塔中西北部顺西地区良里塔格组层序地层格架划分

Division of Sequence Stratigraphic Framework in Lianglitage Formation in Shunxi Area,Northwestern Tazhong

层序地层格架和沉积旋回的分析是碳酸盐岩储层地质研究的基础。运用小波变换和INPEFA测井旋回分析技术对塔中顺西地区良里塔格组层序旋回进行了研究。结果表明:研究区自下而上可划分为3个层序和8个准层序组。其中,SQ1、SQ2主要分布在良里塔格组中下段,均可进一步划分3个准层序组;SQ3主要分布在良里塔格组上段,可细分为2个准层序组;SQ3几乎对应于良里塔格组泥质条带灰岩段,为一个夭折的层序。基于研究区良里塔格组储层的测井评价,阐述了层序地层格架内储层的分布特征,认为SQ2控制了有利储层的分布。这对于深入探讨良里塔格组储层的分布规律和成因机制具有重要的意义。

The analysis of sequence stratigraphic framework and sedimentary cycle is the basis for the study of carbonate reservoir geology. The sequence stratigraphy of the Lianglitage Formation in Shunxi area of Tazhong was studied by using wavelet transform and INPEFA logging cycle analysis. The results show that the study area can be divided into three sequences and eight parasequence groups from bottom to top. SQ1 and SQ2 are mainly distributed in the middle and lower part of Lianglitage Formation, and both can be further divided into three parasequence groups. SQ3, a premature sequence , is mainly distributed in the upper part of Lianglitage Formation and can be subdivided into two parasequences, almost corresponding to the Lianglitage Formation of mudstone limestone section. Based on the well logging evaluation of the Lianglitage Formation in the study area, the distribution characteristics of the reservoirs in the sequence stratigraphic framework are described, and the distribution of favorable reservoirs is considered to be controlled by SQ2. The results provide significant information for the further study of the distribution and formation mechanism of the Lianglitage Formation.