Salt Lake Source Rock Evaluation by Logging Data

Salt lake source rock rich in gypsum and salt, these compounds makes the logging response of source rock change significantly. Based on the experimental data, the relationships between TOC and log information of gypsum (salt)-bearing mudstone, gypsum (salt) mudstone and mudstone have been studied. Research shows that: TOC of mudstone and gypsum-bearing mudstone is proportional to AC and LogRt, inversely proportional to DEN. TOC of gypsum(salt) mudstone is proportional to DEN and inversely proportional to LogRt. Based on the results of this research, the evaluation method of salt lake source rocks by logging information has been established. First, distinguish the types of source rocks by ΔGR, then TOC evaluation model of different kinds of lithology is established on  the basis of experiment data.  finally, the correlation between the experimentally measured S₁+S₂and TOC has been studied, so that the TOC and hydrocarbon potential of source rocks can be calculated by log data. The characteristics and distribution of lower submember of 4^th member of Shahejie formation source rock are studied in this way. The study found that a high degree of agreement between the predicted TOC and experimented TOC which proves the method has some promotional value.