A new method for grading and assessing the potential of tight sand gas resources: A case study of the Lower Jurassic Shuixigou Group in the Turpan-Hami Basin, NW China

被引:8
|
作者
Wang Weiming [1 ]
Lu Shuangfang [1 ]
Chen Xuan [2 ]
Li Xingwei [3 ]
Li Jijun [1 ]
Tian Weichao [1 ]
机构
[1] China Univ Petr Huadong, Res Inst Unconvent Petr & Renewable Energy, Qingdao 266580, Peoples R China
[2] PetroChina Tuha Oilfield Co, Petr Explorat & Dev Res Inst, Hami 839009, Peoples R China
[3] PetroChina Daqing Oilfield Co, Petr Explorat & Dev Res Inst, Daqing 163712, Peoples R China
基金
中国国家自然科学基金;
关键词
tight sand gas; reservoir microscopic pore structure; specific surface area; pore size distribution; reservoir potential assessment parameter; resource grading; Turpan-Hami Basin; RESERVOIR; OIL;
D O I
10.1016/S1876-3804(15)60007-6
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
A grading system from a pore structure perspective for assessing the quality of tight gas reservoirs in China is proposed based on an analysis of wettability, adsorption and pore throat size distribution and experiments including X-ray diffraction, contact angle measurement and static nitrogen adsorption, upon tight sand samples, from wells in Turpan-Hami Basin, western China. The hydrophilicity of tight sand has nothing to do with the overall clay content; instead, it is linked to the content of illite. Higher illite content means stronger hydrophilicity of the rocks. Indonesia's formula is proven to be more suitable for the interpretation of gas saturation measurement in tight reservoirs with higher content of illite. The microscopic pore structure of tight reservoir is clearly related to the porosity. The tight sandstone reservoir with low porosity is characterized by high proportion of small pores and high drainage pressure, while the tight sandstone reservoir with high porosity is characterized by high proportion of large pores, low drainage pressure and large average pore size. In view of endowment and flowing of tight sand gas, a new reservoir potential assessment parameter is established by porosity, permeability and gas saturation. The parameter relates to the porosity in a clear manner of trichotomy. Given the porosity of 6% and 4% as threshold, the tight sand gas can be divided into three types: I (Good), II (Potential) and III (Challenging). The trichotomy corresponds to a consistent porosity limit with the pore size change.
引用
收藏
页码:66 / 73
页数:8
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