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川东北地区由于位于四川盆地边缘,受沉积相变化和构造运动的影响,该区特别是其中部嘉一段—上二叠统横向变化大,录井分层困难。为此,基于对地层岩性组合、测井电性以及镜下生物特征的分析,分别探讨了下三叠统飞仙关组四段与上下邻层、飞仙关组与上二叠统长兴组、长兴组与上二叠统龙潭组的录井分层问题。研究认为:①要做到准确快速地地质分层,必须要在区域上建立一套行之有效的分层标准,既便于现场录井人员掌握,又能在电性上具有横向对比的特点;②不论是依据现场岩屑还是测井曲线,遇到地层横向变化差异较大时,都应从沉积相和构造运动这两大影响因素进行宏观综合考虑;③在分层岩性、电性特征均不明显的情况下,特别是川东北地区局部构造上,飞仙关组与长兴组石灰岩与石灰岩接触分层十分困难,可选样做分析化验,并综合利用多种手段来进行分层。
Due to the influence of sedimentary facies changes and tectonic movements, the northeastern Sichuan region is affected by sedimentary facies changes and tectonic movements. Especially in the central part of Jia-Yi-Upper Permian, the lateral variation of the Upper Permian is large, and logging delamination is difficult. Therefore, based on the analysis of stratigraphic lithology, logging electrical properties and microscopic biological characteristics, the authors discuss the characteristics of lithofacies, lithofacies and microfacies in the Lower Triassic Feixianguan Formation and its upper and lower adjacent layers, Feixianguan Formation and Upper Permian Changxing Well logging delamination in Changxing Formation, Upper Changxing Formation and Upper Permian Longtan Formation. The study shows that: ①Aiming at accurate and rapid geological stratification, a set of effective stratification standards must be established in the region, which not only can be mastered by on-site logging personnel but also has the characteristics of lateral contrast in electrical properties; ② Whether it is based on on-site cuttings or well logging curves, macro-comprehensive consideration should be made from the two major influencing factors of sedimentary facies and tectonic movement in the case of large differences in lateral lateral variation; ③ In layered lithology and electrical characteristics Obvious circumstances, especially in the northeastern part of Sichuan Province, the local structure, the Feixianguan Formation and Changxing Formation of limestone and limestone contact stratification is very difficult, the sample can be used for analysis, and comprehensive use of a variety of means to stratification.