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Distribution of shallow water delta sand bodies and the genesis of thick layer sand bodies of the Triassic Yanchang Formation, Longdong Area, Ordos Basin

引用

Petroleum Exploration and Development 2021年第1期48卷 123-135页

作者： LIU Hanlin QIU Zhen XU Liming WANG Fengqin TONG Qiang LIN Jiahao YIN Shuai WANG Wenqiang PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China School of Earth and Space Sciences Peking UniversityBeijing 100871China PetroChina Changqing Oilfield Company Xi’an 710021China College of Geosciences and Engineering Xi’an Shiyou UniversityXi’an 710065China State Key Laboratory of Continental Dynamics/Department of Geology Northwest UniversityXi'an 710069China No.3 Gas Production Plant PetroChina Changqing Oilfield CompanyWushenqi 017300China State Key Laboratory of Petroleum Resources and Prospecting College of GeosciencesChina University of Petroleum(Beijing)Beijing 102249China

Based on the cores from 47 wells and logging data of 130 wells,the main types of sand bodies in the shallow water delta of the Chang 8_(2) sub-member in the Triassic Yanchang Formation,Longdong Area,Ordos Basin were comprehensively analyzed,the distribution characteristics of sand bodies more than 20 m thick were identified,and the genetic types of the thick sand bodies were sorted *** this region,thick-bed sand bodies can be divided into two types according to the shape and position:type 1 is the sand body in wide strip and is distributed between the average high water mark and the average low water mark;type 2 is distributed on both sides of the average low water mark and is in irregular lump *** on the principle of the volume distribution of sediments and the change rule of accommodation space,the genetic models of two types of thick-bed sand bodies in the Chang 8_(2) sub-member are superimposed distributary channel sand bodies in high accommodation space and superimposed composite sand bodies in low accommodation space.

关键词： Ordos Basin Longdong area shallow delta sand body distribution sand body genetic type Triassic Yanchang Formation Chang 8_(2)sub-member

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