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Yang H.,Petrochina | Yang H.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil Gas Fields | Fu J.,Petrochina | Fu J.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil Gas Fields | And 4 more authors.
Shiyou Xuebao/Acta Petrolei Sinica | Year: 2011

Based on a study of the Ordovician in the Ordos Basin, such as sedimentary characteristics, conditions of source rocks, types of reservoirs and major controlling factors of hydrocarbon accumulations and traps, we could identify four provinces in Ordovician carbonates, i.e. gas reservoirs in the weathering crust of the middle and eastern basin, dolostones distributed around the Caledonian paleo-uplift, platform margin belts and the pre-salt of the eastern basin. Integrated with new advances in the gas exploration of this basin, gas reservoirs in the weathering crust were selected as preferred targets for the next gas exploration. Meanwhile, various effective reservoirs developed in dolostones circumjacent to the paleo-uplift, platform margin belts and the Ordovician pre-salt in the eastern basin were thought a great potential to serve as successive domains for the future gas exploration. This study is of great importance in guiding gas exploration in Ordovician marine carbonates of the Ordos Basin. Source


Zhang Z.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil Gas Fields | Zhang Z.,Petrochina | Zhu J.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil Gas Fields | Zhu J.,Northwest University, China | And 7 more authors.
Geological Bulletin of China | Year: 2016

Based on data obtained from cast slice, mercury injection test, SEM, physical properties, and oil/water micro-displacement experiment, the authors made a thorough study of the petrological characteristics, porosity and permeability characteristics, pore structure characteristics, diagenesis and micro-anisotropy of Chang 6 reservoir in Wucangbu area, and analyzed the main influencing factors. The results show that the sedimentary environment of the Chang 6 thick sandstones reservoir is a delta front derived from the provenance in the northeast. In addition, the reservoir is characterized by medium compositional maturity and high textual maturity. The reservoir space includes residual intergranular pores, intergranular emposieu and intragranular emposieu. The sedimentary micro-facies and diagenesis constitute the main factors controlling the reservoir properties. The diagenetic period affecting reservoir development is stage A of middle diagenesis. The middle compaction, clay film cementation, residual intergranular pore diagenesis facies with weaker compaction and the secondary dissolution pore diagenesis facies are favorable diagenetic facies belts for reservoir development. Four oil displacement types are distinguished by studying reservoir microscopic heterogeneity, and the microscopic pore structures can more really reflect the reservoir's essential characteristics than the macroscopically physical properties. © 2016, Science Press. All right reserved. Source


Ran X.,Petrochina | Fu J.,Petrochina | Fu J.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil Gas Fields | Wei X.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil Gas Fields | And 7 more authors.
Petroleum Exploration and Development | Year: 2012

The control of structural evolution on the development of different types of Ordovician reservoirs in the Ordos Basin is discussed by studying the evolution of the Ordovician top boundary in geological times, and the mechanisms of formation and evolution of carbonate reservoirs are examined. The top boundary of the Ordovician is an important sequence boundary in the Ordos Basin. It represents not only the depositional change between lower marine carbonate rocks and upper clastic rocks, but also a depositional break caused by weathering and corrosion from the Late Calidonian to the Early Hercynian. It experienced three great structural changes in the geological history, which influenced the formation and conservation of the Ordovician reservoirs. Difference of lithology of the Ordovician top sequence between the east and west of the basin controlled the type of reservoir space and caused the formation of different reservoirs of corrosive pores. However, the later reversal of the sequence boundary causes the filling of early formed pore space in the eastern basin, and affects the space distribution of effective reservoirs. © 2012 Research Institute of Petroleum Exploration & Development, PetroChina. Source


Feng S.,Petrochina | Feng S.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil Gas Fields | Niu X.,Petrochina | Niu X.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil Gas Fields | And 6 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2013

The Chang7 tight oil reservoir in Ordos basin was tested by nuclear magnetic resonance (NMR). The results show that the pore size distribution of Chang7 tight oil reservoir is extremely wide, with big size pores, intermediate size pores, small pores, micro-pores and nano-pores all existed. The parameters, such as pore size, pore composition, principal pore type, are closely related to compactness of the reservoir. Almost all pores, from big size to nanometer size in tight oil reservoir contains oil, and the oil saturation in micro-pores and nano-pores are acceptably high. The identification of pore types in tight oil reservoir, especially micro-pores and nano-pores, and cognition of oil saturation in these pores have great significance to the exploration and development of tight oil resources in Ordos basin. Source


You Y.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil Gas Fields | You Y.,Petrochina | Niu X.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil Gas Fields | Niu X.,Petrochina | And 8 more authors.
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2014

The pore features of Chang7 tight oil reservoir, Yanchang layer, Ordos Basin, were studied using new pore measuring methods, such as FESEM, Micro-CT, QEMSCAN, MAPS, and were comprehensively analyzed combining conventional testing results. The results show that pores in tight oil reservoir are found continuously distributed from micro-to nano-scales. Pores being larger than 2 μm in radius constitute the primary reservoir storage space. The main types of pores are residual intergranular pores and dissolved pores. Different scale of pores and throats are well connected as a net, which works as effective flow channels for fluid. Fine-grained lake deposition and subsequent complex diagenesis characterized by strong compaction, strong cementation and strong solution, are the main reasons that micro-pores exist extensively in Chang7 tight oil reservoir. As the results of superior configuration relationships between the source and the formation and the high pressure injection condition, Chang7 tight oil reservoir is well saturated with oil. Source

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