页岩气藏地质特征及地质选区评价方法——以辽河坳陷东部凸起为例

Shale gas reservoir characteristics and geological evaluation of prospective areas:A case study with the Eastern Uplift of Liaohe depression

以辽河坳陷东部凸起为例,分析了其构造特征及沉积环境,认为东部凸起上古生界山西组、太原组存在1套良好的高成熟度、高有机质丰度的烃源岩。通过对山西组、太原组泥页岩的分析,认为有机碳含量、演化程度、单层厚度、硅质含量、含气量、渗透率是页岩气地质选区的6个基本参数,初步确立了页岩气有利区地质评价方法,有助于推动页岩气勘探开发和产业化的发展。

The Eastern Uplift of Liaohe depression has been studied for tectonics and sedimentary environment.It is believed that there is a set of hydrocarbon source rocks of high maturity and high organic abundance in the Neopaleozoic Shanxi and Taiyuan formations of the Eastern Uplift.It is concluded through analysis of the shale in the Shanxi and Taiyuan formation that organic carbon content,evolution degree,single layer thickness,siliceous content,gas content and permeability constitute 6 basic parameters for screening prospective areas of shale gas,thus established a preliminary method of geological evaluation of favorable shale gas areas,which would help promote shale gas exploration,development and industrialization.