鄂尔多斯盆地上三叠统延长组砂岩回弹及其对成藏的作用  

Sandstone Rebound and Its Impact on Reservoir-Forming in Upper Triassic Yanchang Formation of Ordos Basin

作　　者：王秀娟 李元昊[2,3] 

机构地区：[1]中国石油长庆油田分公司油藏评价处 [2]中国石油长庆油田分公司勘探开发研究院 [3]低渗透油气田勘探开发国家工程实验室

出　　处：《低渗透油气田》2013年第1期41-44,共4页

摘　　要：鄂尔多斯盆地在早白垩世末期发生了区域性大规模构造抬升剥蚀作用，抬升剥蚀东强西弱，剥蚀量一般为600—1400m，最大超过1600m。通过对志丹地区长10油藏的解剖分析，该区早白垩世未大规模的抬升剥蚀构造背景为砂岩回弹创造了条件，同时，长10砂岩厚度大，成岩作用相对较弱，具备明显的回弹能力，在薄片岩心等资料上发现了砂岩回弹的直接证据——回弹微裂缝。砂岩回弹作用不仅改善了局部储层物性，同时形成的负压促进了石油向下运移成藏。A large-scale regional tectonic uplifting and erosion occurred in the end of Early Cretaceous in Ordos Basin; the uplift and erosion were strong in the east and weak in the west. The denudation is generally 600 ~ 1400m, up to 1600m. Through analysis of Changl0 reservoirs in Zhidan area, in the end of Early Cretaceous, the massive tectonic setting of uplift and erosion of the region created conditions for the sandstone resilience; at the same time, the sandstone of Chang10 reservoirs with large thickness and relatively weak diagenesis has obvious resilience （rebound ability）. The direct evidence - resilience micro fractures has been found in the data of thin sections （flakes） and cores. The sandstone resilience effect not only improves the local reservoir properties, while the formed negative pressure promotes the downward oil migration and accumulation into reservoir-forming.

关 键 词：鄂尔多斯盆地 延长组 长10油层组 砂岩回弹 

分 类 号：P618.130.2[天文地球—矿床学]