煤系细粒沉积微细结构及其演化机制

Based on the methods and ideas of sediment logy, reservoir geology, coal geology, high-resolution sequence stratigraphy , and the multidisciplinary, the research will take Luxi and its adjoining areas for a typical example to study the microstructures of fine-grained sediments and its evolution mechanism of Carboniferous-Permian coal-bearing succession by adopting modern test analysis, fine sedimentary fine layer portrayed and micro quantitative characterization, optimal log interpretation and other methods and technologies, Integrateall parameter of fine-grained sediments in coal series into an aggregation of multidimensional geological information. This research first analysis coal fine-grain sedimentary types, micro-sequence cycles, micro-facies types and their combination sequence; Then according to the characteristics of coal fine-grained sedimentary transformation conditions and process, peat and the plant debris inject law, organic substance abundance, sedimentary structure, and small hydrodynamic interface and other studies, the relationship of fine-grain deposition, organic matter evolution, and gathered of coupling will deeply investigated and microstructures model of coal fine-grain sediment will be established.Finally, coal fine-grain sediment dynamics mechanism and characteristics of water system will be studied in order to establish genetic models of fine-grain sediments of different structure types. This study will closely integrate the tectonic-subsidence-sedimentary filling dynamics characteristics of coal-accumulation basin evolution and peat accumulation process, which reveal the sediment dynamics during fine-grained sediment sand peat accumulation coupling process.

本项目拟选择鲁西及邻区石炭—二叠纪煤系细粒沉积岩为研究对象，运用沉积学、储层地质学、煤地质学、高分辨率层序地层学等多学科交叉的方法和思路，采用现代测试分析、精细沉积细层刻画与微观定量表征、最优化测井解释等方法和技术，将煤系中细粒沉积的所有参数综合成一个多维地质信息集合体，进行煤系细粒沉积的微细结构及其演化机制研究。本研究首先分析煤系细粒沉积类型、微序列旋回、微相类型及其组合序列；在此基础上，根据煤系细粒沉积转化条件与过程特点，泥炭及植物碎屑注入规律、含有机质丰度、沉积构造以及小型水动力学界面等研究，深入探究细粒沉积与有机质演化、聚集的耦合关系，建立煤系细粒沉积的微细结构模型。最后，研究煤系细粒沉积的动力学机制与水域体制特点，建立不同结构类型细粒沉积的成因模式。本研究紧密结合聚煤盆地演化与泥炭堆积过程中的构造—沉降—沉积充填动力学特点，揭示细粒沉积与泥炭聚集耦合作用过程中的沉积动力学机制。

随着国家逐步调整能源战略结构，页岩气相关研究意义凸显。本次工作主要针对陆相及海陆过渡相沉积环境中泥页岩沉积特征和演化开展。煤与油页岩在勘探实践、尤其在山东煤区的页岩气资源勘查发现成藏机制上的相似性。本项目选择山东煤系地层细粒沉积物为研究对象，探究细粒沉积物的结构特征、成岩机理上，并于海相细粒沉积对比，分析煤与油页岩共生成矿基础。.为探究煤与泥质岩的关系、泥质岩与细粒沉积岩的划分界线，海陆交互相微细沉积储层的岩性特征，开展了如下工作：收集了山东省煤区泥岩资料，分析山东省煤系泥岩发育情况；煤系细粒沉积现场观测、典型井岩心取样和化验分析；将山东石炭二叠系海陆交互相煤系细粒沉积与海相碳酸盐岩细粒沉积进行对比分析等。通过这些工作，认识到山东煤区细粒沉积物结构特征，建立了细粒沉积微细纹层评价系统。.山东省构造运动多样，沉积环境复杂，东西部发育地层和构造特征有巨大差异。山东富有机质岩系主要分布在上古生界海陆交互相含煤盆地、中生代陆相盆地、新生代湖相和河湖相盆地中。其中鲁西、鲁西南煤区的古生代石炭－二叠纪月门沟群太原组、山西组海陆交互相细粒沉积是发育页岩气的有利层段，有发现清洁能源的物质基础。针对不同盆地细粒沉积序列的特点，对比海相细粒沉积和海陆交互相细粒沉积的特点和不同结构特征，逐一进行细粒沉积体系及其相、微细纹层鉴别、划分、测量等数据的采集、分析与全面对比，从纹层结构出发，结合储层有机质特征，追溯沉积环境。将纹层厚度、纹层属性、有机质纹层及纹层空间分布等定量参数统一在一个框架下，建立之间的相关关系，形成细粒沉积微细纹层评价系统。.项目共计发表学术论文6篇，其中SCI收录3篇。获得山东省国土资源科技进步一等奖1项、三等奖1项。