Caprock characteristics and sealing ability evaluation of Sinian-Cambrian gas reservoirs in Gaoshiti-Moxi Area, Sichuan Basin

被引：0
作者：
Zhang, Lu [1 ,2 ]
Xie, Zeng-Ye [1 ,2 ]
Wang, Zhi-Hong [1 ,2 ]
Zhan, Ming-Wang [1 ,3 ]
Guo, Jian-Ying [1 ,2 ]
Li, Ya-Hong [1 ,2 ]
机构：
[1] Research Institute of Petroleum Exploration & Development-Langfang, CNPC, Langfang
[2] Laboratory of Gas Reservoir Formation and Development, CNPC, Langfang
[3] Northeast Petroleum University, Daqing
来源：
Natural Gas Geoscience | 2015年 / 26卷 / 05期
关键词：
Cambrian; Caprocks; Gaoshiti-Moxi area; Natural gas reservoirs; Overpressure sealing; Sinian;
D O I：
10.11764/j.issn.1672-1926.2015.05.0796
中图分类号：
学科分类号：
摘要：
The reason why Sinian-Cambrian gas reservoirs in the Moxi area of the Sichuan Basin can survive well and why there is a great difference between pressure coefficient of Dengying reservoirs and Longwangmiao reservoirs have attracted more and more scientists. A detailed study of gas reservoir caprock characteristics and sealing ability by the combination of macroscopic and microscopic as well as geology dissection and simulation experiment has been carried out. Cambrian shale caprocks, Permian overpressure shale caprocks and Low-Middle Triassic gypsum caprocks are regionally distributed in the study area. The characteristics of caprocks are as follows, porosity is mainly less than 3%, permeability is (0.001-0.02)×10-3μm2, average throat radius ranges from 0. 6μm to 1.2μm, pore size is mostly concentrated in 400-500nm, breakthrough pressure is more than 15MPa, and diffusion coefficient ranges from 1.03×10-10cm2/s to 2. 36×10-7cm2/s. Caprocks have certain sealing ability, but the reason that Longwangmiao Gasfield can survive for a long history is the result of interaction of capillary sealing and overpressure sealing. Understandings above can be used to interpret formation reason of atmospheric and overpressure gas reservoirs in the study area reasonably. Meanwhile, it can be used for predicting favorable distribution of large gas field. ©, 2015, Science Press. All right reserved.
引用
收藏
页码：796 / 804
页数：8
相关论文
共 20 条
  • [1] Liu S., Qin C., Lubomir J., Et al., Transformation of oil pools into gas pools as results of multiple tectonic events in Upper Sinian(Upper Neoproterozoic), deep part of Sichuan Basin, China, Energy Exploration& Exploitation, 29, 6, pp. 649-697, (2011)
  • [2] Yao J., Chen M., Hua A., Et al., Formation of the gas reservoirs of the Leshan-Longnvsi Sinian Palaeo-uplift in central Sichuan, Petroleum Exploration and Development, 30, 4, pp. 7-9, (2003)
  • [3] Xu C., Shen P., Yang Y., Et al., Accumulation conditions and enrichment patterns of natural gas in the Lower Cambrian Longwangmiao Fm reservoirs of the Leshan-Longnvsi Paleohigh, Sichuan Basin, Natural Gas Industry, 34, 3, pp. 1-7, (2014)
  • [4] Wei G., Liu D., Zhang L., Et al., The exploration region and natural gas accumulation in Sichuan Basin, Natural Gas Geoscience, 16, 4, pp. 437-442, (2005)
  • [5] Jiang H., Wang Z., Du H., Et al., Tectonic evolution of the Leshan-Longnvsi Paleo-uplift and reservoir formation of Neoproterzoic Sinian gas, Natural Gas Geoscience, 25, 2, pp. 192-200, (2014)
  • [6] Wei G., Shen P., Yang W., Et al., Formation conditions and exploration prospects of Sinian large gas fields, Sichuan Basin, Petroleum Exploration and Development, 40, 2, pp. 129-138, (2013)
  • [7] Zheng P., Shi Y., Zou C., Et al., Natural gas sources in the Dengying and Longwangmiao Fms in the Gaoshiti-Maoxi area, Sichuan Basin, Natural Gas Industry, 34, 3, pp. 50-54, (2014)
  • [8] Wei G., Xie Z., Bai G., Et al., Organic geochemical characteristics and origin of natural gas in Sinian-Lower Paleozoic reservoirs, Sichuan Basin, Natural Gas Industry, 34, 3, pp. 44-49, (2014)
  • [9] Huang W., Liu S., Wang G., Et al., Geological conditions and gas reservoir features in Lower Paleozoic in Sichuan Basin, Natural Gas Geoscience, 22, 3, pp. 465-476, (2011)
  • [10] Wang J., Applications of a new method of confocal microsystem to geological studies, Geological Review, 50, 2, pp. 215-517, (2004)
12