鄂西地区大隆组海相泥页岩天文旋回沉积响应及岩相演化规律

岩相是泥页岩研究的基本单元，岩相展布和组合关系的研究，是认识产（油）气规律和产能预测的理论基础。但是由于泥页岩粒度相对均一，传统的层序地层学手段在泥页岩非均质性研究上表现出了明显的弊端。已有研究表明，天文旋回能够控制海相泥页岩的沉积作用。建立天文旋回约束下的泥页岩沉积作用是认识岩相叠置规律和预测泥页岩储层的前提。本项目拟以鄂西地区上二叠统大隆组泥页岩为研究对象，采用岩心、薄片观察、阴极发光、XRD分析、地球化学分析等方法探索泥页岩矿物组分来源、成因和沉积结构、构造特征成因机制，深入分析各层级天文旋回（偏心率、斜率、岁差、太阳黑子）对泥页岩沉积作用和沉积机制的影响，揭示不同层级天文旋回约束下泥页岩岩相演化规律。本研究将从天文旋回视角来探索泥页岩岩相沉积发育规律，为非常规油气勘探提供新的思路。

Lithofacies is the basic unit of shale research, and the study of lithofacies distribution and association is the theoretical basis for recognizing production (oil) gas law and productivity prediction. However, because of the relatively uniform grain size of shale, the traditional sequence stratigraphy methods have obvious disadvantages in the study of shale heterogeneity. Previous studies have shown that astronomical cycles can control the sedimentation of marine shales. The establishment of shale sedimentation under the constraints of astronomical cycles is a prerequisite for understanding the law of lithofacies superimposition and predicting shale reservoirs. This project is intended to study the shale of the upper permian Dalong formation in western Hubei, the origin, genesis, sedimentary structure and structural features of the mineral components of the shale are explored by means of core, thin section observation, Cathodoluminescence, XRD and geochemistry analysis, the influence of astronomical cycles (eccentricity, slope, precession, sunspot) at different levels on the sedimentary process and mechanism of mudstone shale is analyzed. This study will explore the law of sedimentary development of shale facies from the perspective of astronomical cycle, and provide a new idea for unconventional oil and gas exploration.