美国福特沃斯盆地Barnett页岩气藏特征及开发技术特点

Fort Worth basin Barnett shale gas reservoir characteristics and development technical characteristics

本文分析了得克萨斯州沃斯堡盆地密西西比Barnett页岩的岩性特征、孔渗特征、有机质类型及成熟度、含气丰度和资源潜力,以及这一世界级的非常规天然气藏的开技术特点。Barnett页岩气藏地层岩性复杂,渗透率很低,需人工增产措施才能生产,富含有机质,现今的有机碳总量>3.0%,热成熟度较高,镜质体反射率>1.1%,蕴藏巨大的资源潜力。美国地质调查局的评估福特沃斯(FortWorth)盆地未发现的技术可采储量为26.2万亿立方英尺。盆地内页岩气开采主要采用重复压裂、清水压裂、水平井开发等技术,且同步压裂技术也逐步在页岩气开发中推广。

It is introduced that the Mississippian Barnett Shale serves as to a world-class unconventional natural-gas accumulation in the Fort Worth basin of Texas in this article. The formation is alitholo -gically complex interval of low permeability that require sartificial stimulation to produce. The Barnett Shale is relatively thick C〉 92 m）,organic rich （present day total organic carbon ：〉 3. 0~）,thermally mature （vitrinite reflectanee~,l. 1~）. Recent assessment by the U.s. Geological Survey suggests a mean volume of 26.2 tcf of undiscovered,technically recoverable gas in the central FortWorth basin. Restimulation,water-based stimulations and horizontal drilling have being applied in the course of shale gas development.