LOW PERMEABLE SANDSTONE RESERVOIR CHARACTERISTICS AND DIAGENESIS OF CHANG 6,CHANG 7 AND CHANG 8 FORMATION OF THE YANCHANG FORMATION(TRIASSIC),SHANCHENG-YANWU AREA,ORDOS BASIN
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- 鄂尔多斯盆地山城-演武地区三叠系延长组长6-长8低渗储层特征及成岩作用研究