Gas Physical Properties and their Implication on Gas Saturation and Leakage in Deep Reservoirs - A Case Study of Cambrian Gas Field, Sichuan Basin, China

Tian, Hua (Research Inst Petr Expl & Dev, Petrochina) | Zou, Caineng (Research Inst Petr Expl & Dev, Petrochina) | Liu, Shaobo (Research Inst Petr Expl & Dev, Petrochina) | Zhang, Shuichang (Research Inst Petr Expl & Dev, Petrochina) | Lu, Xuesong (Research Inst Petr Expl & Dev, Petrochina) | Ma, Xingzhi (Research Inst Petr Expl & Dev, Petrochina) | Bi, Lina (Research Inst Petr Expl & Dev, Petrochina) | Yuan, Miao (Research Inst Petr Expl & Dev, Petrochina)

OnePetro 

A series of petrohysical experiments have been conducted to obtain the gas physical properties (e.g., gas-water interfacial tension). The capillary pressures of pore throats were obtained through numerical calculation. Furthermore, residue water was used to calculate gas/water saturation in the reservoirs. The gas saturation variation under lower interfacial tension and the amount of gas lost during the uplift in burial history need an in-depth examination (Tian et al., 2017). In addition to the geological studies in the field, various laboratory methods were used to tackle the problems mentioned above, including Nlear nuclear magnetic resonance (NMR) and fluid inclusion analysis with optical and Laser Raman spectroscopy. During the charging history, hydrcarbon saturations at different temperature and pressure was calculated using the model established in this paper, which is mainly determined by the pore size distribution obtained by the NMR analysis. The charging pressure is measured by fluid inclusion study with optical and Laser Raman spectroscopy test. Furthermore, the leakage content of gas during the burial history was calculated using a diffusion model (Krooss& Leythaeuser., 1988; Krooss et al., 1992).