Shale primary porosimetry based on 2D nuclear magnetic resonance of T1-T2

• DOI: 10.1016/j.engeos.2023.100270
• Publication Date: 2023-12-05T23:35:16Z
• Authors: Junliang Li; Min Wang; Min Wang; Jinbu Li; Xinbin Zhao; Xingzhong Hu; Aibing Fu
• Keywords: Porosimetry; Coring

Porosity, a key parameter in assessing the physical properties of shale reservoirs and reserves, is great significance to selection evaluation sweet spots. There are many methods at present characterize porosity, most which aimed post-core cleaning shale, such as those involving helium saturated fluid (namely liquid-involved porosimetry). However, due low efficiency core possible effect pore structure during process, it's hard guarantee accuracy porosity measurement. In this regard, we resort two-dimensional (2D) nuclear magnetic resonance (NMR) technology T1-T2 characterizing primary with samples taken from full-closure coring 4th member Shahejie Formation (Sha 4 Member) well Fanxie 184 Jiyang Depression. Moreover, comparative experiments measurement by three methods, namely simultaneous distillation extraction (SDE), measurement, carried out simultaneously. The results show that values obtained SDE, gas liquid similar, about 0.6 time 2D NMR porosimetry. Core tends seriously affect liquid. addition, treatment bound change structure, especially true clay swell; consequently, be distorted methods. It thereby recommended utilize total without cleaning. effective cored under full closure determined T2 cutoff value around 0.3 ms.