Abstract
The North Ustyurt basin, located in Central Asia, is an important gas-bearing potential area, but the gas source has been the key difficult point. Based on the geo-chemical analysis of Jurassic mudstone samples and research on the petroleum geology, the qualitative evaluation was conducted, it proposed that middle Jurassic source rock was dominative hydrocarbon-generation source rock for relative high organic matter abundance and maturity compared to upper and lower Jurassic source rocks. According to the thickness distribution of dark mudstones, Kosbulak sag, Sudochi sag and Barsakelmes sag were preferable hydrocarbon-generation sags.
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