Re-exploration program for petroleum-rich sags and its significance in Bohai Bay Basin, East China

Zhao, Xianzheng; Wang, Quan; Jin, Fu; Luo, Ning; Bingda, Fan; Li, Xin; Qin, Fengqi; Zhang, Hongwei

doi:10.1016/s1876-3804(15)30075-6

Cited by 22 publications

(8 citation statements)

References 8 publications

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“…1). The basin contains seven depressions, which are the Liaohe, Jizhong, Huanghua, Jiyang, Linqing, Bozhong, and Liaodong Bay depressions (Teng et al, 2014;Zhao et al, 2015). The Paleogene Bohai Bay Basin was formed in a fault depression period when lacustrine sediments were frequently deposited in low-lying areas throughout the Basin.…”

Section: Geologic Settingsmentioning

confidence: 99%

Characteristics and Controlling Factors of Shale Oil Reservoir Spaces in the Bohai Bay Basin

Deng

Chen

et al. 2020

Acta Geologica Sinica (Eng)

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The Cenozoic continental strata of the Bohai Bay Basin are rich in shale oil resources, and they contain various types of reservoir spaces that are controlled by complex factors. Using field emission scanning electron microscopy (FE-SEM), automatic mineral identification and characterization system (AMICS), CO 2 and N 2 gas adsorption, and focused ion beam scanning electron microscopy (FIB-SEM), the types of shale reservoir spaces in the Bohai Bay Basin are summarized, the spatial distribution and connectivity of the various types of pores are described in detail, the microscopic pore structures are characterized, and the key geological mechanisms affecting the formation and evolution of the reservoir spaces are determined. Three conclusions can be drawn in the present study. First, the shale reservoir spaces in the Bohai Bay Basin can be divided into three broad categories, including mineral matrix pores, organic matter pores, and micro fractures. Those spaces can be subdivided into seven categories and fourteen sub-categories based on the distribution and formation mechanisms of the pores. Second, the complex pore-throat structures of the shale reservoir can be divided into two types based on the shape of the adsorption hysteresis loop. The pore structures mainly include wedge-shaped, flat slit-shaped, and ink bottle-shaped pores. The mesopores and micropores are the main contributors to pore volume and specific surface area, respectively. The macropores provide a portion of the pore volume, but they do not significantly contribute to the specific surface area. Third, the factors controlling the development of microscopic pores in the shale are complex. The sedimentary environment determines the composition and structure of the shale and provides the material basis for pore development. Diagenesis controls the types and characteristics of the pores. In addition, the thermal evolution of the organic matter is closely related to inorganic diagenesis and drives the formation and evolution of the pores.

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Section: Geologic Settingsmentioning

confidence: 99%

Characteristics and Controlling Factors of Shale Oil Reservoir Spaces in the Bohai Bay Basin

Deng

Chen

et al. 2020

Acta Geologica Sinica (Eng)

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“…The Nanpu Sag has already come under the spotlight in recent years due to the discovery in 2014 of significant oil and gas pools with 0.55 million tons crude oil equivalent (Chen et al, 2016). The geochemical analysis of potential oil-sources indicates that a large amount of the oil and gas was derived from the source rocks of Ed 3 strata (Wang et al, 2008;Xu et al, 2008;Zhao et al, 2015). The source rocks of Es 1 and Es 3 are widely developed across the Bohai Bay Basin, while the Ed 3 source rock is only found in the Nanpu Sag (Yang and Li, 2012).…”

Section: Petroleum Geology Significancementioning

confidence: 99%

“…The Paleocene Kongdian Formation (Ek) and the Eocene Member 4 of the Shahejie Formation are absent within the Nanpu Sag (Figure 3). The Shahejie (Es) Formation contains the main source rocks and consists of three lithostratigraphic members, from top to bottom, Es 1 , Es 2 , and Es 3 , and the lower member, Es 3 , is further divided into five sub-members including Es 3 1 , Es 3 2 , Es 3 3 , Es 3 4 , Es 3 5 (Dong, 2002; Zhou et al., 2000) and the lithologic description of each member is provided in Figure 3 (Jiang et al., 2009; Wang et al., 2002a). The Dongying (Ed) Formation is the most prospective for hydrocarbons and can be divided into three members from top to bottom; Ed 1 , Ed 2 , and Ed 3 , which together constitute a complete depositional sequence.…”

Section: Geological Settingmentioning

confidence: 99%

“…The Dongying Formation of the fourth episode in the syn-rift stage shows a high potential of hydrocarbon in the Nanpu Sag (Cong and Zhou, 1998; Li et al., 1997; Tourba et al., 2005, 2006). Multitude studies document a systematic tectonic analysis including structures, tectonic evolution, and geodynamic processes (Liu et al., 2006, 2007; Xu et al., 2004; Zhou et al., 2000, 2004). With a close relation to the tectonic activities including fault activity and basement subsidence, numerous investigation focused on the sedimentary infill and spatial distribution that are controlled by dynamic tectonic and sedimentation in the Paleogene of the Nanpu Sag, Bohai Bay Basin (Dong et al., 2014; Chen et al., 2016; Cong and Zhou 1998; Zhang et al., 2009).…”

Section: Introductionmentioning

confidence: 99%

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The Paleogene multi-phase tectono-sedimentary evolution of the syn-rift stage in the Nanpu Sag, Bohai Bay Basin, East China

Jin

Wang

Chen³

2018

Energy Exploration & Exploitation

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The Bohai Bay Basin is the second largest oil-producing basin in China located on the east Asian margin. The Bohai Bay Basin contains numerous depressions, sub-basins, and sags. One of these, the Nanpu Sag, has played a particularly important role in oil and gas exploration in recent years. Four depositional systems are recognized in the Nanpu Sag, fan-delta, braided-river delta, turbidite deposits, and lacustrine systems. In the Paleogene, the Nanpu Sag underwent complex and multi-phased rifting evolution. Two evolutionary phases have been identified: the syn-rift phase and the post-rift phase, the syn-rift stage can be further subdivided into four episodes. This study reveals the considerable faulting activity and associated strong subsidence that occurred during the deposition of the Dongying Formation in the fourth episode of the syn-rift stage. The depositional systems and the tectonic activity during the fourth episode in the Nanpu Sag have very different characteristics compared to those of other depressions or sub-basins in the Bohai Bay Basin. Boundary fault activity was extremely intense during the deposition of the Dongying Formation, especially the east to west trending faults, including the Xinanzhuang Fault and the Gaoliu Fault. Moreover, the migration of subsidence centers from the Shahejie Formation to the

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“…The primary task of large scale development of low permeability reservoirs is comprehensive evaluation on reservoirs to determine the characteristics of advantageous reservoirs. Zhao et al and Wenhui et al carried out a comprehensive evaluation on reservoirs by using the seismic technique to predict lithology, sand bodies, physical properties, and hydrocarbon potential [3,4]. Zhengming et al and Zhonghong et al evaluated low permeability reservoir comprehensively by selecting abundance, effective thickness, throat radius, volume percentage of mobile fluid, start-up pressure gradient, and effective driving factors based on the characteristics of low permeability reservoirs [5], and then, based on optimization, they established a comprehensive reservoir evaluation method for low permeability oil regions by selecting five parameters, namely, throat radius, volume percentage of mobile fluid, start-up pressure gradient, clay content, and crude oil viscosity [6].…”

Section: Introductionmentioning

confidence: 99%

Advantageous Reservoir Characterization Technology in Extra Low Permeability Oil Reservoirs

Luo

Yang

Meng³

et al. 2017

Journal of Engineering

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This paper took extra low permeability reservoirs in Dagang Liujianfang Oilfield as an example and analyzed different types of microscopic pore structures by SEM, casting thin sections fluorescence microscope, and so on. With adoption of rate-controlled mercury penetration, NMR, and some other advanced techniques, based on evaluation parameters, namely, throat radius, volume percentage of mobile fluid, start-up pressure gradient, and clay content, the classification and assessment method of extra low permeability reservoirs was improved and the parameter boundaries of the advantageous reservoirs were established. The physical properties of reservoirs with different depth are different. Clay mineral variation range is 7.0%, and throat radius variation range is 1.81 m, and start pressure gradient range is 0.23 MPa/m, and movable fluid percentage change range is 17.4%. The class IV reservoirs account for 9.56%, class II reservoirs account for 12.16%, and class III reservoirs account for 78.29%. According to the comparison of different development methods, class II reservoir is most suitable for waterflooding development, and class IV reservoir is most suitable for gas injection development. Taking into account the gas injection in the upper section of the reservoir, the next section of water injection development will achieve the best results.

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Re-exploration program for petroleum-rich sags and its significance in Bohai Bay Basin, East China

Cited by 22 publications

References 8 publications

Characteristics and Controlling Factors of Shale Oil Reservoir Spaces in the Bohai Bay Basin

Characteristics and Controlling Factors of Shale Oil Reservoir Spaces in the Bohai Bay Basin

The Paleogene multi-phase tectono-sedimentary evolution of the syn-rift stage in the Nanpu Sag, Bohai Bay Basin, East China

Advantageous Reservoir Characterization Technology in Extra Low Permeability Oil Reservoirs

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