Prediction of shale content in tight sandstone reservoirs of the Lower He 8 Member in Jingbian Gasfield

doi:10.3969/j.issn.1006-6535.2025.06.009

Abstract

Abstract: To address challenges such as complex and variable sandstone types, unclear identification of lithology and effective reservoirs and low accuracy in porosity log interpretation in the tight sandstone reservoir of the Lower He 8 Member of the Upper Paleozoic Shihezi Formation in the Ordos Basin, a prediction model for shale content of these three types of sandstone was established through analysis of the logging response characteristics of quartz sandstone, lithic quartz sandstone and lithic sandstone. The results indicate that the distribution ranges of natural gamma logging values for quartz sandstone, lithic quartz sandstone and lithic sandstone are large, with minimum values of 20.0, 30.0 and 40.0 API respectively;The absolute error of the shale content prediction model is less than 5.0%, indicating reliable prediction accuracy of the model. This achievement can provide technical support for lithology identification and effective reservoir prediction in the study area and also provide reference for calculating shale content and porosity in other complex tight sandstone reservoirs.

Key words: shale content, tight sandstone, low porosity and low permeability reservoir, Lower He 8 Member, logging response characteristics, Jingbian Gasfield

CLC Number:

TE122

LUO Guanghui, DAI Heng, YU Jie, ZHANG Xiaoli, YANG Yi, LI Yajun, YAN Yuanzi, ZHOU Zhijie. Prediction of shale content in tight sandstone reservoirs of the Lower He 8 Member in Jingbian Gasfield[J]. Special Oil & Gas Reservoirs, 2025, 32(6): 78-85.

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