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鄂尔多斯盆地延长组深水致密砂岩大气淡水溶蚀及其油气地质意义
The meteoritic dissolution in the deep water tight sandstone in the 6th and 7th member of Yanchang formation and its geological significance
刘曦翔1, 2 张 宇3 蒲柏宇1 徐会林4 丁晓琪5
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作者单位:1. 中国石油西南油气田公司勘探开发研究院 2. 西南石油大学 3. 中国石油西南油田公司勘探事业部 4. 中国石油西南油气田公司蜀南气矿 5. 成都理工大学能源学院
中文关键字:鄂尔多斯盆地 晚三叠世 重力流 致密砂岩 淡水溶蚀 成因与意义
英文关键字:Ordos basin; Yanchang formation; gravity flow; tight sandstone; meteoritic dissolution
中文摘要:鄂尔多斯盆地南部三叠系长6-7 段深水重力流砂岩毗邻烃源岩,前人普遍认为沉积时期大气淡水难以进入,沉积后又无表生暴露,其中发育的溶蚀孔隙是在有机酸作用下形成的。但是在该深湖致密砂岩沉积中发现大量的溶蚀孔隙,很难用传统有机酸溶蚀理论解释。通过薄片观察、CT 扫描、恒速压汞等手段进行孔隙结构识别,并利用阴极发光观察、地球化学分析结合区域地质背景资料综合判断,结果表明:①研究区中除了成岩晚期的有机酸溶蚀外,还发育早期大气淡水溶蚀;②早期淡水溶蚀孔隙主要表现为高岭石含量较低,孔隙结构较差,喉道半径小,束缚水含量较高等特点;③早期溶蚀孔的形成,改善了成岩晚期酸性溶液在岩石中的渗流条件,从而提高了酸性溶液的溶蚀效率,可对早期孔隙溶蚀扩大和产生新的溶蚀孔隙。结论认为:在深湖环境中受重力流事件的影响,淡水也能大量进入湖盆,深湖沉积物中也可能形成大面积的早期淡水溶蚀,如果这些孔隙得以保存,则能够在这种深水砂岩中形成良好的储层。
英文摘要:For the deep water sandstone in the 6th and 7th member of Yanchang formation,Triassic in Ordos basin, as its deep lacustrine environment, lack of supergene karst and location adjoins source rock , the former experts universally recognized that dissolution porosity are formed by organic acid. However, newest study meteoritic water could flow into the deep lacustrine under certain conditions and it is hard to explain the abounding dissolution porosity explored in target area by referring to organic acid. Meanwhile, the foundation of searching sweet spot in tight sandstone is the understanding of the origin of the dissolution porosity. The paper on the one hand applies the means of thin section observation, CT scaning, rate-controlled mercury penetration technique to analyze the difference in pore structure. On the other hand, combining with geological setting, the following conclusions are drawn according to cathode luminescence observation and geochemical analysis: 1) In study area, apart from dissolution of organic acid, dissolution of meteoritic water are developed besides . As a result, the areas with different reservoirs should exploit in different ways; 2) Being affected by gravity flow event in deep water environment, the meteoritic water could be invade into the lacustrine , forming extensive
dissolution pore. If the dissolution pore was protected ,the sweet spot will be developed.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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