High Immobile Water Saturation in Linxing Gas Reservoir: Genesis and Impacts on Gas Layer Resistivity

doi:10.7657/XJPG20230212

Abstract

Abstract:

The gas layers in the He 4 member in the Linxing gas reservoir are low-resistivity gas layers with industrial productivity. These gas layers of diverse genesis exhibit complex gas-water relationship，making them difficult to be identified. By means of cast thin section，scanning electron microscopy (SEM)，X-ray diffraction (XRD) and nuclear magnetic resonance (NMR)，and combined with the logging response characteristics of low-resistivity gas layers，the high immobile water saturation in the low-resistivity gas layers in the He 4 member was analyzed for its genesis and impacts on gas layer resistivity from microscopic and macroscopic perspectives. The analysis results show that the microporous water within chlorite film is the main source of the high-saturation immobile water in the low-resistivity gas layers in the He 4 member. It is found that the high content of highly connected immobile water within the chlorite film can greatly reduce the resistivity of the gas layers.

Key words: Linxing gas reservoir, low-resistivity gas layer, immobile water saturation, gas layer resistivity, chlorite film, micropore water, digital core, connectivity

CLC Number:

TE122

LIU Zaizhen, LI Yangbing, HU Weiqiang, LENG Jie, CAI Ruihao, XIE Lan, LIU Xueqing. High Immobile Water Saturation in Linxing Gas Reservoir: Genesis and Impacts on Gas Layer Resistivity[J]. Xinjiang Petroleum Geology, 2023, 44(2): 217-223.

Figures/Tables 9

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Table 1.

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