Correction of Measured Reservoir Physical Properties of Jiamuhe Formation in Zhongguai Uplift of Junggar Basin

doi:10.7657/XJPG20210615

Abstract

Abstract:

The measured permeability of the cores from the tight sandstone reservoir in the Jiamuhe formation of the Zhongguai uplift in the northwestern margin of the Junggar basin ranges from 0.1 mD to 1000 mD, which is 4-6 orders of magnitude different from the permeability calculated from logging. The measured permeability is obviously distorted, which affects the accuracy of reservoir evaluation. Based on the geological background of the study area and combined with well logging and core data, 644 thin sections from 10 wells in the area are analyzed and the main causes of reservoir physical property distortion are studied based on mercury injection method, cast thin section, X-ray diffraction, image analysis and statistics and other methods. The results show that the pseudo granular marginal fractures formed by the decompressed expansion of the cement laumontite are the main reason for the abnormally high permeability measured from the cores taken to surface; the content of laumontite positively correlates to the surface porosity of pseudo fracture, and to the ratio of formation resistivity to neutron porosity. When the laumontite content is less than 5%, and the surface porosity of pseudo granular marginal fractures is less than 1%, the porosity has a good correlation with permeability. However, with the increase of the laumontite content, the permeability increases obviously (mostly more than 1 mD), which is inconsistent with the reservoir type and well logging results in the area. Based on the analysis of rock thin section and well logging data, the correlations between surface porosity of the pseudo fractures and laumontite content and pseudo fracture porosity are determined. By referring to the well logging porosity and eliminating the pseudo fracture porosity, the corrected true porosity and corresponding permeability values are obtained. The corrected reservoir permeability values mainly range from 0.001 mD to 5.000 mD, which is close to the permeability from well logging interpretation, proving that this correction method is reliable.

Key words: Junggar basin, Zhongguai uplift, Jiamuhe formation, reservoir, laumontite, cement, pseudo granular marginal fracture, physical property correction

CLC Number:

TE121.3

YANG Chuan, WU Tao, LI Xiao, ZENG Delong, QIU Peng, FENG Xin, DAI Canxin. Correction of Measured Reservoir Physical Properties of Jiamuhe Formation in Zhongguai Uplift of Junggar Basin[J]. Xinjiang Petroleum Geology, 2021, 42(6): 749-755.

Figures/Tables 8

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Table 1

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