Authigenic minerals and diagenetic evolution in altered volcanic materials and their impacts on hydrocarbon reservoirs: evidence from the lower Permian in the northwestern margin of Junggar Basin, China

Potentially, volcanic and volcaniclastic rocks are significant hydrocarbon reservoir rocks. In these rocks, the low-temperature alteration ( 4 % vol) damaged the reservoir quality. The dissolution of laumontite was significant for deep reservoir quality. Coarse conglomerate with soluble analcime cements developed many secondary dissolution pores and were the most favourable clastic reservoir.