西北地质Issue(2)：115-125,11.
歧口凹陷马东东地区沙一段下部沉积微相研究
Study on Sedimentary Facies of the Lower Member in the First Submember of the Shahejie Formation in Madongdong Area of Qikou Sag
摘要
Abstract
Based on core observation, the origins of the lower member in the first submember of the Shahejie formation in Madongdong area of Qikou sag are analyzed by using the data including rock types and their combinations, sedimentary structures, grain size, the results of seismic and logging, and reservoir properties. The reservoir in this area represents gravity flow deposits in the deep lake environment. Deposits consist of channel, overflow, interchannel and lake mud deposits. Gravity flow channel sediments in the study area mainly come from north east area. Channel position overall does not change too much. Gravity flow deposits show band distribution and the thicker sand bodys located near Well Gs24-26 area and Madongnan area. Overall, channel facies are most widely distributed in the Bin I oil group, and bifurcated more. In the Ban Ⅱ ,Ⅲand Ⅳ oil group, gravity flow channels are mainly joined by channel downstream. There is close correspondence between microfacies types and thickness of sandstone, and the thicker sand body, the greater porosity. Waterways microfacies have the best reservoir properties, and is the most favorable oil and gas-rich facies unit.关键词
歧口凹陷/沙河街组/相标志/沉积微相/重力流沉积Key words
Qikou sag/ Shahejie Formation/facies mark/sedimentary microfacies/ gravity flow deposits分类
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王少军,王翊超,林孝先,王春连..歧口凹陷马东东地区沙一段下部沉积微相研究[J].西北地质,2012,(2):115-125,11.基金项目
中石油大港油田勘探开发研究院“马东东地区层序地层学与储层特征研究”(DGYT-2006-JS-4037) （DGYT-2006-JS-4037）
