利用测井信息评价盐湖相烃源岩

盐湖相烃源岩富含膏、盐质成分，使其测井响应特征发生极大改变，给测井评价烃源岩带来困难。基于实测数据，分析了盐湖相烃源岩中普遍发育的纯泥岩、含膏(盐)泥岩和膏(盐)质泥岩有机碳含量的测井响应模式，发现纯泥岩和含膏(盐)泥岩TOC与AC和LogRt呈正比，与DEN呈反比，膏(盐)质泥岩TOC与DEN呈正比，与LogRt呈反比，并基于此建立了盐湖相烃源岩测井评价方法，即首先利用ΔGR区分岩性，再针对不同岩性建立TOC评价模型，最后根据实测S₁+S₂和TOC建立相关关系，就可以求取烃源岩的TOC和S₁+S₂。利用该方法对东营凹陷沙四下亚段烃源岩性质和展布进行分析，发现预测TOC与实测TOC吻合程度高，具有一定推广价值。

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 4th 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.