摘要:
鄂尔多斯盆地靖边奥陶系马五4段为该区天然气主力产层之一,对其储层地质特征的详细研究对进一步勘探与开发具有重要的意义。以鄂尔多斯盆地靖边气田西部马五4段为研究对象,在总结前人研究的基础上,综合应用岩心、测录井以及分析化验资料,以沉积岩石学理论为指导,以单因素分析多因素综合作图法为方法论,进行沉积相类型识别、沉积相平面展布及演化等研究。认为马五4段沉积环境为一个气候干热、海平面低、海水咸化、经常暴露的低能沉积环境,即局限台地相沉积,可进一步分为云坪、灰云坪、含膏云坪、膏云坪、泥云坪5个微相。且从马五34期至马五14期海平面相对上升,各沉积微相和亚相也呈有规律性的变化。
Abstract:
The Odors Basin is one of the major hydrocarbon-bearing basins in China with the Ordovician carbonate rocks as the major gas reservoir. The Member Ma54 of the Ordovician is a main producing reservoir in the west Jingbian Gas Field of the Basin. As a carbonate dominated reservoir, it is critical to study the reservoir properties for better exploration and development. This paper is devoted to the sedimentary facies of the Ma54 member of the west Jingbian Gas Field on the basis of previous studies and the comprehensively use of the present materials including drilling cores,logging and testing data, and the mapping method upon single factor analysis and multifactor analysis. Types of sedimentary facies and their distribution pattern are carefully studied. The Ma54 was deposited in a low energy environment of a restricted platform under a dry and hot climate and the sea level was low then. The platform was even exposed to air sometimes. It can be further classified into five microphases:dolomitic flat, gypsum dolomite flat, gypsum-bearing dolomite flat, gypsum dolomite flat and pelitic dolomite flat. There was shifting of microfacies and subfacies from Ma53 4 to Ma154 while the sea level rose relatively.
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