New understandings of the sedimentation mode of Lower Cambrian Longwangmiao Fm reservoirs in the Sichuan Basin

被引：0
作者：
Yang W. [1 ]
Wei G. [1 ]
Xie W. [1 ]
Liu M. [1 ]
Jin H. [1 ]
Zeng F. [1 ]
Su N. [1 ]
Sun A. [1 ]
Shen Y. [1 ]
Ma S. [1 ]
机构：
[1] PetroChina Research Institute of Petroleum Exploration and Development, Langfang, 065007, Hebei
来源：
| 2018年 / Natural Gas Industry Journal Agency卷 / 38期
关键词：
Early Cambrian; Grain shoal; Lithofacies palaeogeography; Longwangmiao Fm; Natural gas exploration; Platform margin; Restricted platform; Sedimentary facies; Sichuan Basin;
D O I：
10.3787/j.issn.1000-0976.2018.07.002
中图分类号：
学科分类号：
摘要：
Natural gas in the gas reservoirs of Longwangmiao Fm, Lower Cambrian in the Sichuan Basin, is mainly concentrated in grain shoals, so the study on lithofacies palaeogeography and the prediction on grain shoal distribution are the key to improving the success ratio of natural gas exploration in this area. In this paper, outcrop, drilling, seismic and logging data were studied comprehensively. Then, based on previous research results, the sedimentary facies and sedimentary system mode of Longwangmiao Fm in the Sichuan basin and its adjacent areas were researched, and lithofacies paleogeographic maps were prepared. Besides, "three-shoal" sedimentary model of Longwangmiao Fm was established, the distribution range of 3 shoal belts was predicted and their development characteristics and main control factors were analyzed. Finally, the following directions and fields of natural gas exploration were put forward. And the following research results were obtained. First, the paleogeographic pattern of the Sichuan Basin in the Longwangmiao period is a carbonate rimmed platform, and the sedimentary facies of mixed tidal flat, restricted platform, open platform, platform margin and slope are developed. Second, the "three-shoal" sedimentary model of Longwangmiao Fm is established. One of them is the platform-margin grain shoal, and it is distributed along the eastern margin of the Sichuan Basin. The other two are intra-platform grain shoals, and they are distributed on the east and west sides of the lagoon subfacies, belonging to the restricted platform facies and the open platform facies, respectively. Third, the grain shoal of restricted platform facies is the main reservoir of Longwangmiao Fm gas reservoir in the Anyue Gas Field. It is distributed in central Sichuan, and its development is controlled by lagoons and Gaoshiti-Moxi paleouplift. Fourth, the platform-margin grain shoal is mainly distributed along the northern and eastern margins of the basin, and its development is controlled by the slope break of sedimentary paleogeomorphy. In conclusion, the grain shoal of restricted platform facies and the shoal of platform margin facies are good reservoirs and they are the important fields of natural gas exploration. Furthermore, the new understanding of "three-shoal" sedimentary model and grain shoal distribution of Longwangmiao Fm is of great theoretical significance to the study on the sedimentary systems of ancient strata. © 2018, Natural Gas Industry Journal Agency. All right reserved.
引用
收藏
页码：8 / 15
页数：7
相关论文
共 24 条
  • [1] Xu C., Shen P., Yang Y., Luo B., Huang J., Jiang X., Et al., Accumulation conditions and enrichment patterns of natural gas in the Lower Cambrian Longwangmiao Fm reservoirs of the Leshan-Longnüsi Paleohigh, Sichuan Basin, Natural Gas Industry, 34, 3, pp. 1-7, (2014)
  • [2] Du J., Zou C., Xu C., He H., Shen P., Yang Y., Et al., Theoretical and technical innovations in strategic discovery of a giant gas field in Cambrian Longwangmiao Formation of central Sichuan paleo-uplift, Sichuan Basin, Petroleum Exploration and Development, 41, 3, pp. 268-277, (2014)
  • [3] Zou C., Du J., Xu C., Wang Z., Zhang B., Wei G., Et al., Formation, distribution, resource potential and discovery of the Sinian-Cambrian giant gas field, Sichuan Basin, SW China, Petroleum Exploration and Development, 41, 3, pp. 278-293, (2014)
  • [4] Du J., Wang Z., Zou C., Xu C., Wei G., Zhang B., Et al., Geologic Theory and Exploration Practice of Ancient Large Carbonates Gas Field, (2015)
  • [5] Ma X., Innovation-driven efficient development of the Longwangmiao Fm large-scale sulfur gas reservoir in Moxi Block, Sichuan Basin, Natural Gas Industry, 36, 2, pp. 1-8, (2016)
  • [6] Zhang M., Xie Z., Li X., Gu J., Yang W., Liu M., Characteristics of lithofacies paleogeography of Cambrian in Sichuan Basin, Acta Sedimentologica Sinica, 28, 1, pp. 128-139, (2010)
  • [7] Zhou J., Xu C., Yao G., Yang G., Zhang J., Hao Y., Et al., Genesis and evolution of Lower Cambrian Longwangmiao Formation reservoirs, Sichuan Basin, SW China, Petroleum Exploration and Development, 42, 2, pp. 158-166, (2015)
  • [8] Wang L., Shen A., Chen Y., Su W., Lithofacies paleogeography and sedimentary model of Lower Cambrian Longwangmiao Formation in Sichuan Basin, Marine Origin Petroleum Geology, 21, 3, pp. 13-21, (2016)
  • [9] Jin M., Zeng W., Tan X., Li L., Li Z., Luo B., Et al., Characteristics and controlling factors of beach-controlled karst reservoirs in Cambrian Longwangmiao Formation, Moxi-Gaoshiti area, Sichuan Basin, NW China, Petroleum Exploration and Development, 41, 6, pp. 650-660, (2014)
  • [10] Ma T., Tan X., Li L., Zeng W., Jin M., Luo B., Et al., Sedimentary characteristics and lithofacies palaeogeography during Longwangmiao period of Early Cambrian, Sichuan Basin, Acta Sedimentologica Sinica, 34, 1, pp. 33-48, (2016)
123