回龙地区大安寨段储层岩性测井解释

Logging Lithology Interpretation of Da'anzhai Section in Huilong Area

回龙大安寨段灰岩是研究区最主要的储集层,但受沉积、成岩等影响,岩性电性特征复杂,增加了岩性解释难度。文章在岩心观察描述、岩心归位及测井曲线标准化基础上,结合常规测井资料开展了岩石电性特征分析,建立了岩性测井解释图版。图版显示砂岩灰岩电性特征混杂;泥岩表现为"三高一低"特征(高自然伽玛,高声波,高中子,低电阻)。在地质统计学原理分析基础上,优选了43个典型岩性样本,建立了定量化的砂岩、泥岩和灰岩的"岩性概率因子曲线",岩性解释精度达到95.7%。所建立的岩性解释方法对该地区的岩性解释和储层评价具有重要意义。

The limestone of Da＇anzhai formation is the main reservoir in Huilong area. Due to effect of sedimentary and diagenesis, the lithologic and electrical characteristics are complex, so the lithologic interpretation becomes difficult. In this paper, based on the core observation, core location and logging curve standardization, the electrical characteristics of the rock were analyzed, and a lithology interpretation chart was established. The chart shows that the electrical characteristics between sandstone and limestone are mixed. The mudstone has the characteristics of high natural gamma, high acoustic wave, high neutron and low resistance. Based on the principle analysis of geological statistics, 43 typical lithological samples were selected to establish the curves of lithology probability factor which is to quantify sandstone, mudstone and limestone.The lithologic interpretation accuracy is 95.7%. The lithology interpretation method for lithology interpretation and reservoir evaluation is of great significance.