Discovery of Well Bozi 9 and ultra-deep natural gas exploration potential in the Kelasu tectonic zone of the Tarim Basin

被引：0
|
作者：
Tian J. [1 ]
Yang H. [1 ,2 ]
Wu C. [1 ,2 ]
Mo T. [1 ,2 ]
Zhu W. [1 ,2 ]
Shi L. [1 ,2 ]
机构：
[1] PetroChina Tarim Oilfield Company, Korla, 841000, Xinjiang
[2] Exploration and Development Research Institute, PetroChina Tarim Oilfield Company, Korla, 841000, Xinjiang
来源：
Natural Gas Industry | 2020年 / 40卷 / 01期
关键词：
Bozi-Dabei Block; Early Cretaceous; Exploration discovery; Kelasu tectonic zone; Natural gas accumulation; Reservoir; Tarim Basin; Trap; Ultra-deep layer;
D O I：
10.3787/j.issn.1000-0976.2020.01.002
中图分类号：
学科分类号：
摘要：
The Bozi-Dabei Block in the west of the Kelasu tectonic zone in the Tarim Basin is a complex tectonic zone which is characterized by ultra depth, high temperature, ultra high pressure, violent structural deformation and low oil and gas exploration degree. In Well Bozi 9 which is a wildcat well drilled in the Bozi-Dabei Block, a breakthrough has been made recently with a high-yield industrial oil and gas flow produced during a fracturing test. In order to speed up the oil and gas exploration in this block, this paper analyzed the controlling effect of fault grading combination and paleo-structure on structural deformation in the Kelasu tectonic zone. Then, provenance, stress field and hydrocarbon accumulation characteristics of Bashijiqike Formation and Baxigai Formation of Lower Cretaceous were investigated. Finally, the natural gas exploration potential was evaluated. And the following research results were obtained. First, there are four first-order faults in the Kelasu tectonic zone, including Bozi-Kela, Kelasu, Keshen and Baicheng, which form and control four fault tectonic belts. Second, in the west of this tectonic zone develop two paleo-structures (Bozi and Dabei), which began in the Early Cretaceous and five structural models are formed. Third, two sets of sandstone reservoirs of Bashijiqike Formation and Baxigai Formation are developed in the Kelasu tectonic zone. The former is an ultra-deep (7 500 m) quality reservoir, which is under the control of coarse lithology, weak compaction and low stress. The latter is mainly located in the second member and classified as a fractured-porous reservoir of braided river delta front. Fourth, the crude oil in the west of the Kelasu tectonic zone is originated from the source rocks of the Qiakemake Formation of Middle Jurassic, and it underwent two stages of hydrocarbon accumulation, i.e., "oil accumulation in the early stage of and gas accumulation in the late stage". The dry gas in the east is mainly derived from the source rocks of the Huangshanjie Formation of Upper Triassic in the pattern of one-stage hydrocarbon accumulation. In this way, the hydrocarbon accumulation characteristics of dry gas in the east and condensate gas in the west are formed. In conclusion, a favorable trap with natural gas resources of more than a trillion cubic meters is developed in the Bozi-Dabei Block, a series of gas reservoirs with resources of hundreds of billions cubic meters (e.g. Bozi 9) have been discovered and oil and gas breakthroughs have been realized continuously. In addition, the Bozi-Dabei major gas area with resources of one trillion cubic meters will be implemented in the near future. © 2020, Natural Gas Industry Journal Agency. All right reserved.
引用
收藏
页码：11 / 19
页数：8
相关论文
共 22 条
  • [1] Wang Z., Xie H., Li Y., Et al., Oil and Gas Exploration in Foreland Basin of Kuqa, (2013)
  • [2] Du J., Wang Z., Hu S., Et al., Formation and geological characteristics of deep giant gas provinces in the Kuqa foreland thrust belt, Tarim Basin, NW China, Petroleum Exploration and Development, 39, 4, pp. 385-393, (2012)
  • [3] Zhu G., Zhang S., Chen L., Et al., Coupling relationship between natural gas charging and deep sandstone reservoir formation: A case from the Kuqa Depression, Tarim Basin, Petroleum Exploration and Development, 36, 3, pp. 347-357, (2009)
  • [4] Zhuo Q., Li Y., Song Y., Et al., Evolution of Paleogene saline deposits and effectiveness of traps in Kelasu tectonic zone, Kuqa Depression, Tarim Basin, Petroleum Geology & Experiment, 35, 1, pp. 42-47, (2013)
  • [5] Li J., Zhang C., Li J., Et al., Tectonic compaction and its influence on reservoirs in the Kuqa foreland basin, Tarim, Petroleum Exploration and Development, 38, 1, pp. 47-51, (2011)
  • [6] Liu C., Xu Z., Chen G., Et al., Hydrocarbon accumulation conditions and evolution process of the ZQ1 large condensate gas reservoir in the Qiulitage structural belt, Tarim Basin, Natural Gas Industry, 39, 4, pp. 8-17, (2019)
  • [7] Neng Y., Wu G., Huang S., Et al., Formation stage and controlling factors of the paleo-uplifts in the Tarim Basin: A further discussion, Natural Gas Industry, 36, 4, pp. 27-34, (2016)
  • [8] He D., Yang H., Guan S., Et al., Formation mechanism and tectonic types of intracratonic paleo-uplifts in the Tarim Basin, Earth Science Frontiers, 15, 2, pp. 207-221, (2008)
  • [9] Wu G., Li Q., Xiao Z., Et al., The evolution characteristics of paleo-uplifts in Tarim Basin and its exploration directions for oil and gas, Geotectonica et Metallogenia, 33, 1, pp. 124-130, (2009)
  • [10] Wu F., Guo H., Diao Y., Et al., Seismic processing technologies for double complex structures in the Qiulitage structural belt, Tarim Basin, Natural Gas Industry, 39, 4, pp. 28-36, (2019)
123