陕北大牛地气田马五段古岩溶储层特征及控制因素

发布时间：2018-11-07 21:48

【摘要】：大牛地气田位于鄂尔多斯盆地中东部,面积约0.34万平方公里,该区域下古生界岩溶风化壳储层(马家沟组马五1-马五5亚段)是本文研究的重点内容。本文是在地质背景、岩心、薄片、测井、毛管压力曲线等资料分析的基础上,结合前人研究成果,对大牛地气田奥陶系马家沟组古岩溶储层特征及控制因素进行分析研究。通过分析储层的岩石学特征、孔隙结构特征、物性特征及储层的分布规律得出研究区古岩溶储层的主要岩石类型为岩溶角砾岩和微-粉晶白云岩,灰岩次之,把研究区孔隙结构类型主要分为四类,比较分析得出大牛地气田孔隙度与渗透率相关性较差;分别应用印模法、残余厚度对古岩溶地貌进行恢复,比较其优劣,最后通过综合分析法对古岩溶地貌进行恢复,划分出古岩溶地貌单元。具体分析大牛地储层特征、成岩环境、成岩作用、构造作用及沉积相对古岩溶储层的影响,最后得出研究区储层发育的有利区域为:大48—大38井区,大88—大29—大84井区,大40—大41—大42井区。
[Abstract]:Daniudi gas field is located in the central and eastern part of Ordos Basin with an area of about 3400 square kilometers. The lower Paleozoic karst weathering crust reservoir (Mawu1-Ma Wu 5 submember of Majiagou formation) is the focus of this paper. Based on the analysis of geological background, core, thin slice, logging, capillary pressure curve and other data, the characteristics and controlling factors of paleokarst reservoir of Ordovician Majiagou formation in Daniudi gas field are analyzed and studied in this paper. The main rock types of paleokarst reservoir in the study area are karst breccia and micro-powdery dolomite, followed by limestone, by analyzing the petrological characteristics, pore structure, physical properties and reservoir distribution of the reservoir. The types of pore structure in the study area are divided into four types, and the correlation between porosity and permeability in Daniudi gas field is poor. The paleokarst geomorphology is restored by the impression method and the residual thickness, and the advantages and disadvantages are compared. Finally, the paleokarst geomorphology is restored by the comprehensive analysis method, and the paleokarst geomorphology unit is divided. The reservoir characteristics, diagenetic environment, diagenesis, tectonism and the effect of sedimentation on paleokarst reservoir are analyzed in detail. Finally, it is concluded that the favorable areas for reservoir development in the study area are as follows: Da-48- Da-38 well area, Da-88-Da 29-Da-84 well area. Big 40-big 41-big 42 well area.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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