@article{WANG2023, 
author = {Hongbo WANG and Cunfei MA and Zheng CAO and Zhipeng LI and Zhangcheng HAN and Wenming JI and Yi YANG},
title = {Differential diagenesis and reservoir physical property responses of tight sandstone based on lithofacies: A case study on the Lower Jurassic Sangonghe Formation in Moxizhuang area, Junggar Basin},
year = {2023},
journal = {Oil & Gas Geology},
volume = {44},
number = {4},
pages = {976-992},
keywords = {differential diagenetic evolution, diagenesis mechanism, pore structure, lithofacies, tight sandstone reservoir, Sangonghe Formation, Moxizhuang area, Junggar Basin},
url = {https://www.sciopen.com/article/10.11743/ogg20230414},
doi = {10.11743/ogg20230414},
abstract = {An integration of core observation, casting thin section identification, scanning electron microscopy (SEM) observation, porosity-permeability test of samples and mercury intrusion porosimetry (MIP), in combination with the local burial and hydrocarbon charging history, is applied to the study on the diagenesis, differential lithofacies-based diagenesis mechanism and reservoir pore structure of the Sangonghe Formation in Moxizhuang area, Junggar Basin. The results show that the Sangonghe Formation mainly experienced mechanical compaction, cementation and dissolution during the diagenetic evolution. Reservoirs of diverse lithofacies are significantly different in diagenetic mechanism: the calcareous sandstone facies, argillaceous carbonaceous sandstone facies and volcanic tuffaceous matrix sandstone facies tend to get tight in the early diagenetic stage, while featuring weak diagenesis intensity in the middle stage; the pores of the massive sandstone facies are well preserved in the early diagenetic stage with smooth fluid migration in the middle stage, and there are multi-stage cementation and dissolution occurring in between; and the conglomeratic sandstone and conglomerate facies feature high gravel content, resulting in poor fluid migration, and weak compaction in the early diagenetic stage, while characterized by weak cementation and weak dissolution in the middle stage. The different diagenetic mechanisms for the lithofacies serve to determine the pore structure. The calcareous sandstone facies and argillaceous carbonaceous sandstone facies of lamination texture have poor pore connectivity, complex structure and poor overall physical properties, which are not conducive to oil and gas enrichment; the pore throat of the massive sandstone facies is well sorted, and the pores of the facies are the most developed with strong connectivity, resulting in good overall physical properties, conducive to oil and gas enrichment; the particles of conglomeratic sandstone and conglomerate facies are poorly sorted and in close contact, limiting the pore connectivity to some extent, but the destructive diagenesis intensity is weak, and the overall physical properties are good, conducive to forming effective oil and gas reservoirs.}
}