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hydrocarbon accumulation characteristics of beachbar sandstones in the southern slope of the Dongying Sag, Jiyang Depression, Bohai Bay Basin, China

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Petroleum Science 2014年第2期11卷 220-233页

作者： Guo Song Tan Lijuan Lin Chengyan Li Hongnan Lü Xiuxiang Wang Hongtao College of Geoscience China University of Petroleum State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum School of Geoscience China University of Petroleum Exploration and Development Research Institute Huabei Oilfield of CNPC

A number of beach-bar sandstone reservoir beds are developed in the upper fourth member of the Eocene Shahejie Formation （Es4s） on the southern slope of the Dongying *** on the analysis of seismic and logging data,with characterization and petrographic studies of core and cutting samples,this paper analyzes the hydrocarbon accumulation characteristics in two typical blocks of the Boxing and Wangjiagang oilfields,especially reservoir bed heterogeneity and migration conditions that influence oil and gas distribution,calculates the index of reservoir bed quality （IRQ） with a mathematical method,and discusses the relationship between driving force and resistance of hydrocarbon *** into account the characteristics of thin interbeds in beach-bar sandstones,an experimental model simulated the characteristics of hydrocarbon migration and accumulation in thin interbedded sandstones with reservoir bed *** results showed that hydrocarbon distribution and properties were extremely *** bed and migration conditions controlled hydrocarbon accumulation in beach-bar *** is above 0.4 in the main hydrocarbon *** body distribution,structural configuration and fault systems controlled the direction of regional migration and location of hydrocarbon *** experiments indicated that the change of driving force for hydrocarbon migration affected selective accumulation *** moved vertically along fault zones to the reservoir and resulted in the distribution of hydrocarbon in the *** kinds of hydrocarbon accumulation models exist in the study *** is a hydrocarbon accumulation model controlled by reservoir bed heterogeneity and the second is a hydrocarbon accumulation model controlled by a complex migration system with faults connecting ***,different exploration strategies should be adopted for the detailed exploration for beach-bar sandstone reservoirs acc

关键词： Dongying Sag beach-bar sandstone hydrocarbon accumulation characteristics playelements model experiment

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Exploration discovery and hydrocarbon accumulation characteristics of the Doseo strike-slip and inverted basin, Chad

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Petroleum Exploration and Development 2022年第2期49卷 247-256页

作者： DOU Lirong XIAO Kunye DU Yebo WANG Li ZHANG Xinshun CHENG Dingsheng HU Ying Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China China National Oil and Gas Exploration and Development Corporation Beijing 100034China

Several international oil companies had conducted petroleum exploration, but failed to make any commercially viable discoveries in the Doseo Basin for over 30 years. In this article, an integrated analysis, based on the latest seismic and drilling data combined with exploration practice and tectonic, sedimentary as well as petroleum-geological characteristics of the basin, has been conducted with the aim to disclose the key factors of hydrocarbon accumulation and enrichment and then to find the potential petroleum plays. The Doseo Basin in Chad is a Meso-Cenozoic lacustrine rift basin developed on the Precambrian crystalline basement in the Central African Shear Zone. It is a half graben rift controlled by the strike-slip fault at the northern boundary, and can be divided into two sub-basins, an uplift and a slope. The basin experienced two rifting periods in the Cretaceous and was strongly inverted with the erosion thickness of 800–1000 m during the Eocene, and then entered the depression and extinction period. Structurally, a large number of normal faults and strike-slip faults are identified in the basin, and the boundary faults are inverted faults with normal at first. The main structural styles include inverted anticlines, fault noses, complex fault-blocks and flower structures. The Lower Cretaceous is the main sedimentary strata, which are divided into the Mangara Group, Kedeni, Doba and Koumra Formations from bottom to up. Two transgressive-regressive cycles developed in the Lower Cretaceous indicates with mainly lacustrine, fluvial, delta, braided-delta, fan-delta sandstone and mudstone. The effective source rock in the basin is the deep-lacustrine mudstone of the Lower Cretaceous containing the type Ⅰ and type Ⅱ;organic matters. Furthermore, Inverted anticlines and fault-complicated blocks comprise the main trap types and the Kedeni Uplift is the most favorable play, followed by the Northern Steep Slope and Southern Gentle Slope. Lateral sealing capacity of

关键词： Doseo Basin rift basin strike-slip inverted structure petroleum system hydrocarbon accumulation characteristics exploration discovery

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