PDF(8172 KB)
Identification of gas-bearing characteristics in tight sandstone controlled by favorable lithofacies of He 8 member in western area of Jingbian Gas Field
LianLian QIAO, Jing LI, Hao NIU, MiMi BAI, HaoYu LI, TingBo ZONG, XiaoLi ZHANG, YaJun LI, Yi YANG, Peng BAI, TianYu HAN
Prog Geophy ›› 2026, Vol. 41 ›› Issue (4) : 1722-1731.
PDF(8172 KB)
PDF(8172 KB)
Identification of gas-bearing characteristics in tight sandstone controlled by favorable lithofacies of He 8 member in western area of Jingbian Gas Field
Clarifying the relationship between the gas-bearing characteristics of tight sandstone and the lithological characteristics is very important for identifying and evaluating the gas-bearing characteristics. In order to clarify the characteristics of the tight sandstone types and its gas-bearing in He8 Member of the western part of the Jingbian gas field, based on the thin sections, physical properties, gas testing data and well logging data, the analysis of the lithological characteristics of sandstone was carried out, then, the physical characteristics and gas-bearing characteristics of quartz sandstone, lithic quartz sandstone and lithic sandstone were discussed. The sandstone type of He8 Member is mainly lithic quartz sandstone, followed by lithic sandstone and quartz sandstone. The characteristics of the gamma-ray curve and photoelectric absorption cross section index of the three types of sandstone are obviously different. Based on the two logging parameters, the constructed sensitive litho-parameter can better indicate the sandstone type. Meanwhile, the corresponding analysis of the gas testing conclusion and the characteristics of sandstone type reveals that the gas-bearing of quartz sandstone is generally good, and the single test/commingled test conclusion are the gas layer and the gas-bearing layer; the gas-bearing of lithic quartz sandstone is generally good, and the commingled test conclusion are the gas layer, the gas-bearing layer, the gas-water layer, a small amount of water layer, and the lithic quartz sandstone with high mud content or relatively high lithic content is mostly dry layer; the gas-bearing of the lithic sandstone is generally poor, and the gas-bearing of the commingled test conclusion are mainly dry layer, a small amount of gas-bearing layer and gas layer; the quartz sandstone is favorable for gas-bearing in He 8 member. And then, Gas-I, a gas-sensitive signal combination enhancement factor based on the combination of deep lateral resistivity, acoustic time difference, compensation neutron and gamma-ray parameters that is sensitive to gas response, can better characterize the gas-bearing of sandstone. In addition, due to the lithology, physical properties and pore structure of the tight sandstone reservoir, which affect its gas-bearing, the gas-bearing characteristics of sandstone in the mixed area in the plot of litho-parameter and Gas-I are complex, It is necessary to further carry out targeted analysis and in-depth research in combination with other well logging data and special well logging data.
Lithofacies / Tight sandstone / Sensitive parameters / Gas-bearing / Enhancing factor
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感谢审稿专家提出的修改意见和编辑部的大力支持!
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