吴起油田40-6井区长6沉积特征研究

Study on Sedimentary Characteristics of Chang 6 in Well 40-6 of Wuqi Oilfield

鄂尔多斯盆地吴起地区油气资源丰富,勘探潜力很大。以吴起油田主力勘探层长6油层组为研究对象,结合岩心、测井分析化验、测试等资料,综合运用地层学、沉积学、储层地质学、测井地质学等理论和方法,进行地层划分、沉积相类型识别、沉积相带与砂体展布、储层物性等方面研究,为油气藏的勘探开发提供重要的地质依据。研究发现,本研究区属于三角洲前缘亚相,发育水下分流河道、河口坝、分流间湾微相,根据岩性特征、旋回特征、测井曲线特征划分沉积微相。研究区河道主要呈北东-南西方向展布,河道发育较稳定,砂体基本呈带状分布。

The Wuqi area of Ordos basin,which posses abundant resources,has bright prospect in oil and gas exploration.The article takes the change6 in Wuqi oilfield as the object of study.By collecting data about out crop core,logging,analysis and test,at the same time using sedimentary analysis and geological analysis,in the thesis,sequence division is applied.Types of sedimentary facies are identified,the extension of sand bodies,distribution of sedimentary facies of Chang6 oil-bearing beds of Yanchang6 Formation in Wuqi are realized by there search above.These characteristics,to find out the favorable target horizon reservoir of exploration and development of oil and gas reservoirs,provide important geological basis.Researches show that this area belongs to Delta Front,underwater distributary channel,mouth bars,inter distributary are the major sediment microfacies,and according to the rock types,sedimentary cyclical characteristic and well logging data,classify sedimentary microfacies.The river channel direction of Wuqi oilfield is northeast-southwest.The channel develops steady and sand body is distributed banding.