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基于黔西地区晚二叠世含煤地层的实测资料,初步探讨了“多层叠置独立含煤层气系统”形成的沉积控制因素.研究表明,含煤地层的沉积条件奠定了“多层叠置独立含煤层气系统”的物质及物性基础,层序地层格架特点限定了含气单元间含气性的连通性.最大海泛面附近的菱铁质泥岩等低渗透岩层控制了垂向次级含气单元间的含气性相对独立,且煤层含气量与海平面升降之间存在一定的相关性,即最大海侵面附近煤层含气量相对较低,此界面似乎可作为含煤层气系统内独立含气单元的成藏边界;层序界面沟通了含气单元间的含气联系,使得靠近层序界面附近的煤层具有相似的含气性特征.
Based on the measured data of Late Permian coal-bearing strata in Qianxi area, the sedimentary control factors formed by “multi-layered independent CBM system ” are discussed preliminarily. The stratigraphic characteristics of sequence stratigraphy define the connectivity of gas-bearing units between gas-bearing units. Low permeable rock formations such as siderite mudstone near the maximum oceanic surface control There is a certain correlation between gas content of coal seam and sea level rise and fall, that is, the gas content of coal seam near the maximum sea-surface is relatively low, and this interface seems to be able to be used as a gas- The boundary of gas accumulation between the gas-bearing units is communicated by the sequence interface, so that the coal seams near the interface of the sequence sequence have similar gas-bearing characteristics.