Discussion on main controlling factors of natural gas enrichment and high yield in tight sandstone gas reservoirs：Case study of Xujiahe Formation in Sichuan Basin

Zhao Zheng-wang, Tang Da-hai, Wang Xiao-juan, Chen Shuang-ling

doi:10.11764/j.issn.1672-1926.2019.03.014

2019 , Vol. 30 >Issue 7: 963 - 972

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.03.014

Discussion on main controlling factors of natural gas enrichment and high yield in tight sandstone gas reservoirs：Case study of Xujiahe Formation in Sichuan Basin

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Exploration and Development Research Institute of PetroChina Southwest Oiland Gas Field Branch，Chengdu 610041,China

Zhao Zhengwang(1975-), Male, Senior engineer, Master, Mainly engaged in comprehensive research of oil and gas geology research. E-mail：zhao_zw＠petrochina.com.cn.

Received date: 2018-10-07

Revised date: 2019-03-27

Online published: 2019-08-07

Supported by

Supported by the Major Science and Technology Projects of CNPC “Potential analysis of natural gas resources and new areas exploration targets evaluation in Sichuan Basin” (Grant No. 2016E-0601).

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Abstract

After more than ten years of vigorous development，China’s tight sandstone gas has become a big producer of tight sandstone gas，second only to the United States and Canada.Its exploration effect is remarkable.However，“how to benefit exploration and development” has become the key issues of tight sandstone gas reservoirs，and the study of its enrichment and high yield factors is imminent.In view of this problem，this paper takes the second member of Xujiahe Formation in the central Sichuan Basin as an example，through the dissection of high-yield gas wells，starting from the basic geological characteristics of sedimentary environment，reservoir stratum，hydrocarbon source，structure and gas reservoir，analyzes the main controlling factors of rich gas and high yield，and then discusses the natural gas enrichment model.Two results have been achieved.First，the natural gas enrichment and high yield in the second member of Xujiahe Formation are mainly controlled by five factors，and the different regions have different emphases.Specifically，paleo-uplift macroscopically controls the distribution of high-yield gas wells.High-yield gas wells are mainly distributed in structural traps or nose bulges，and fractures are important factors for the formation of high-yield gas wells；(1)in uplift zone，the contribution of high-quality reservoirs to the formation of high-yield gas wells is relatively strong；(2)in slope zone，the contribution of hydrocarbon sources is more obvious.Second，there are three reservoir-forming modes and two types of high-yield hydrocarbon accumulation modes in the second member of Xujiahe Formation in the central Sichuan Basin.The reservoir-forming modes are as follows：The reservoir-controlling mode of relatively high quality reservoirs in Hechuan-Yingshan area in the eastern part of Central Sichuan，a hydrocarbon source combination model with thin reservoir at the top and huge thickness under it in the Zhongtaishan-Qiulin area in western part of Central Sichuan and the middle reservoir-forming assemblages in Penglai-Gongshanmiao area in Central Sichuan.The pattern of enrichment and high production is characterized by structural-high quality reservoir mode and reservoir-permeability body model.Based on these enrichment and high yield factors and modes，the next exploration direction and key exploration fields are preliminarily predicted，in order to guide the efficient exploration and development of tight gas in this area.

Key words： Tight sandstone; Gas reservoir; Natural gas; Enrichment and high yield; High yield mode; Sichuan Basin; Upper Triassic; Xujiahe Formation

Cite this article

Zhao Zheng-wang, Tang Da-hai, Wang Xiao-juan, Chen Shuang-ling . Discussion on main controlling factors of natural gas enrichment and high yield in tight sandstone gas reservoirs：Case study of Xujiahe Formation in Sichuan Basin[J]. Natural Gas Geoscience, 2019 , 30(7) : 963 -972 . DOI: 10.11764/j.issn.1672-1926.2019.03.014

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