pp. 257-264, (2012)
  • [2] JIA Chengzao, ZHENG Min, ZHANG Yongfeng, Unconventional hydrocarbon resources in China and the prospect of exploration and development, Petroleum Exploration and Development, 39, 2, pp. 129-136, (2012)
  • [3] LUO Chao, JIA Ailin, HE Dongbo, Et al., Comparison study on the distribution of gas and water in Xu-4 and Xu-6 Formations tight gas sandstone reservoir of Guang'an Gasfield, Sichuan Basin, Natural Gas Geoscience, 27, 2, pp. 359-370, (2016)
  • [4] HAO Guoli, LIU Guangdi, XIE Zengye, Et al., Distribution characteristics of gas and water of tight sandstone gas reservoir in Upper Triassic Xujiahe Formation of Guang'an Gasfield, Journal of China University of Petroleum (Edition of Natural Science), 34, 3, pp. 1-7, (2010)
  • [5] CHEN Taotao, JIA Ailin, HE Dongbo, Et al., Mechanisms of gas-water distribution in tight sandstone gas reservoirs of Xujiahe Formation, Central Sichuan Basin, Oil & Gas Geology, 35, 2, pp. 218-223, (2014)
  • [6] ZHAO Zhengwang, LI Nan, LIU Min, 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)
  • [7] CHE Guoqiong, WANG Li'en, WANG Hongjing, Et al., Control action of faults on the sweet spots of tight sandstone gas reservoir: A case study of the second member of Xujiahe gas reservoir in the Penglai area, Central Sichuan Basin, Natural Gas Industry, 39, 9, pp. 22-32, (2019)
  • [8] TANG Dahai, WANG Xiaojuan, CHEN Shuangling, Et al., Analysis about the main controlling factors of tight gas accumulation and high output in Xujiahe Formation of Zhongtaishan area, Sichuan Basin, Natural Gas Geoscience, 29, 11, pp. 1575-1584, (2018)
  • [9] LI Jian, WEI Guoqi, XIE Zengye, Et al., Accumulation mechanism and main controlling factors of large tight sandstone gas fields in China: Cases study on Ordos Basin and Sichuan Basin, Acta Petrolei Sinica, 34, S1, pp. 14-28, (2013)
  • [10] LI Yong, CHEN Shijia, LU Jungang, Et al., Main controlling factors of near-source and inter bedded-accumulation tight sandstone gas from coal-bearing strata: A case study from natural gas of Xujiahe Formation, Central Sichuan Basin, Natural Gas Geoscience, 30, 6, pp. 798-808, (2019)
1234