Accumulation of unconventional petroleum resources and their coexistence characteristics in Chang7 shale formations of Ordos Basin in central China

作     者：Jingwei CUI Rukai ZHU Zhiguo MAO Shixiang LI 

作者机构：Research Institute of Petroleum Exploration and DevelopmentPetroChinaBeijing 100083China Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary MineralShandong University of Science and TechnologyQingdao 266590China Changqing Oilfield Research Institute of Petroleum Exploration and DevelopmentCNPCXi’an 710018China 

出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)

年 卷 期：2019年第13卷第3期

页      面：575-587页

核心收录：

学科分类：07[理学] 

基　　金：国家973计划 

主　　题：shale formation oil and gas resources orderly accumulation and coexistence integrated exploration and development 

摘      要：The Ordos Basin is the largest oil and gas producing basin in China, where tight oil, shale gas, oil shale, and other unconventional oil and gas resources have been found in the Chang7 subsection of the Triassic Yanchang Formation. However, the mechanism of formation and the distribution of unconventional oil and gas resources in the shale layers have not been systematically investigated until now. According to the type of unconventional oil and gas resources, main controlling factors, and the maturity, depth and abundance of organic matters, the shale oil and gas resources from Chang7 region are divided into five zones that include an outcrop-shallow oil shale zone, a middle-matured and medium-burial shale oil zone, a medium-matured and medium-burial in situ conversion process (ICP) shale oil zone, a high-maturity and deep-burial shale gas zone, and an adjacent-interbedded tight sandstone oil zone. By the distribution of resources, orderly evolution of oil and gas resources and coexistences in lacustrine shale formations have been put forward, and also a strategy of integrated exploration and development of resources in the shale formations is proposed. Overall, the outcome of this study may guide on the effective utilization of unconventional oil and gas resources in other shale formations.