Features and recognition for seismic facies of Permian volcanic reservoirs in the Sichuan Basin

被引：0

作者：

Chen X. ^{[1
]}

He Q. ^{[1
]}

Ran Q. ^{[1
]}

Chen K. ^{[1
]}

Han S. ^{[1
]}

Huang T. ^{[1
]}

Lü Y. ^{[1
]}

机构：

[1] Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, 610041, Sichuan

来源：

Natural Gas Industry | 2019年 / 39卷 / 02期

关键词：

Effusive facies; Imaging processing; Low-frequency amplitude-preserved processing; Matching technology for seismic exploration; Permian; Reservoir inversion; Seismic facies model; Sichuan Basin; Volcanic rock;

D O I：

10.3787/j.issn.1000-0976.2019.02.004

中图分类号：

学科分类号：

摘要：

Exploration of volcanic gas reservoirs in the Sichuan Basin is faced with a series of difficulties, e.g. fewer wells, difficult identification of lithology and lithofacies, undefined reservoir distribution, and unmatched seismic prediction technology of reservoirs. In order to characterize the favorable lithofacies of volcanic rocks in the Sichuan Basin, to qualitatively and quantitatively predict reservoirs, we carried out seismic imaging quality processing on the target layers of volcanic rocks based on low-frequency amplitude-preserved processing, and interpreted and characterized the distribution range of volcanic rocks by establishing the seismic reflection model of volcanic rocks. Then, the seismic facies model of volcanic rock was established based on the seismic response characteristics of volcanic rocks in the southwest of the Sichuan Basin to identify the volcanic edifices and characterize the favorable lithofacies of volcanic rocks. Finally, wave impedance inversion of the volcanic reservoirs in Well Block Yongtan 1 and qualitative and quantitative reservoir prediction were conducted based on facies control. And the following research results were obtained. First, the seismic data processing method based on low-frequency amplitude-preserved processing is effective in improving the image quality inside volcanic rocks and their underlying formations. Second, the identification mode of Permian volcanic rocks is continuous strong peak refection or discontinuous moderate peak reflection at the top boundary and weak reflection at the bottom boundary. And 5 types of seismic reflection characteristics and 3 seismic facies of volcanic rocks (effusive facies, overflow facies and volcanic sedimentary facies) are identified. Third, in the Jianyang-Santai area, effusive facies is extensively distributed. Near-crater effusive facies developed in the most favorable reservoirs is distributed in the dotted form along the northeast with an area of 1 500 km2, and far-crater effusive facies developed in the secondary favorable reservoirs covers an exploration area of 6 000 km2. Fourth, favorable reservoirs in Well Block Yongtan 1 cover an area of 600 km2 and their thickness is between 10 m and 200 m. They are mainly distributed in Chengdu-Jianyang area with a huge natural gas exploration potential. In conclusion, the matching technologies developed in this paper (e.g. the seismic data processing based on low-frequency amplitude-preserved processing, the lithology and lithofacies identification and interpretation of volcanic rock, and the facies-control wave impedance inversion) are suitable for the prediction of Permian volcanic reservoirs in the Sichuan Basin, and they provide a technical support for oil and gas exploration in this field. © 2019, Natural Gas Industry Journal Agency. All right reserved.

引用

页码：28 / 36

页数：8

共 21 条

[1] Yang Y., Zhang B., Jiang D., Pei S., Zhou Z.-Y., A preliminary study on hydrocarbon pooling patterns of the Upper Permian Emeishan basalts in southwestern Sichuan Basin, Natural Gas Industry, 30, 5, pp. 46-49, (2010)
[2] Deng M., Hou M., Zhang B., Li X., Favorable reservoir analysis of Emeishan basalt in Zhougongshan area of southwest Sichuan Province, Geology in China, 41, 2, pp. 378-386, (2014)
[3] Hou M., Wang W., Zhang B., Wang W., Li X., Deng M., Et al., Fluid types and activities of Emeishan basalt in Zhougong mountain-Hanwang field of Sichuan Province, Acta Petrologica Sinica, 29, 8, pp. 2709-2718, (2013)
[4] Xiong L., Zhang B., He L., Yang Y., Zou J., Ran F., Et al., Eruption setting and distribution of the Permian basalt at the southwest end of the West Sichuan Depression, Acta Geologica Sichuan, 31, 3, pp. 260-265, (2011)
[5] Wang P., Chi Y., Liu W., Cheng R., Shan X., Ren Y., Volcanic facies of the Songliao Basin: Classification, characteristics and reservoir significance, Journal of Jilin University (Earth Science Edition), 33, 4, pp. 449-456, (2003)
[6] Zhang X., Wang D., Analysis on oil and gas reservoir characteristics of volcanic rocks, World Geology, 20, 3, pp. 272-278, (2001)
[7] Wang Z., The describe of lithology and facies of volcanic rocks and analysis of factors controlling volcanic reservoir in Che 47 wellblock of Chepaizi area, (2016)
[8] She D., Wu J., Li P., Jin X., Application of low-frequency signals to imaging of deep layers in subbasalt areas, Journal of Hohai University (Natural Sciences), 34, 1, pp. 83-87, (2006)
[9] Hu X., Song J., Shuai P., Seismic acquisition technology for geological targets under the shield of basalt: A case study on M Block, Iceland, China Petroleum Exploration, 22, 4, pp. 116-122, (2017)
[10] Hanssen P., Hampson G., Jakubowicz H., Dobson A., Li X., Ziolkowski A., Et al., Use of low frequencies for sub-basalt imaging, Geophysical Prospecting, 51, 3, pp. 169-182, (2003)

← 1 2 3 →