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Role of Canal Lining on Groundwater Fluctuations: A Modeling Simulation Approach for Jaalwala distributary, Bahawalnagar

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Open Journal of Applied Sciences 2017年第5期7卷 213-232页

作者： Muhammad Hammad Atique Khan Muhammad Usman Saleem Sajid Rashid Ahmad Nasir Ahmad Shahid Jamil Sameeni Muhammad Akram Muhammad Farooq Institute of Geology University of the Punjab Lahore Pakistan Collage of Earth and Environmental Sciences University of the Punjab Lahore Pakistan Irrigation Department Government of Pakistan Lahore Pakistan

Jaalwala distributary was selected to see the consequences of concrete lining on the underlying saline groundwater table. Its middle and tail portions were concrete lined whereas the head portion was still unlined. Visual MODFLOW 2011.1 was used to simulate the effects of concrete lining on saline groundwater in two-dimensional format. Simulation results showed a gradual rise of electrical conductivity (EC) up to 7000 μS/cm and decline in water table depth to nine feet (2.74 m). It observed negligible inflows from the distributary through its western boundary due to formation of a permanent barrier in the way of seepage of any kind. Results have further predicted that freshwater layer available beneath the Jaalwala distributary (before its lining) will finish ultimately and the below present saline water also move upward to take this vacated place. Hence it was concluded to line the canals of saline water areas from their sides which will not only protect them from erosion but canal water theft as well.

关键词： Water Balance Jaalwala distributary Saline Water Intrusion Hydrostatic Pressure and Interface

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Lithofacies paleogeography mapping and reservoir prediction in tight sandstone strata: A case study from central Sichuan Basin, China

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Geoscience Frontiers 2017年第5期8卷 961-975页

作者： Yuan Zhong Lu Zhou Xiucheng Tan Chengbo Lian Hong Liu Jijia Liao Guang Hu Mingjie Liu Jian Cao State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu 610500 China Department of Earth Science and Technology Southwest Petroleum University Chengdu 610500 China School of Earth Sciences and Engineering Nanjing University Nanjing 210023 China

Sand-rich tight sandstone reservoirs are potential areas for oil and gas exploration. However, the high ratio of sandstone thickness to that of the strata in the formation poses many challenges and uncertainties to traditional lithofacies paleogeography mapping. Therefore, the prediction of reservoir sweet spots has remained problematic in the field of petroleum exploration. This study provides new insight into resolving this problem, based on the analyses of depositional characteristics of a typical modern sand-rich formation in a shallow braided river delta of the central Sichuan Basin, China. The varieties of sand-rich strata in the braided river delta environment include primary braided channels,secondary distributary channels and the distribution of sediments is controlled by the successive superposed strata deposited in paleogeomorphic valleys. The primary distributary channels have stronger hydrodynamic forces with higher proportions of coarse sand deposits than the secondary distributary channels. Therefore, lithofacies paleogeography mapping is controlled by the geomorphology, valley locations, and the migration of channels. We reconstructed the paleogeomorphology and valley systems that existed prior to the deposition of the Xujiahe Formation. Following this, rock-electro identification model for coarse skeletal sand bodies was constructed based on coring data. The results suggest that skeletal sand bodies in primary distributary channels occur mainly in the valleys and low-lying areas,whereas secondary distributary channels and fine deposits generally occur in the highland areas. The thickness distribution of skeletal sand bodies and lithofacies paleogeography map indicate a positive correlation in primary distributary channels and reservoir thickness. A significant correlation exists between different sedimentary facies and petrophysical properties. In addition, the degree of reservoir development in different sedimentary facies indicates that the mappin

关键词： Sand-rich strata Reservoir “sweet spot” Paleogeomorphology Primary distributary channel Lithofacies paleogeography

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