沙市背斜东翼下第三系沙市组二段含盐系地层测井响应特征及识别

The Response Characteristic and Recognition of Well Logging in Salt Stratum of Shashi Fm Two-stage Process in Shashi Eastern Anticline Paleogene

资料表明沙市背斜东翼下第三系沙市组二段含盐系地层受区域断层的影响,其展布特征复杂,参杂着泥岩、硬石膏和钙芒硝等非有效矿物的夹层对钻井施工及盐岩开采影响巨大,因此对该套地层主要岩性的测井响应特征及识别研究尤为重要。本文通过对测井数据进行处理,结合邻井相关资料,制作了多张测井系列之间的交汇图,优选出对该区含盐系地层主要岩性区分界限比较明显的图版进行分析,发现了各岩性测井响应特征的区别,达到岩性识别的目的,为优化现场施工技术和优选盐岩首采层等提供重要参考。

The data shows that the salt stratum of Shashi Fm two -stage process in Shashi eastern anticline paleogene has affected by the regional fault, so its distribution is very complex. It has huge impact on the well drilling construction and rock salt exploitation because the interlayer mixes with mudstone, anhydrite, glauberite and some other invalid minerals. As a result, the response characteristic and recognition of well logging for the main rock quality in this stratum are significant. This paper through managing the data of the well logging and combining related data, makes several cross plots between series of well logging, and then selects the parts which show more obvious differences of main rock quality in salt stratum. The differences between the response characteristics of each rock quality well logging have been discovered, and finally achieve the purpose of recognizing rock quality. It provides important reference for optimizing site operation technique and the first exploiting layer of rock salt.